results and lessons from the operation of current beams
TRANSCRIPT
Results and Lessons from the Operation of Current Beams for Existing Neutrino Experiments
Edda Gschwendtner CERN
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
2
Outline
bull Overview of Operating Neutrino Beamsbull Results and Lessons from
ndash K2Kndash MiniBooNEndash NuMIndash CNGSndash T2K
bull Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
3
Other Talks on Experience with Operating Beams for Neutrino Experiments
bull Working Group 3 Session 7 Friday 4 July 2008
1 Horn Operational Experience in K2K MiniBooNE NuMI and CNGS
Ans Pardons
2 Radiation Protection LessonsHeinz Vincke
3 Delivering High Intensity Proton Beam Lessons for the Next Beam Generations
Sam Childress
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
4Overviewbull K2K (1999-2004)
νμ ντ oscillationltEνgt = 13GeV 250km baseline Results Δm2
23=(28 plusmn 04)x10-3eV2 sin2 2θ23=1 (90CL) PhysRevD74072003 2006
bull MiniBooNE (2002- )Tests LSND indication of νμ νe oscillationwith similar LE (500MeV500m)Results no evidence for νμ νe appearance PhysRevLett98 231801 2007
bull NuMI (2004- )νμ ντ disappearance oscillationltEνgt = ~4GeV 735km baselineResults Δm2
23=(243 plusmn 013)x10-3eV2 2 sin2 2θ23=1-005 PhysRevLett arXiv08062237 2008
bull CNGS (2006- )νμ ντ appearance oscillationltEνgt = 17GeV 735km baseline
bull T2K (2009- )νμ νe appearance (non-zero θ13) precise meas of νμ νx disappearance (θ23 Δm2
23 Δm213)
ltEνgt = 07GeV 25deg off-axis 295km baseline
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
5Conventional Neutrino Beams
vacuum
800m 100m 1000m 67m26m
p + C rarr (interactions) rarr π+ K+
rarr (decay in flight) rarr μ+ + νμ
Produce pions to make neutrinos
Componentsbull Proton beambull Production target
ndash Target length compromise between probability of protons to interact and produced particle scattering
ndash Target heating with many protons cooling neededbull Focusing system
ndash Horns with pulsed high currentndash Minimize material
bull Decay regionndash Length depends on energy of pions and if very long also muons decay νecontaminationndash Compromise between evacuating or filling with air or helium volume and window
thicknessesbull Absorber
ndash Collect protons not interactedndash Cooling needed
bull Beam instrumentationndash Pion muon detectorsndash Near detector flux and energy spectrum of neutrinos
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
6
K2K
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
7K2K Neutrino Beam Line
200m
12 GeV PSbull Cycle 22secbull Beam spill 11msbull ~6middot1012 protonsspill
Super Kamiokande 50kt water Cherenkov detector
νμ ντ oscillationltEνgt = 13GeV 250km baseline
ND 1kt Water CherenkovFD 50kt Superkamiokande
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
8
Iron
Concrete
Soil
BeamSK
Target amp 1st Horn
Transformer12
Top view
Stripline-1Stripline-2
17m
215
37m
2
15
Rail5-ton craneDecay Pipe
2nd Horn
K2K Secondary Beam Line
bull Target Al (66cm length 3cm diameter) part of horn1bull 2 horns water cooled 250kA 05 Hz 25ms pulse widthbull Pion monitor Cherenkov detectorbull Decay tube 200m He filledbull Beam dump 25m iron 2m concretebull Muon monitors ionization chamber silicon pad detectors
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
9
(includes Beam studies and tunings)Physics run From June 1999 to Nov 2004
K2K-IFrom June 1999 to July 2001Delivered POT 561 x 1019
Used for physics analysis 479 x 1019
K2K-IIFrom Dec 2002 to Nov 2004Delivered POT 488x1019
Used for physics analysis 443x1019
Total delivered POT (K2K I+II)1049 x 1020
Used for analysis 0922 x 1020
K2K Protons on Target
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
10
2004 ndash No exchange due to high radiationndash Nov 2004 Inner conductor of 1st horn
brokendash Radiation too high for replacement
00E+00
20E+06
40E+06
60E+06
80E+06
10E+07
12E+07
14E+07
99
01
99
05
99
09
00
01
00
05
00
09
01
01
01
05
01
09
02
01
02
05
02
09
03
01
03
05
03
09
04
01
04
05
04
09
05
01
Run1999
Run2000
H1-3-5φ25
H1-4φ30
H2-2
H2-1
H1-7φ30
H2-3
H1-3φ25
H1-2φ20
H1-6φ25
Parabolic disk
Run2001
H1-8φ30
H1-8φ
30
Run2002-03
Run2004
K2K Horn
LessonsIn-situ work reaches RP limit
Design with remote handling amp spare systems
Decouple target and hornDec 2004 end of runndash POT almost 1020 as scheduled
Strategy preventive exchange every yearIn total five 1st horns four 2nd horns Accessible no remote handling
horn pulses
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
11
MiniBooNE
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
12
MiniBooNE
Test LSND indication of νμ νe oscillationbull Keep LE same but different energy systematic errors
background add anti-neutrino capabilityndash Neutrino Energy MiniBooNE ~500MeV (LSND ~30MeV)ndash Baseline MiniBooNE ~500m (LSND ~30m)
bull MiniBooNE detector 800t pure mineral oilbull Operation since Nov 2002
Primary (protons) Secondary (mesons) Tertiary (neutrinos)
MiniBooNE Proton Beam Linebull 8 GeV proton beam from Booster
ndash 16 μs spillndash 5Hz rate ndash Maximum intensity 5middot1012 ppp
bull Beam on target σ lt 1mm
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
13
MiniBooNE Secondary Beam Line
bull Targetndash 7 Be slugs (71cm long 17 λ) cooled by air flow
bull Hornndash 170kA 140 μs 5 Hz average water cooled polarity change possible (~1-2 weeks)
bull Decay pipe ndash filled with air earth around can be cooled via air ducts and heat exchanger
bull 25 m absorber ndash INOUT movable provides systematic checks on νe contamination from μ decays
bull 50m absorberbull Little Muon counter (LMC)
ndash in situ measurement of Kaon background by counting muons produced from K decays
8 GeV Beamline
TargetHorn25m Absorber
(movable)50m Absorber
(fixed)
25m50m
(18m)
LMC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
14
MiniBooNE Statistics
2003 20052004 2006 2007 2008
Anti-neutrinos
26801 Million
11 E20
880703
Motivation for Anti-neutrino modendashContinue cross-section measurements ndashSearching for anti-neutrino disappearance
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
15
MiniBooNE Horn
bull Water leak and ground fault killed first horn at ~96 million pulses (detected ~end 2003 removed Oct 2004)
ndash Striplinehorn connection was corrodedndash Suspect is galvanic corrosion at bellows seal due to stagnant water around the spray
nozzlesbull New horn
Bottom water outlet bellows ndash Reduce number of material transitions by welding flanges ndash Avoid stagnant water by refitting with drain lines and new dehumidification system
Second horn already 187 million pulses
LessonsWe know how to design inner conductors to resist fatigue Concentrate on peripherals
Galvanic corrosion avoid trapped water foresee drainage choose material carefully
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
2
Outline
bull Overview of Operating Neutrino Beamsbull Results and Lessons from
ndash K2Kndash MiniBooNEndash NuMIndash CNGSndash T2K
bull Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
3
Other Talks on Experience with Operating Beams for Neutrino Experiments
bull Working Group 3 Session 7 Friday 4 July 2008
1 Horn Operational Experience in K2K MiniBooNE NuMI and CNGS
Ans Pardons
2 Radiation Protection LessonsHeinz Vincke
3 Delivering High Intensity Proton Beam Lessons for the Next Beam Generations
Sam Childress
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
4Overviewbull K2K (1999-2004)
νμ ντ oscillationltEνgt = 13GeV 250km baseline Results Δm2
23=(28 plusmn 04)x10-3eV2 sin2 2θ23=1 (90CL) PhysRevD74072003 2006
bull MiniBooNE (2002- )Tests LSND indication of νμ νe oscillationwith similar LE (500MeV500m)Results no evidence for νμ νe appearance PhysRevLett98 231801 2007
bull NuMI (2004- )νμ ντ disappearance oscillationltEνgt = ~4GeV 735km baselineResults Δm2
23=(243 plusmn 013)x10-3eV2 2 sin2 2θ23=1-005 PhysRevLett arXiv08062237 2008
bull CNGS (2006- )νμ ντ appearance oscillationltEνgt = 17GeV 735km baseline
bull T2K (2009- )νμ νe appearance (non-zero θ13) precise meas of νμ νx disappearance (θ23 Δm2
23 Δm213)
ltEνgt = 07GeV 25deg off-axis 295km baseline
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
5Conventional Neutrino Beams
vacuum
800m 100m 1000m 67m26m
p + C rarr (interactions) rarr π+ K+
rarr (decay in flight) rarr μ+ + νμ
Produce pions to make neutrinos
Componentsbull Proton beambull Production target
ndash Target length compromise between probability of protons to interact and produced particle scattering
ndash Target heating with many protons cooling neededbull Focusing system
ndash Horns with pulsed high currentndash Minimize material
bull Decay regionndash Length depends on energy of pions and if very long also muons decay νecontaminationndash Compromise between evacuating or filling with air or helium volume and window
thicknessesbull Absorber
ndash Collect protons not interactedndash Cooling needed
bull Beam instrumentationndash Pion muon detectorsndash Near detector flux and energy spectrum of neutrinos
