beam-gas vertexing as an lhc diagnostics device: an overview
DESCRIPTION
Beam-Gas Vertexing as an LHC diagnostics device: an overview. Motivation Concept Plamen will give details about design parameters (rates, acceptance, , etc.) Organization More in Bernd’s talk. LHC emittance measurement. Neglecting dispersion, the beam size is given by size - PowerPoint PPT PresentationTRANSCRIPT
BGV meeting 12-Jun-2013 EPFL Massimiliano Ferro-Luzzi 1
Beam-Gas Vertexing as an LHC Beam-Gas Vertexing as an LHC diagnostics device: an overviewdiagnostics device: an overview
Motivation Concept Plamen will give details about design parameters (rates, acceptance, ,
etc.)
Organization More in Bernd’s talk
BGV meeting 12-Jun-2013 EPFL Massimiliano Ferro-Luzzi 2
LHC emittance measurementLHC emittance measurement
Neglecting dispersion, the beam size is given by size
2 = where = X or Y (H or V)
optics function
emittance This is what is needed! = usually taken from machine model + optics measurements = measured from various devices:
– Wire Scanners (WS)
– Synchrotron light monitors (BSRT)
– Beam-gas ionization monitors (BGI)
– Luminosity scans
typical values of at LHC: 0.2 – 1 mm
typical values of at LHC: 0.2 – 1 mm
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Current limitations of LHC emittance monitorsCurrent limitations of LHC emittance monitors
Wire Scanners (WS): cannot be used beyond a given intensity limit (depends on energy), wires break, movable device, not a continuous measurement, saturation effects (need to adjust PMT HV vs beam intensity).
Synchrotron light monitors (BSRT): absolute calibration is difficult, the source point moves during ramp, too small signal for ions at low energy, ...
Beam-gas ionization monitors (BGI): broadening of the profile due to too weak guiding field, distortion, difficult calibration, ...
Luminosity scans: must move the beams at the experiments, measures a convolution of two beam emittances, takes times, ...
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LHCb as a demonstrator of beam-gas imagingLHCb as a demonstrator of beam-gas imaging
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See Plamen’s talk at recent WorkshopSee Plamen’s talk at recent Workshop9th DITANET Topical Workshop on Non-Invasive Beam Size Measurement for High Brightness Proton and Heavy Ion Accelerators, 16 April 2013
Can do also: full transverse profiles (not just RMS), ghost charge, relative bunch chargesNon intrusive! No beams moved !
Can do also: full transverse profiles (not just RMS), ghost charge, relative bunch chargesNon intrusive! No beams moved !
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Proposal to use BGV at LHCProposal to use BGV at LHC
Phase 1: BGV demonstrator at LHC ring2 (LS1)– make a sequence of measurements, bunch-by-bunch, during the ramp
Phase 2: build a full-blown BGV for each LHC ring (LS2)
Later ... other accelerators ?
«collaboration» required: BE-BI, TE-VSC, PH, EPFL, Aachen
Proposal presented at LMC 164 (27/3/2013):... «Steve Myers summarized that in principle the LMC agreed that this was a very important, useful piece of equipment. Frederick Bordry invited Plamen Hopchev and Rhodri Jones to come to the LSC meeting on Friday morning to check the full impact .»
Also presented to and supported by HL-LHC committee.
Proposal presented at LMC 164 (27/3/2013):... «Steve Myers summarized that in principle the LMC agreed that this was a very important, useful piece of equipment. Frederick Bordry invited Plamen Hopchev and Rhodri Jones to come to the LSC meeting on Friday morning to check the full impact .»
Also presented to and supported by HL-LHC committee.
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Passed milestonesPassed milestones
2013-03-18: HL-LHC Technical Committee– The demonstrator BGV project is approved and funded by HL-LHC
2013-03-27: Lhc Machine Committee Slides– LMC approves continued development of the monitor
– LMC states that amount of work done in LS1 will depend on impact on the schedule & other Groups
2013-05-17: Long Shutdown Committee Slides– Presented the project and the space-reservation request
– Request accepted 2013-06-04: LHCb Technical Board
– LHCb accepts to provide spare equipment if available in sufficient quantities
More milestones to be defined... ( =>Bernd’s talk)
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Who is BGV ? Who is BGV ? (in random order apart from (in random order apart from PhD studentsPhD students dedicated to BGV) dedicated to BGV)
LPHE:
Guido Haefeli
Mark Tobin
Frederic Blanc
Raymond Frei
Aurelio