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
6
K2K
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
7K2K Neutrino Beam Line
200m
12 GeV PSbull Cycle 22secbull Beam spill 11msbull ~6middot1012 protonsspill
Super Kamiokande 50kt water Cherenkov detector
νμ ντ oscillationltEνgt = 13GeV 250km baseline
ND 1kt Water CherenkovFD 50kt Superkamiokande
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
8
Iron
Concrete
Soil
BeamSK
Target amp 1st Horn
Transformer12
Top view
Stripline-1Stripline-2
17m
215
37m
2
15
Rail5-ton craneDecay Pipe
2nd Horn
K2K Secondary Beam Line
bull Target Al (66cm length 3cm diameter) part of horn1bull 2 horns water cooled 250kA 05 Hz 25ms pulse widthbull Pion monitor Cherenkov detectorbull Decay tube 200m He filledbull Beam dump 25m iron 2m concretebull Muon monitors ionization chamber silicon pad detectors
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
9
(includes Beam studies and tunings)Physics run From June 1999 to Nov 2004
K2K-IFrom June 1999 to July 2001Delivered POT 561 x 1019
Used for physics analysis 479 x 1019
K2K-IIFrom Dec 2002 to Nov 2004Delivered POT 488x1019
Used for physics analysis 443x1019
Total delivered POT (K2K I+II)1049 x 1020
Used for analysis 0922 x 1020
K2K Protons on Target
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
10
2004 ndash No exchange due to high radiationndash Nov 2004 Inner conductor of 1st horn
brokendash Radiation too high for replacement
00E+00
20E+06
40E+06
60E+06
80E+06
10E+07
12E+07
14E+07
99
01
99
05
99
09
00
01
00
05
00
09
01
01
01
05
01
09
02
01
02
05
02
09
03
01
03
05
03
09
04
01
04
05
04
09
05
01
Run1999
Run2000
H1-3-5φ25
H1-4φ30
H2-2
H2-1
H1-7φ30
H2-3
H1-3φ25
H1-2φ20
H1-6φ25
Parabolic disk
Run2001
H1-8φ30
H1-8φ
30
Run2002-03
Run2004
K2K Horn
LessonsIn-situ work reaches RP limit
Design with remote handling amp spare systems
Decouple target and hornDec 2004 end of runndash POT almost 1020 as scheduled
Strategy preventive exchange every yearIn total five 1st horns four 2nd horns Accessible no remote handling
horn pulses
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
11
MiniBooNE
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
12
MiniBooNE
Test LSND indication of νμ νe oscillationbull Keep LE same but different energy systematic errors
background add anti-neutrino capabilityndash Neutrino Energy MiniBooNE ~500MeV (LSND ~30MeV)ndash Baseline MiniBooNE ~500m (LSND ~30m)
bull MiniBooNE detector 800t pure mineral oilbull Operation since Nov 2002
Primary (protons) Secondary (mesons) Tertiary (neutrinos)
MiniBooNE Proton Beam Linebull 8 GeV proton beam from Booster
ndash 16 μs spillndash 5Hz rate ndash Maximum intensity 5middot1012 ppp
bull Beam on target σ lt 1mm
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
13
MiniBooNE Secondary Beam Line
bull Targetndash 7 Be slugs (71cm long 17 λ) cooled by air flow
bull Hornndash 170kA 140 μs 5 Hz average water cooled polarity change possible (~1-2 weeks)
bull Decay pipe ndash filled with air earth around can be cooled via air ducts and heat exchanger
bull 25 m absorber ndash INOUT movable provides systematic checks on νe contamination from μ decays
bull 50m absorberbull Little Muon counter (LMC)
ndash in situ measurement of Kaon background by counting muons produced from K decays
8 GeV Beamline
TargetHorn25m Absorber
(movable)50m Absorber
(fixed)
25m50m
(18m)
LMC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
14
MiniBooNE Statistics
2003 20052004 2006 2007 2008
Anti-neutrinos
26801 Million
11 E20
880703
Motivation for Anti-neutrino modendashContinue cross-section measurements ndashSearching for anti-neutrino disappearance
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
15
MiniBooNE Horn
bull Water leak and ground fault killed first horn at ~96 million pulses (detected ~end 2003 removed Oct 2004)
ndash Striplinehorn connection was corrodedndash Suspect is galvanic corrosion at bellows seal due to stagnant water around the spray
nozzlesbull New horn
Bottom water outlet bellows ndash Reduce number of material transitions by welding flanges ndash Avoid stagnant water by refitting with drain lines and new dehumidification system
Second horn already 187 million pulses
LessonsWe know how to design inner conductors to resist fatigue Concentrate on peripherals
Galvanic corrosion avoid trapped water foresee drainage choose material carefully
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
3
Other Talks on Experience with Operating Beams for Neutrino Experiments
bull Working Group 3 Session 7 Friday 4 July 2008
1 Horn Operational Experience in K2K MiniBooNE NuMI and CNGS
Ans Pardons
2 Radiation Protection LessonsHeinz Vincke
3 Delivering High Intensity Proton Beam Lessons for the Next Beam Generations
Sam Childress
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
4Overviewbull K2K (1999-2004)
νμ ντ oscillationltEνgt = 13GeV 250km baseline Results Δm2
23=(28 plusmn 04)x10-3eV2 sin2 2θ23=1 (90CL) PhysRevD74072003 2006
bull MiniBooNE (2002- )Tests LSND indication of νμ νe oscillationwith similar LE (500MeV500m)Results no evidence for νμ νe appearance PhysRevLett98 231801 2007
bull NuMI (2004- )νμ ντ disappearance oscillationltEνgt = ~4GeV 735km baselineResults Δm2
23=(243 plusmn 013)x10-3eV2 2 sin2 2θ23=1-005 PhysRevLett arXiv08062237 2008
bull CNGS (2006- )νμ ντ appearance oscillationltEνgt = 17GeV 735km baseline
bull T2K (2009- )νμ νe appearance (non-zero θ13) precise meas of νμ νx disappearance (θ23 Δm2
23 Δm213)
ltEνgt = 07GeV 25deg off-axis 295km baseline
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
5Conventional Neutrino Beams
vacuum
800m 100m 1000m 67m26m
p + C rarr (interactions) rarr π+ K+
rarr (decay in flight) rarr μ+ + νμ
Produce pions to make neutrinos
Componentsbull Proton beambull Production target
ndash Target length compromise between probability of protons to interact and produced particle scattering
ndash Target heating with many protons cooling neededbull Focusing system
ndash Horns with pulsed high currentndash Minimize material
bull Decay regionndash Length depends on energy of pions and if very long also muons decay νecontaminationndash Compromise between evacuating or filling with air or helium volume and window
thicknessesbull Absorber
ndash Collect protons not interactedndash Cooling needed
bull Beam instrumentationndash Pion muon detectorsndash Near detector flux and energy spectrum of neutrinos
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
6
K2K
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
7K2K Neutrino Beam Line
200m
12 GeV PSbull Cycle 22secbull Beam spill 11msbull ~6middot1012 protonsspill
Super Kamiokande 50kt water Cherenkov detector
νμ ντ oscillationltEνgt = 13GeV 250km baseline
ND 1kt Water CherenkovFD 50kt Superkamiokande
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
8
Iron
Concrete
Soil
BeamSK
Target amp 1st Horn
Transformer12
Top view
Stripline-1Stripline-2
17m
215
37m
2
15
Rail5-ton craneDecay Pipe
2nd Horn
K2K Secondary Beam Line
bull Target Al (66cm length 3cm diameter) part of horn1bull 2 horns water cooled 250kA 05 Hz 25ms pulse widthbull Pion monitor Cherenkov detectorbull Decay tube 200m He filledbull Beam dump 25m iron 2m concretebull Muon monitors ionization chamber silicon pad detectors
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
9
(includes Beam studies and tunings)Physics run From June 1999 to Nov 2004
K2K-IFrom June 1999 to July 2001Delivered POT 561 x 1019
Used for physics analysis 479 x 1019
K2K-IIFrom Dec 2002 to Nov 2004Delivered POT 488x1019
Used for physics analysis 443x1019
Total delivered POT (K2K I+II)1049 x 1020
Used for analysis 0922 x 1020
K2K Protons on Target
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
10
2004 ndash No exchange due to high radiationndash Nov 2004 Inner conductor of 1st horn
brokendash Radiation too high for replacement
00E+00
20E+06
40E+06
60E+06
80E+06
10E+07
12E+07
14E+07
99
01
99
05
99
09
00
01
00
05
00
09
01
01
01
05
01
09
02
01
02
05
02
09
03
01
03
05
03
09
04
01
04
05
04
09
05
01
Run1999
Run2000
H1-3-5φ25
H1-4φ30
H2-2
H2-1
H1-7φ30
H2-3
H1-3φ25
H1-2φ20
H1-6φ25
Parabolic disk
Run2001
H1-8φ30
H1-8φ
30
Run2002-03
Run2004
K2K Horn
LessonsIn-situ work reaches RP limit
Design with remote handling amp spare systems
Decouple target and hornDec 2004 end of runndash POT almost 1020 as scheduled
Strategy preventive exchange every yearIn total five 1st horns four 2nd horns Accessible no remote handling
horn pulses
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
11
MiniBooNE
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
12
MiniBooNE
Test LSND indication of νμ νe oscillationbull Keep LE same but different energy systematic errors
background add anti-neutrino capabilityndash Neutrino Energy MiniBooNE ~500MeV (LSND ~30MeV)ndash Baseline MiniBooNE ~500m (LSND ~30m)
bull MiniBooNE detector 800t pure mineral oilbull Operation since Nov 2002
Primary (protons) Secondary (mesons) Tertiary (neutrinos)
MiniBooNE Proton Beam Linebull 8 GeV proton beam from Booster
ndash 16 μs spillndash 5Hz rate ndash Maximum intensity 5middot1012 ppp
bull Beam on target σ lt 1mm
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
13
MiniBooNE Secondary Beam Line
bull Targetndash 7 Be slugs (71cm long 17 λ) cooled by air flow
bull Hornndash 170kA 140 μs 5 Hz average water cooled polarity change possible (~1-2 weeks)
bull Decay pipe ndash filled with air earth around can be cooled via air ducts and heat exchanger
bull 25 m absorber ndash INOUT movable provides systematic checks on νe contamination from μ decays
bull 50m absorberbull Little Muon counter (LMC)
ndash in situ measurement of Kaon background by counting muons produced from K decays
8 GeV Beamline
TargetHorn25m Absorber
(movable)50m Absorber
(fixed)
25m50m
(18m)
LMC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
14
MiniBooNE Statistics
2003 20052004 2006 2007 2008
Anti-neutrinos
26801 Million
11 E20
880703
Motivation for Anti-neutrino modendashContinue cross-section measurements ndashSearching for anti-neutrino disappearance
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
15
MiniBooNE Horn
bull Water leak and ground fault killed first horn at ~96 million pulses (detected ~end 2003 removed Oct 2004)
ndash Striplinehorn connection was corrodedndash Suspect is galvanic corrosion at bellows seal due to stagnant water around the spray
nozzlesbull New horn
Bottom water outlet bellows ndash Reduce number of material transitions by welding flanges ndash Avoid stagnant water by refitting with drain lines and new dehumidification system
Second horn already 187 million pulses
LessonsWe know how to design inner conductors to resist fatigue Concentrate on peripherals
Galvanic corrosion avoid trapped water foresee drainage choose material carefully
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
4Overviewbull K2K (1999-2004)
νμ ντ oscillationltEνgt = 13GeV 250km baseline Results Δm2
23=(28 plusmn 04)x10-3eV2 sin2 2θ23=1 (90CL) PhysRevD74072003 2006
bull MiniBooNE (2002- )Tests LSND indication of νμ νe oscillationwith similar LE (500MeV500m)Results no evidence for νμ νe appearance PhysRevLett98 231801 2007
bull NuMI (2004- )νμ ντ disappearance oscillationltEνgt = ~4GeV 735km baselineResults Δm2
23=(243 plusmn 013)x10-3eV2 2 sin2 2θ23=1-005 PhysRevLett arXiv08062237 2008
bull CNGS (2006- )νμ ντ appearance oscillationltEνgt = 17GeV 735km baseline
bull T2K (2009- )νμ νe appearance (non-zero θ13) precise meas of νμ νx disappearance (θ23 Δm2
23 Δm213)
ltEνgt = 07GeV 25deg off-axis 295km baseline
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
5Conventional Neutrino Beams
vacuum
800m 100m 1000m 67m26m
p + C rarr (interactions) rarr π+ K+
rarr (decay in flight) rarr μ+ + νμ
Produce pions to make neutrinos
Componentsbull Proton beambull Production target
ndash Target length compromise between probability of protons to interact and produced particle scattering
ndash Target heating with many protons cooling neededbull Focusing system
ndash Horns with pulsed high currentndash Minimize material
bull Decay regionndash Length depends on energy of pions and if very long also muons decay νecontaminationndash Compromise between evacuating or filling with air or helium volume and window
thicknessesbull Absorber
ndash Collect protons not interactedndash Cooling needed
bull Beam instrumentationndash Pion muon detectorsndash Near detector flux and energy spectrum of neutrinos
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
6
K2K
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
7K2K Neutrino Beam Line
200m
12 GeV PSbull Cycle 22secbull Beam spill 11msbull ~6middot1012 protonsspill
Super Kamiokande 50kt water Cherenkov detector
νμ ντ oscillationltEνgt = 13GeV 250km baseline
ND 1kt Water CherenkovFD 50kt Superkamiokande
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
8
Iron
Concrete
Soil
BeamSK
Target amp 1st Horn
Transformer12
Top view
Stripline-1Stripline-2
17m
215
37m
2
15
Rail5-ton craneDecay Pipe
2nd Horn
K2K Secondary Beam Line
bull Target Al (66cm length 3cm diameter) part of horn1bull 2 horns water cooled 250kA 05 Hz 25ms pulse widthbull Pion monitor Cherenkov detectorbull Decay tube 200m He filledbull Beam dump 25m iron 2m concretebull Muon monitors ionization chamber silicon pad detectors
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
9
(includes Beam studies and tunings)Physics run From June 1999 to Nov 2004
K2K-IFrom June 1999 to July 2001Delivered POT 561 x 1019
Used for physics analysis 479 x 1019
K2K-IIFrom Dec 2002 to Nov 2004Delivered POT 488x1019
Used for physics analysis 443x1019
Total delivered POT (K2K I+II)1049 x 1020
Used for analysis 0922 x 1020
K2K Protons on Target
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
10
2004 ndash No exchange due to high radiationndash Nov 2004 Inner conductor of 1st horn
brokendash Radiation too high for replacement
00E+00
20E+06
40E+06
60E+06
80E+06
10E+07
12E+07
14E+07
99
01
99
05
99
09
00
01
00
05
00
09
01
01
01
05
01
09
02
01
02
05
02
09
03
01
03
05
03
09
04
01
04
05
04
09
05
01
Run1999
Run2000
H1-3-5φ25
H1-4φ30
H2-2
H2-1
H1-7φ30
H2-3
H1-3φ25
H1-2φ20
H1-6φ25
Parabolic disk
Run2001
H1-8φ30
H1-8φ
30
Run2002-03
Run2004
K2K Horn
LessonsIn-situ work reaches RP limit
Design with remote handling amp spare systems
Decouple target and hornDec 2004 end of runndash POT almost 1020 as scheduled
Strategy preventive exchange every yearIn total five 1st horns four 2nd horns Accessible no remote handling
horn pulses
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
11
MiniBooNE
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
12
MiniBooNE
Test LSND indication of νμ νe oscillationbull Keep LE same but different energy systematic errors
background add anti-neutrino capabilityndash Neutrino Energy MiniBooNE ~500MeV (LSND ~30MeV)ndash Baseline MiniBooNE ~500m (LSND ~30m)
bull MiniBooNE detector 800t pure mineral oilbull Operation since Nov 2002
Primary (protons) Secondary (mesons) Tertiary (neutrinos)
MiniBooNE Proton Beam Linebull 8 GeV proton beam from Booster
ndash 16 μs spillndash 5Hz rate ndash Maximum intensity 5middot1012 ppp
bull Beam on target σ lt 1mm
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
13
MiniBooNE Secondary Beam Line
bull Targetndash 7 Be slugs (71cm long 17 λ) cooled by air flow
bull Hornndash 170kA 140 μs 5 Hz average water cooled polarity change possible (~1-2 weeks)
bull Decay pipe ndash filled with air earth around can be cooled via air ducts and heat exchanger
bull 25 m absorber ndash INOUT movable provides systematic checks on νe contamination from μ decays
bull 50m absorberbull Little Muon counter (LMC)
ndash in situ measurement of Kaon background by counting muons produced from K decays
8 GeV Beamline
TargetHorn25m Absorber
(movable)50m Absorber
(fixed)
25m50m
(18m)
LMC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
14
MiniBooNE Statistics
2003 20052004 2006 2007 2008
Anti-neutrinos
26801 Million
11 E20
880703
Motivation for Anti-neutrino modendashContinue cross-section measurements ndashSearching for anti-neutrino disappearance
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
15
MiniBooNE Horn
bull Water leak and ground fault killed first horn at ~96 million pulses (detected ~end 2003 removed Oct 2004)
ndash Striplinehorn connection was corrodedndash Suspect is galvanic corrosion at bellows seal due to stagnant water around the spray
nozzlesbull New horn
Bottom water outlet bellows ndash Reduce number of material transitions by welding flanges ndash Avoid stagnant water by refitting with drain lines and new dehumidification system
Second horn already 187 million pulses
LessonsWe know how to design inner conductors to resist fatigue Concentrate on peripherals
Galvanic corrosion avoid trapped water foresee drainage choose material carefully
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
5Conventional Neutrino Beams
vacuum
800m 100m 1000m 67m26m
p + C rarr (interactions) rarr π+ K+
rarr (decay in flight) rarr μ+ + νμ
Produce pions to make neutrinos
Componentsbull Proton beambull Production target
ndash Target length compromise between probability of protons to interact and produced particle scattering
ndash Target heating with many protons cooling neededbull Focusing system
ndash Horns with pulsed high currentndash Minimize material
bull Decay regionndash Length depends on energy of pions and if very long also muons decay νecontaminationndash Compromise between evacuating or filling with air or helium volume and window
thicknessesbull Absorber
ndash Collect protons not interactedndash Cooling needed
bull Beam instrumentationndash Pion muon detectorsndash Near detector flux and energy spectrum of neutrinos
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
6
K2K
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
7K2K Neutrino Beam Line
200m
12 GeV PSbull Cycle 22secbull Beam spill 11msbull ~6middot1012 protonsspill
Super Kamiokande 50kt water Cherenkov detector
νμ ντ oscillationltEνgt = 13GeV 250km baseline
ND 1kt Water CherenkovFD 50kt Superkamiokande
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
8
Iron
Concrete
Soil
BeamSK
Target amp 1st Horn
Transformer12
Top view
Stripline-1Stripline-2
17m
215
37m
2
15
Rail5-ton craneDecay Pipe
2nd Horn
K2K Secondary Beam Line
bull Target Al (66cm length 3cm diameter) part of horn1bull 2 horns water cooled 250kA 05 Hz 25ms pulse widthbull Pion monitor Cherenkov detectorbull Decay tube 200m He filledbull Beam dump 25m iron 2m concretebull Muon monitors ionization chamber silicon pad detectors
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
9
(includes Beam studies and tunings)Physics run From June 1999 to Nov 2004
K2K-IFrom June 1999 to July 2001Delivered POT 561 x 1019
Used for physics analysis 479 x 1019
K2K-IIFrom Dec 2002 to Nov 2004Delivered POT 488x1019
Used for physics analysis 443x1019
Total delivered POT (K2K I+II)1049 x 1020
Used for analysis 0922 x 1020
K2K Protons on Target
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
10
2004 ndash No exchange due to high radiationndash Nov 2004 Inner conductor of 1st horn
brokendash Radiation too high for replacement
00E+00
20E+06
40E+06
60E+06
80E+06
10E+07
12E+07
14E+07
99
01
99
05
99
09
00
01
00
05
00
09
01
01
01
05
01
09
02
01
02
05
02
09
03
01
03
05
03
09
04
01
04
05
04
09
05
01
Run1999
Run2000
H1-3-5φ25
H1-4φ30
H2-2
H2-1
H1-7φ30
H2-3
H1-3φ25
H1-2φ20
H1-6φ25
Parabolic disk
Run2001
H1-8φ30
H1-8φ
30
Run2002-03
Run2004
K2K Horn
LessonsIn-situ work reaches RP limit
Design with remote handling amp spare systems
Decouple target and hornDec 2004 end of runndash POT almost 1020 as scheduled
Strategy preventive exchange every yearIn total five 1st horns four 2nd horns Accessible no remote handling
horn pulses
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
11
MiniBooNE
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
12
MiniBooNE
Test LSND indication of νμ νe oscillationbull Keep LE same but different energy systematic errors
background add anti-neutrino capabilityndash Neutrino Energy MiniBooNE ~500MeV (LSND ~30MeV)ndash Baseline MiniBooNE ~500m (LSND ~30m)
bull MiniBooNE detector 800t pure mineral oilbull Operation since Nov 2002
Primary (protons) Secondary (mesons) Tertiary (neutrinos)
MiniBooNE Proton Beam Linebull 8 GeV proton beam from Booster
ndash 16 μs spillndash 5Hz rate ndash Maximum intensity 5middot1012 ppp
bull Beam on target σ lt 1mm
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
13
MiniBooNE Secondary Beam Line
bull Targetndash 7 Be slugs (71cm long 17 λ) cooled by air flow
bull Hornndash 170kA 140 μs 5 Hz average water cooled polarity change possible (~1-2 weeks)
bull Decay pipe ndash filled with air earth around can be cooled via air ducts and heat exchanger
bull 25 m absorber ndash INOUT movable provides systematic checks on νe contamination from μ decays
bull 50m absorberbull Little Muon counter (LMC)
ndash in situ measurement of Kaon background by counting muons produced from K decays
8 GeV Beamline
TargetHorn25m Absorber
(movable)50m Absorber
(fixed)
25m50m
(18m)
LMC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
14
MiniBooNE Statistics
2003 20052004 2006 2007 2008
Anti-neutrinos
26801 Million
11 E20
880703
Motivation for Anti-neutrino modendashContinue cross-section measurements ndashSearching for anti-neutrino disappearance
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
15
MiniBooNE Horn
bull Water leak and ground fault killed first horn at ~96 million pulses (detected ~end 2003 removed Oct 2004)
ndash Striplinehorn connection was corrodedndash Suspect is galvanic corrosion at bellows seal due to stagnant water around the spray
nozzlesbull New horn
Bottom water outlet bellows ndash Reduce number of material transitions by welding flanges ndash Avoid stagnant water by refitting with drain lines and new dehumidification system
Second horn already 187 million pulses
LessonsWe know how to design inner conductors to resist fatigue Concentrate on peripherals
Galvanic corrosion avoid trapped water foresee drainage choose material carefully
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
6
K2K
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
7K2K Neutrino Beam Line
200m
12 GeV PSbull Cycle 22secbull Beam spill 11msbull ~6middot1012 protonsspill
Super Kamiokande 50kt water Cherenkov detector
νμ ντ oscillationltEνgt = 13GeV 250km baseline
ND 1kt Water CherenkovFD 50kt Superkamiokande
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
8
Iron
Concrete
Soil
BeamSK
Target amp 1st Horn
Transformer12
Top view
Stripline-1Stripline-2
17m
215
37m
2
15
Rail5-ton craneDecay Pipe
2nd Horn
K2K Secondary Beam Line
bull Target Al (66cm length 3cm diameter) part of horn1bull 2 horns water cooled 250kA 05 Hz 25ms pulse widthbull Pion monitor Cherenkov detectorbull Decay tube 200m He filledbull Beam dump 25m iron 2m concretebull Muon monitors ionization chamber silicon pad detectors
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
9
(includes Beam studies and tunings)Physics run From June 1999 to Nov 2004
K2K-IFrom June 1999 to July 2001Delivered POT 561 x 1019
Used for physics analysis 479 x 1019
K2K-IIFrom Dec 2002 to Nov 2004Delivered POT 488x1019
Used for physics analysis 443x1019
Total delivered POT (K2K I+II)1049 x 1020
Used for analysis 0922 x 1020
K2K Protons on Target
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
10
2004 ndash No exchange due to high radiationndash Nov 2004 Inner conductor of 1st horn
brokendash Radiation too high for replacement
00E+00
20E+06
40E+06
60E+06
80E+06
10E+07
12E+07
14E+07
99
01
99
05
99
09
00
01
00
05
00
09
01
01
01
05
01
09
02
01
02
05
02
09
03
01
03
05
03
09
04
01
04
05
04
09
05
01
Run1999
Run2000
H1-3-5φ25
H1-4φ30
H2-2
H2-1
H1-7φ30
H2-3
H1-3φ25
H1-2φ20
H1-6φ25
Parabolic disk
Run2001
H1-8φ30
H1-8φ
30
Run2002-03
Run2004
K2K Horn
LessonsIn-situ work reaches RP limit
Design with remote handling amp spare systems
Decouple target and hornDec 2004 end of runndash POT almost 1020 as scheduled
Strategy preventive exchange every yearIn total five 1st horns four 2nd horns Accessible no remote handling
horn pulses
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
11
MiniBooNE
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
12
MiniBooNE
Test LSND indication of νμ νe oscillationbull Keep LE same but different energy systematic errors
background add anti-neutrino capabilityndash Neutrino Energy MiniBooNE ~500MeV (LSND ~30MeV)ndash Baseline MiniBooNE ~500m (LSND ~30m)
bull MiniBooNE detector 800t pure mineral oilbull Operation since Nov 2002
Primary (protons) Secondary (mesons) Tertiary (neutrinos)
MiniBooNE Proton Beam Linebull 8 GeV proton beam from Booster
ndash 16 μs spillndash 5Hz rate ndash Maximum intensity 5middot1012 ppp
bull Beam on target σ lt 1mm
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
13
MiniBooNE Secondary Beam Line
bull Targetndash 7 Be slugs (71cm long 17 λ) cooled by air flow
bull Hornndash 170kA 140 μs 5 Hz average water cooled polarity change possible (~1-2 weeks)
bull Decay pipe ndash filled with air earth around can be cooled via air ducts and heat exchanger
bull 25 m absorber ndash INOUT movable provides systematic checks on νe contamination from μ decays
bull 50m absorberbull Little Muon counter (LMC)
ndash in situ measurement of Kaon background by counting muons produced from K decays
8 GeV Beamline
TargetHorn25m Absorber
(movable)50m Absorber
(fixed)
25m50m
(18m)
LMC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
14
MiniBooNE Statistics
2003 20052004 2006 2007 2008
Anti-neutrinos
26801 Million
11 E20
880703
Motivation for Anti-neutrino modendashContinue cross-section measurements ndashSearching for anti-neutrino disappearance
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
15
MiniBooNE Horn
bull Water leak and ground fault killed first horn at ~96 million pulses (detected ~end 2003 removed Oct 2004)
ndash Striplinehorn connection was corrodedndash Suspect is galvanic corrosion at bellows seal due to stagnant water around the spray
nozzlesbull New horn
Bottom water outlet bellows ndash Reduce number of material transitions by welding flanges ndash Avoid stagnant water by refitting with drain lines and new dehumidification system
Second horn already 187 million pulses
LessonsWe know how to design inner conductors to resist fatigue Concentrate on peripherals
Galvanic corrosion avoid trapped water foresee drainage choose material carefully
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
7K2K Neutrino Beam Line
200m
12 GeV PSbull Cycle 22secbull Beam spill 11msbull ~6middot1012 protonsspill
Super Kamiokande 50kt water Cherenkov detector
νμ ντ oscillationltEνgt = 13GeV 250km baseline
ND 1kt Water CherenkovFD 50kt Superkamiokande
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
8
Iron
Concrete
Soil
BeamSK
Target amp 1st Horn
Transformer12
Top view
Stripline-1Stripline-2
17m
215
37m
2
15
Rail5-ton craneDecay Pipe
2nd Horn
K2K Secondary Beam Line
bull Target Al (66cm length 3cm diameter) part of horn1bull 2 horns water cooled 250kA 05 Hz 25ms pulse widthbull Pion monitor Cherenkov detectorbull Decay tube 200m He filledbull Beam dump 25m iron 2m concretebull Muon monitors ionization chamber silicon pad detectors
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
9
(includes Beam studies and tunings)Physics run From June 1999 to Nov 2004
K2K-IFrom June 1999 to July 2001Delivered POT 561 x 1019
Used for physics analysis 479 x 1019
K2K-IIFrom Dec 2002 to Nov 2004Delivered POT 488x1019
Used for physics analysis 443x1019
Total delivered POT (K2K I+II)1049 x 1020
Used for analysis 0922 x 1020
K2K Protons on Target
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
10
2004 ndash No exchange due to high radiationndash Nov 2004 Inner conductor of 1st horn
brokendash Radiation too high for replacement
00E+00
20E+06
40E+06
60E+06
80E+06
10E+07
12E+07
14E+07
99
01
99
05
99
09
00
01
00
05
00
09
01
01
01
05
01
09
02
01
02
05
02
09
03
01
03
05
03
09
04
01
04
05
04
09
05
01
Run1999
Run2000
H1-3-5φ25
H1-4φ30
H2-2
H2-1
H1-7φ30
H2-3
H1-3φ25
H1-2φ20
H1-6φ25
Parabolic disk
Run2001
H1-8φ30
H1-8φ
30
Run2002-03
Run2004
K2K Horn
LessonsIn-situ work reaches RP limit
Design with remote handling amp spare systems
Decouple target and hornDec 2004 end of runndash POT almost 1020 as scheduled
Strategy preventive exchange every yearIn total five 1st horns four 2nd horns Accessible no remote handling
horn pulses
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
11
MiniBooNE
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
12
MiniBooNE
Test LSND indication of νμ νe oscillationbull Keep LE same but different energy systematic errors
background add anti-neutrino capabilityndash Neutrino Energy MiniBooNE ~500MeV (LSND ~30MeV)ndash Baseline MiniBooNE ~500m (LSND ~30m)
bull MiniBooNE detector 800t pure mineral oilbull Operation since Nov 2002
Primary (protons) Secondary (mesons) Tertiary (neutrinos)
MiniBooNE Proton Beam Linebull 8 GeV proton beam from Booster
ndash 16 μs spillndash 5Hz rate ndash Maximum intensity 5middot1012 ppp
bull Beam on target σ lt 1mm
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
13
MiniBooNE Secondary Beam Line
bull Targetndash 7 Be slugs (71cm long 17 λ) cooled by air flow
bull Hornndash 170kA 140 μs 5 Hz average water cooled polarity change possible (~1-2 weeks)
bull Decay pipe ndash filled with air earth around can be cooled via air ducts and heat exchanger
bull 25 m absorber ndash INOUT movable provides systematic checks on νe contamination from μ decays
bull 50m absorberbull Little Muon counter (LMC)
ndash in situ measurement of Kaon background by counting muons produced from K decays
8 GeV Beamline
TargetHorn25m Absorber
(movable)50m Absorber
(fixed)
25m50m
(18m)
LMC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
14
MiniBooNE Statistics
2003 20052004 2006 2007 2008
Anti-neutrinos
26801 Million
11 E20
880703
Motivation for Anti-neutrino modendashContinue cross-section measurements ndashSearching for anti-neutrino disappearance
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
15
MiniBooNE Horn
bull Water leak and ground fault killed first horn at ~96 million pulses (detected ~end 2003 removed Oct 2004)
ndash Striplinehorn connection was corrodedndash Suspect is galvanic corrosion at bellows seal due to stagnant water around the spray
nozzlesbull New horn
Bottom water outlet bellows ndash Reduce number of material transitions by welding flanges ndash Avoid stagnant water by refitting with drain lines and new dehumidification system
Second horn already 187 million pulses
LessonsWe know how to design inner conductors to resist fatigue Concentrate on peripherals
Galvanic corrosion avoid trapped water foresee drainage choose material carefully
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
8
Iron
Concrete
Soil
BeamSK
Target amp 1st Horn
Transformer12
Top view
Stripline-1Stripline-2
17m
215
37m
2
15
Rail5-ton craneDecay Pipe
2nd Horn
K2K Secondary Beam Line
bull Target Al (66cm length 3cm diameter) part of horn1bull 2 horns water cooled 250kA 05 Hz 25ms pulse widthbull Pion monitor Cherenkov detectorbull Decay tube 200m He filledbull Beam dump 25m iron 2m concretebull Muon monitors ionization chamber silicon pad detectors
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
9
(includes Beam studies and tunings)Physics run From June 1999 to Nov 2004
K2K-IFrom June 1999 to July 2001Delivered POT 561 x 1019
Used for physics analysis 479 x 1019
K2K-IIFrom Dec 2002 to Nov 2004Delivered POT 488x1019
Used for physics analysis 443x1019
Total delivered POT (K2K I+II)1049 x 1020
Used for analysis 0922 x 1020
K2K Protons on Target
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
10
2004 ndash No exchange due to high radiationndash Nov 2004 Inner conductor of 1st horn
brokendash Radiation too high for replacement
00E+00
20E+06
40E+06
60E+06
80E+06
10E+07
12E+07
14E+07
99
01
99
05
99
09
00
01
00
05
00
09
01
01
01
05
01
09
02
01
02
05
02
09
03
01
03
05
03
09
04
01
04
05
04
09
05
01
Run1999
Run2000
H1-3-5φ25
H1-4φ30
H2-2
H2-1
H1-7φ30
H2-3
H1-3φ25
H1-2φ20
H1-6φ25
Parabolic disk
Run2001
H1-8φ30
H1-8φ
30
Run2002-03
Run2004
K2K Horn
LessonsIn-situ work reaches RP limit
Design with remote handling amp spare systems
Decouple target and hornDec 2004 end of runndash POT almost 1020 as scheduled
Strategy preventive exchange every yearIn total five 1st horns four 2nd horns Accessible no remote handling
horn pulses
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
11
MiniBooNE
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
12
MiniBooNE
Test LSND indication of νμ νe oscillationbull Keep LE same but different energy systematic errors
background add anti-neutrino capabilityndash Neutrino Energy MiniBooNE ~500MeV (LSND ~30MeV)ndash Baseline MiniBooNE ~500m (LSND ~30m)
bull MiniBooNE detector 800t pure mineral oilbull Operation since Nov 2002
Primary (protons) Secondary (mesons) Tertiary (neutrinos)
MiniBooNE Proton Beam Linebull 8 GeV proton beam from Booster
ndash 16 μs spillndash 5Hz rate ndash Maximum intensity 5middot1012 ppp
bull Beam on target σ lt 1mm
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
13
MiniBooNE Secondary Beam Line
bull Targetndash 7 Be slugs (71cm long 17 λ) cooled by air flow
bull Hornndash 170kA 140 μs 5 Hz average water cooled polarity change possible (~1-2 weeks)
bull Decay pipe ndash filled with air earth around can be cooled via air ducts and heat exchanger
bull 25 m absorber ndash INOUT movable provides systematic checks on νe contamination from μ decays
bull 50m absorberbull Little Muon counter (LMC)
ndash in situ measurement of Kaon background by counting muons produced from K decays
8 GeV Beamline
TargetHorn25m Absorber
(movable)50m Absorber
(fixed)
25m50m
(18m)
LMC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
14
MiniBooNE Statistics
2003 20052004 2006 2007 2008
Anti-neutrinos
26801 Million
11 E20
880703
Motivation for Anti-neutrino modendashContinue cross-section measurements ndashSearching for anti-neutrino disappearance
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
15
MiniBooNE Horn
bull Water leak and ground fault killed first horn at ~96 million pulses (detected ~end 2003 removed Oct 2004)
ndash Striplinehorn connection was corrodedndash Suspect is galvanic corrosion at bellows seal due to stagnant water around the spray
nozzlesbull New horn
Bottom water outlet bellows ndash Reduce number of material transitions by welding flanges ndash Avoid stagnant water by refitting with drain lines and new dehumidification system
Second horn already 187 million pulses
LessonsWe know how to design inner conductors to resist fatigue Concentrate on peripherals
Galvanic corrosion avoid trapped water foresee drainage choose material carefully
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
9
(includes Beam studies and tunings)Physics run From June 1999 to Nov 2004
K2K-IFrom June 1999 to July 2001Delivered POT 561 x 1019
Used for physics analysis 479 x 1019
K2K-IIFrom Dec 2002 to Nov 2004Delivered POT 488x1019
Used for physics analysis 443x1019
Total delivered POT (K2K I+II)1049 x 1020
Used for analysis 0922 x 1020
K2K Protons on Target
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
10
2004 ndash No exchange due to high radiationndash Nov 2004 Inner conductor of 1st horn
brokendash Radiation too high for replacement
00E+00
20E+06
40E+06
60E+06
80E+06
10E+07
12E+07
14E+07
99
01
99
05
99
09
00
01
00
05
00
09
01
01
01
05
01
09
02
01
02
05
02
09
03
01
03
05
03
09
04
01
04
05
04
09
05
01
Run1999
Run2000
H1-3-5φ25
H1-4φ30
H2-2
H2-1
H1-7φ30
H2-3
H1-3φ25
H1-2φ20
H1-6φ25
Parabolic disk
Run2001
H1-8φ30
H1-8φ
30
Run2002-03
Run2004
K2K Horn
LessonsIn-situ work reaches RP limit
Design with remote handling amp spare systems
Decouple target and hornDec 2004 end of runndash POT almost 1020 as scheduled
Strategy preventive exchange every yearIn total five 1st horns four 2nd horns Accessible no remote handling
horn pulses
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
11
MiniBooNE
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
12
MiniBooNE
Test LSND indication of νμ νe oscillationbull Keep LE same but different energy systematic errors
background add anti-neutrino capabilityndash Neutrino Energy MiniBooNE ~500MeV (LSND ~30MeV)ndash Baseline MiniBooNE ~500m (LSND ~30m)
bull MiniBooNE detector 800t pure mineral oilbull Operation since Nov 2002
Primary (protons) Secondary (mesons) Tertiary (neutrinos)
MiniBooNE Proton Beam Linebull 8 GeV proton beam from Booster
ndash 16 μs spillndash 5Hz rate ndash Maximum intensity 5middot1012 ppp
bull Beam on target σ lt 1mm
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
13
MiniBooNE Secondary Beam Line
bull Targetndash 7 Be slugs (71cm long 17 λ) cooled by air flow
bull Hornndash 170kA 140 μs 5 Hz average water cooled polarity change possible (~1-2 weeks)
bull Decay pipe ndash filled with air earth around can be cooled via air ducts and heat exchanger
bull 25 m absorber ndash INOUT movable provides systematic checks on νe contamination from μ decays
bull 50m absorberbull Little Muon counter (LMC)
ndash in situ measurement of Kaon background by counting muons produced from K decays
8 GeV Beamline
TargetHorn25m Absorber
(movable)50m Absorber
(fixed)
25m50m
(18m)
LMC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
14
MiniBooNE Statistics
2003 20052004 2006 2007 2008
Anti-neutrinos
26801 Million
11 E20
880703
Motivation for Anti-neutrino modendashContinue cross-section measurements ndashSearching for anti-neutrino disappearance
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
15
MiniBooNE Horn
bull Water leak and ground fault killed first horn at ~96 million pulses (detected ~end 2003 removed Oct 2004)
ndash Striplinehorn connection was corrodedndash Suspect is galvanic corrosion at bellows seal due to stagnant water around the spray
nozzlesbull New horn
Bottom water outlet bellows ndash Reduce number of material transitions by welding flanges ndash Avoid stagnant water by refitting with drain lines and new dehumidification system
Second horn already 187 million pulses
LessonsWe know how to design inner conductors to resist fatigue Concentrate on peripherals
Galvanic corrosion avoid trapped water foresee drainage choose material carefully
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
10
2004 ndash No exchange due to high radiationndash Nov 2004 Inner conductor of 1st horn
brokendash Radiation too high for replacement
00E+00
20E+06
40E+06
60E+06
80E+06
10E+07
12E+07
14E+07
99
01
99
05
99
09
00
01
00
05
00
09
01
01
01
05
01
09
02
01
02
05
02
09
03
01
03
05
03
09
04
01
04
05
04
09
05
01
Run1999
Run2000
H1-3-5φ25
H1-4φ30
H2-2
H2-1
H1-7φ30
H2-3
H1-3φ25
H1-2φ20
H1-6φ25
Parabolic disk
Run2001
H1-8φ30
H1-8φ
30
Run2002-03
Run2004
K2K Horn
LessonsIn-situ work reaches RP limit
Design with remote handling amp spare systems
Decouple target and hornDec 2004 end of runndash POT almost 1020 as scheduled
Strategy preventive exchange every yearIn total five 1st horns four 2nd horns Accessible no remote handling
horn pulses
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
11
MiniBooNE
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
12
MiniBooNE
Test LSND indication of νμ νe oscillationbull Keep LE same but different energy systematic errors
background add anti-neutrino capabilityndash Neutrino Energy MiniBooNE ~500MeV (LSND ~30MeV)ndash Baseline MiniBooNE ~500m (LSND ~30m)
bull MiniBooNE detector 800t pure mineral oilbull Operation since Nov 2002
Primary (protons) Secondary (mesons) Tertiary (neutrinos)
MiniBooNE Proton Beam Linebull 8 GeV proton beam from Booster
ndash 16 μs spillndash 5Hz rate ndash Maximum intensity 5middot1012 ppp
bull Beam on target σ lt 1mm
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
13
MiniBooNE Secondary Beam Line
bull Targetndash 7 Be slugs (71cm long 17 λ) cooled by air flow
bull Hornndash 170kA 140 μs 5 Hz average water cooled polarity change possible (~1-2 weeks)
bull Decay pipe ndash filled with air earth around can be cooled via air ducts and heat exchanger
bull 25 m absorber ndash INOUT movable provides systematic checks on νe contamination from μ decays
bull 50m absorberbull Little Muon counter (LMC)
ndash in situ measurement of Kaon background by counting muons produced from K decays
8 GeV Beamline
TargetHorn25m Absorber
(movable)50m Absorber
(fixed)
25m50m
(18m)
LMC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
14
MiniBooNE Statistics
2003 20052004 2006 2007 2008
Anti-neutrinos
26801 Million
11 E20
880703
Motivation for Anti-neutrino modendashContinue cross-section measurements ndashSearching for anti-neutrino disappearance
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
15
MiniBooNE Horn
bull Water leak and ground fault killed first horn at ~96 million pulses (detected ~end 2003 removed Oct 2004)
ndash Striplinehorn connection was corrodedndash Suspect is galvanic corrosion at bellows seal due to stagnant water around the spray
nozzlesbull New horn
Bottom water outlet bellows ndash Reduce number of material transitions by welding flanges ndash Avoid stagnant water by refitting with drain lines and new dehumidification system
Second horn already 187 million pulses
LessonsWe know how to design inner conductors to resist fatigue Concentrate on peripherals
Galvanic corrosion avoid trapped water foresee drainage choose material carefully
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
11
MiniBooNE
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
12
MiniBooNE
Test LSND indication of νμ νe oscillationbull Keep LE same but different energy systematic errors
background add anti-neutrino capabilityndash Neutrino Energy MiniBooNE ~500MeV (LSND ~30MeV)ndash Baseline MiniBooNE ~500m (LSND ~30m)
bull MiniBooNE detector 800t pure mineral oilbull Operation since Nov 2002
Primary (protons) Secondary (mesons) Tertiary (neutrinos)
MiniBooNE Proton Beam Linebull 8 GeV proton beam from Booster
ndash 16 μs spillndash 5Hz rate ndash Maximum intensity 5middot1012 ppp
bull Beam on target σ lt 1mm
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
13
MiniBooNE Secondary Beam Line
bull Targetndash 7 Be slugs (71cm long 17 λ) cooled by air flow
bull Hornndash 170kA 140 μs 5 Hz average water cooled polarity change possible (~1-2 weeks)
bull Decay pipe ndash filled with air earth around can be cooled via air ducts and heat exchanger
bull 25 m absorber ndash INOUT movable provides systematic checks on νe contamination from μ decays
bull 50m absorberbull Little Muon counter (LMC)
ndash in situ measurement of Kaon background by counting muons produced from K decays
8 GeV Beamline
TargetHorn25m Absorber
(movable)50m Absorber
(fixed)
25m50m
(18m)
LMC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
14
MiniBooNE Statistics
2003 20052004 2006 2007 2008
Anti-neutrinos
26801 Million
11 E20
880703
Motivation for Anti-neutrino modendashContinue cross-section measurements ndashSearching for anti-neutrino disappearance
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
15
MiniBooNE Horn
bull Water leak and ground fault killed first horn at ~96 million pulses (detected ~end 2003 removed Oct 2004)
ndash Striplinehorn connection was corrodedndash Suspect is galvanic corrosion at bellows seal due to stagnant water around the spray
nozzlesbull New horn
Bottom water outlet bellows ndash Reduce number of material transitions by welding flanges ndash Avoid stagnant water by refitting with drain lines and new dehumidification system
Second horn already 187 million pulses
LessonsWe know how to design inner conductors to resist fatigue Concentrate on peripherals
Galvanic corrosion avoid trapped water foresee drainage choose material carefully
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
12
MiniBooNE
Test LSND indication of νμ νe oscillationbull Keep LE same but different energy systematic errors
background add anti-neutrino capabilityndash Neutrino Energy MiniBooNE ~500MeV (LSND ~30MeV)ndash Baseline MiniBooNE ~500m (LSND ~30m)
bull MiniBooNE detector 800t pure mineral oilbull Operation since Nov 2002
Primary (protons) Secondary (mesons) Tertiary (neutrinos)
MiniBooNE Proton Beam Linebull 8 GeV proton beam from Booster
ndash 16 μs spillndash 5Hz rate ndash Maximum intensity 5middot1012 ppp
bull Beam on target σ lt 1mm
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
13
MiniBooNE Secondary Beam Line
bull Targetndash 7 Be slugs (71cm long 17 λ) cooled by air flow
bull Hornndash 170kA 140 μs 5 Hz average water cooled polarity change possible (~1-2 weeks)
bull Decay pipe ndash filled with air earth around can be cooled via air ducts and heat exchanger
bull 25 m absorber ndash INOUT movable provides systematic checks on νe contamination from μ decays
bull 50m absorberbull Little Muon counter (LMC)
ndash in situ measurement of Kaon background by counting muons produced from K decays
8 GeV Beamline
TargetHorn25m Absorber
(movable)50m Absorber
(fixed)
25m50m
(18m)
LMC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
14
MiniBooNE Statistics
2003 20052004 2006 2007 2008
Anti-neutrinos
26801 Million
11 E20
880703
Motivation for Anti-neutrino modendashContinue cross-section measurements ndashSearching for anti-neutrino disappearance
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
15
MiniBooNE Horn
bull Water leak and ground fault killed first horn at ~96 million pulses (detected ~end 2003 removed Oct 2004)
ndash Striplinehorn connection was corrodedndash Suspect is galvanic corrosion at bellows seal due to stagnant water around the spray
nozzlesbull New horn
Bottom water outlet bellows ndash Reduce number of material transitions by welding flanges ndash Avoid stagnant water by refitting with drain lines and new dehumidification system
Second horn already 187 million pulses
LessonsWe know how to design inner conductors to resist fatigue Concentrate on peripherals
Galvanic corrosion avoid trapped water foresee drainage choose material carefully
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
13
MiniBooNE Secondary Beam Line
bull Targetndash 7 Be slugs (71cm long 17 λ) cooled by air flow
bull Hornndash 170kA 140 μs 5 Hz average water cooled polarity change possible (~1-2 weeks)
bull Decay pipe ndash filled with air earth around can be cooled via air ducts and heat exchanger
bull 25 m absorber ndash INOUT movable provides systematic checks on νe contamination from μ decays
bull 50m absorberbull Little Muon counter (LMC)
ndash in situ measurement of Kaon background by counting muons produced from K decays
8 GeV Beamline
TargetHorn25m Absorber
(movable)50m Absorber
(fixed)
25m50m
(18m)
LMC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
14
MiniBooNE Statistics
2003 20052004 2006 2007 2008
Anti-neutrinos
26801 Million
11 E20
880703
Motivation for Anti-neutrino modendashContinue cross-section measurements ndashSearching for anti-neutrino disappearance
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
15
MiniBooNE Horn
bull Water leak and ground fault killed first horn at ~96 million pulses (detected ~end 2003 removed Oct 2004)
ndash Striplinehorn connection was corrodedndash Suspect is galvanic corrosion at bellows seal due to stagnant water around the spray
nozzlesbull New horn
Bottom water outlet bellows ndash Reduce number of material transitions by welding flanges ndash Avoid stagnant water by refitting with drain lines and new dehumidification system
Second horn already 187 million pulses
LessonsWe know how to design inner conductors to resist fatigue Concentrate on peripherals
Galvanic corrosion avoid trapped water foresee drainage choose material carefully
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
14
MiniBooNE Statistics
2003 20052004 2006 2007 2008
Anti-neutrinos
26801 Million
11 E20
880703
Motivation for Anti-neutrino modendashContinue cross-section measurements ndashSearching for anti-neutrino disappearance
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
15
MiniBooNE Horn
bull Water leak and ground fault killed first horn at ~96 million pulses (detected ~end 2003 removed Oct 2004)
ndash Striplinehorn connection was corrodedndash Suspect is galvanic corrosion at bellows seal due to stagnant water around the spray
nozzlesbull New horn
Bottom water outlet bellows ndash Reduce number of material transitions by welding flanges ndash Avoid stagnant water by refitting with drain lines and new dehumidification system
Second horn already 187 million pulses
LessonsWe know how to design inner conductors to resist fatigue Concentrate on peripherals
Galvanic corrosion avoid trapped water foresee drainage choose material carefully
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
15
MiniBooNE Horn
bull Water leak and ground fault killed first horn at ~96 million pulses (detected ~end 2003 removed Oct 2004)
ndash Striplinehorn connection was corrodedndash Suspect is galvanic corrosion at bellows seal due to stagnant water around the spray
nozzlesbull New horn
Bottom water outlet bellows ndash Reduce number of material transitions by welding flanges ndash Avoid stagnant water by refitting with drain lines and new dehumidification system
Second horn already 187 million pulses
LessonsWe know how to design inner conductors to resist fatigue Concentrate on peripherals
Galvanic corrosion avoid trapped water foresee drainage choose material carefully
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
16MiniBooNE Absorberbull Observation during early anti-neutrino run (2006)
ndash Decreasing NuPOT bull After much effort problem was understood
ndash Several absorber plates from 25m movable absorber fell into the beamndash Caused drop in event yield
Hardened steel chains weakened by radioactive atmospherePlates were remounted using softer steel which is not subject tohydrogen embrittlement effect
Lessonsair in decay tube aggressive radicals CNGS vacuum K2K amp T2K HeliumNuMI vacuum since Dec 07 Helium
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
17
NuMI
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
18
Neutrino beam
NuMI Neutrinos at the Main Injectorbull Search for oscillation
νμ ντ disappearance
bull 735 km baseline ndash From Fermilab to Minnesotandash Elevation of 33degndash Near detector ~1ktonsndash Far detector MINOS 54 ktons
bull Commissioned in 2004bull Operating since 2005
bull From Main Injector 120 GeVcbull Cycle length 19 sbull Pulse length 10μsbull Beam intensity 3 middot 1013 pppbull σ sim1mm
NuMI Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
19
bull Water cooled graphite target ndash 2 interaction lengths ndash Target movable in beam direction inside horn to change ν energy
bull 2 hornsndash Water cooled pulsed with 2ms half-sine wave pulse of up to 200kA
bull Decay pipe ndash 675m diameter 2m vacuum 1 mbar since Dec07 Helium 1bar
bull Hadron absorber ndash Absorbs ~100kW protons and other hadrons
bull 1 hadron monitor fluxes and profilesbull 3 muon monitor stations fluxes and profiles
NuMI Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
20
NuMI Proton ParametersPr
oton
s pe
r Wee
k (E
18)
M amp D
M amp D
20089 Booster batches to NuMI
allows increasing the MI beam power to 340 KW
Average intensitypulse (20072008) lt 308middot1013 pppgtAverage beam power (20072008) lt 2336 kW gt
486middot1020 Protons on Target as of 02 June lsquo08
Tota
l Pro
tons
(E20
)
067middot1020 p2005
103middot1020 p2006
191middot1020 p2007
126middot1020 p2008
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
21NuMI Target
Water cooling tubeprovides mechanical support
47 graphite segments 20mm length and 64 x 15mm2 cross-section03mm spacing between segments total target length 954 cm (2 interaction lengths)
BaffleTarget
TargetBaffle carrierAllows for 25 m of target motion to vary the beam
energy
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
22
protonHorn 1
HoTarget
hellip NuMI Target 1 Water leak soon after turn-on
(March 2005) lsquofixedrsquo with He backpressure
holding back water from leak2 September 2006 Target
motion drive shaft locked due to corrosion
lead to target replacement3 June 2008 Target
longitudinal drive failureIn work cell repairedreinstall
Water in target
vacuum chamber
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
23NuMI Horns ExperienceSeveral problems
Ground fault water line contamination by resin beads water leaks at ceramic isolatorhellip
bull System designs looked toward hot component replacement not repair
bull However most problems have been repairablendash Challenging after beam operation
bull Most recent failure (June 08) led to replacement of horn 1 due to high radiation field making repair too challenging
Lessons Concentrate in design on peripherals (insulating water lines)Design with repair in mind test thoroughly without beam Foresee tooling trainingWork Cell
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
24
Connections done through module by person on top of work cell
3 m
NuMI Work Cell
Railing
Lead-glass window
HornRemote lifting table
Concrete wall
Module
Installed in most downstream part of target area
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
25
NuMI Radiological Aspects
bull Tritium levels major issue Levels much greater than expected in water pumped from NuMI tunnelndash Very low levels compared to regulatory limits but important to
solvendash Major source traced to production in steel surround for target
hall chase Carried to tunnel water by moisture in chase airndash Effective remedy through major dehumidification of target
hall and chase airbull Positive side effect controlling corrosion effects for technical
components (previously 60 rel humidity now lt20)
bull Target hall shielding effectiveness and air activation levelsndash Matched expectations
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
26
CNGS
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
27CNGSbull Search for νμ minus ντ oscillation (appearance experiment)bull 732 km baseline
ndash From CERN to Gran Sasso (Italy)ndash Elevation of 59degndash Far detector OPERA 146000 emulsion bricks (121 kton) Icarus 600 tons
bull Commissioned 2006bull Operation since 2007
CERN
Gran Sasso
bull From SPS 400 GeVcbull Cycle length 6 sbull Extractions
ndash 2 separated by 50msbull Pulse length 105μsbull Beam intensity
ndash 2x 24 middot 1013 pppbull σ sim05mmbull Beam performance
ndash 45middot 1019 potyear
CNGS Proton Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
28
434m100m
1095m 18m 5m 5m67m
27m
TBID
Air cooled graphite target magazinendash 4 in situ sparesndash 27 interaction lengthsndash Target table movable horizontallyvertically for alignment
bull TBID multiplicity detectorbull 2 horns (horn and reflector)
ndash Water cooled pulsed with 10ms half-sine wave pulse of up to 150180kA 03Hz remote polarity change possible
bull Decay pipe ndash 1000m diameter 245m 1mbar vacuum
bull Hadron absorber ndash Absorbs 100kW of protons and other hadrons
bull 2 muon monitor stations muon fluxes and profiles
CNGS Secondary Beam Line
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
29
CNGS Beambull 2006 CNGS Commissioning
ndash 85middot1017 potbull 2007 6 weeks CNGS run
ndash 79middot1017 potbull 38 OPERA events in bricks (~60000 bricks)
ndash Maximum intensity 4middot1013 potcyclebull Radiation limits in PS
OPERA detector completed by June 2008CNGS modifications finished
bull 2008 CNGS run June-November NOW ndash 543middot1017 pot on Friday 27Jun08 after 9 days running
more than 50 OPERA events in bricksndash Expected protons in 2008 ~26 middot1019 pot
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
30CNGS Polarity Puzzle
bull Observation of asymmetry in horizontal direction betweenndash Neutrino (focusing of mesons with
positive charge)ndash Anti-neutrino (focusing of mesons
with negative charge)
270cm
1125cm
Muon DetectorMuon detectors very sensitive to any beam change ndashgive online feedback for neutrino beam quality
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
31hellip CNGS Polarity PuzzleExplanation Earth magnetic field in 1km long decay tube
ndash calculate B components in CNGS reference systemndash Partially shielding of magnetic field due to decay tube steel
Results in shifts of the observed magnitudeMeasurements and simulations agree very well
LessonsUseful to change polarity quickly
Lines simulated μ fluxPoints measurementsNormalized to max=1
NeutrinoFocusing on
positive charge
Anti-neutrinoFocusing on
negative charge
FLU
KA
sim
ulat
ions
P S
ala
et a
l 200
8
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
32CNGS TargetTarget 13 graphite rods 10cm long Oslash = 5mm andor 4mm
Ten targets (+1 prototype) have been built They are assembled in two magazines
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
33hellipCNGS Target
ndash Target table motorizedndash Horn and Reflector
tables NOT
0
02
04
06
08
1
12
14
16
18
-5 -4 -3 -2 -1 0 1 2 3 4 5 6 7
BPM2 [mm]
arbi
trar
y un
it
1) Beam scan across target
2) Target scan across horn
Alignment of target-horns- beam done with survey team during installationbull sensitivity of order of 1mmbull changes every yearbeam based alignment of target hall components
Lessonsalignment with beam to be done during every start-upmuon detectors very sensitive Offset of target vs horn at
01mm level beam vs target at 005mm level
Beam position monitor
mul
tiplic
ty
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
34
CNGS Horn and Reflector
bull Remote electrical connectionbull Remote water connectionbull Remote shielding handling
Exchange of horn remotely
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
35
hellip CNGS Horn and Reflectorbull Leak in water outlet of cooling circuit of
reflector after 4105 pulses (Oct 06)Design fault in ceramic insulator brazing
Repair and exchange possiblendash Replace brazed connections by connections
under pressure
ndash Detailed dose planning ndash Detailed tooling and trainingndash Additional local shielding
total integrated dose 16mSvbull Aug 2007 Cracks in busbar flexible
connection of reflectorndash New design during shutdown 200708 for
horn and reflector
Lessons Concentrate in design on peripherals
(insulating water lines)Design with repair in mind test
thoroughly without beam Foresee tooling training
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
36CNGS Radiation Issues
200607106 hcm2yr
2008++
CNGS no surface building above CNGS target area Large fraction of electronics in tunnel area
bull During CNGS run 2007 ndash Failure of ventilation system installed in the CNGS tunnel area due to
radiation effects in the control electronics (SEU due to high energy hadron fluence)
bull Modifications during shutdown 200708ndash move as much electronics as possible out of CNGS tunnel areandash Create radiation safe area for electronics which needs to stay in CNGSndash Add shielding decrease radiation by up to a factor 106
Lessonsmove electronics to surface building if possibledonrsquot design straight tunnels between target area and service gallery-
use chicane designbe aware of standard components in electronicsaddress radiation hardness of installed electronics and material for
high intensity areas
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
37
hellip CNGS Radiation Issues
bull Tritium level in sumps similar observation like at NuMI
bull Special treatment required for waterndash Alkaline (activated) water in hadron stop sumpndash Collection of hydrocarbons upstream of target area ndash luckily
not activatedbull Ventilation and water cooling system
ndash Fine tuning of valves ventilator tedious long commissioning time
ndash Efficient leak detection in case of water leak
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
38
T2K Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
39
T2KLong baseline neutrino oscillation experiment from Tokai to Kamioka
TokaiKamioka
Physics goalsDiscovery of νμrarrνe appearance Precise meas of disappearance νμrarrνx
J-PARC075MW 50GeV PS
Super-K 50 ktonWater Cherenkov
Pseudo-monochromatic low energy off-axis beam tunable by changing theoff-axis angel between 2 deg and 25deg (Eν = 08GeV ~065 GeV)
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
40
Neutrino Facility Neutrino Facility at Jat J--PARCPARC
T2K Beam Line Neutrino Facility Neutrino Facility at Jat J--PARCPARC
Installed and aligned
Installed Mar 08
1014 doublets installed
Completed in Dec 08
Construction of building Jun08Target full prototype Dec08
Horns 1amp3 delivered and testedHorn2 delivered Jun08Assembly starts Aug08
FinishedAug08
AssemblySep08
InstallationOct08
On axis detectorAvalaible day oneOff axis detectorFall 09 for high-
intensity operation
First Neutrino BeamApril 2009
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
41
Summary
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
42Summarybull Neutrino beam design
ndash Basics are lsquostraightforwardrsquo + lots of experience(Beam optics Monte Carlo mechanicalelectrical design tools)
bull Start-up and initial (lower intensity) running ndash Generally very smooth
bull Hostile environmentndash Radioactivity (high intensity high energy proton beams)ndash Humidity (water cooling infiltrationshellip)ndash Mechanical shocks (particle and electric pulses)
bull Design tends to be compromise ofndash Long lifetime of equipmentndash Maximal performance of beamndash Remote repair vs remote exchange of equipment
BUT Challenges
Problems start at higher intensitieshellip
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
43
hellip Summarybull Problem areas found
ndash Corrosion (horn target auxiliary components)ndash Fatigue (design flawshellip)ndash Tritiumndash Electronics (radiation issues of standard components)
Example CNGSbull 2006 initial commissioning (20 days)
ndash Horn water leak after ~6 weeks of runningdesignbrazing errorlesson test COMPLETE systems
bull 2007 re-commissioning (11 days)ndash Ventilation problems after ~3 weeks of running
radiation on electronics SEUlesson any object on the market today contains electronics
componentsbull 2008 re-commissioning (7 days)
Keep running now
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
44
Many Thanks for all Contributions
Sam Childress Sacha Kopp Peter Kasper Kazuhiro Tanaka Takashi Kobayashi Ans
Pardons Heinz Vincke
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities
NuFact2008 Valencia 1 July 2008E Gschwendtner CERN
45
Proton Beam Lines for Neutrino Beams-Extraction Transport and Targeting
bull For all Neutrino beam linesndash Careful designndash Extraction line equipment stable and reproduciblendash Good magnet stability in transfer linendash Fully automated beam position control ndash Negligible beam lossesndash Comprehensive beam interlock system
No major problemsWatch out for much higher intensities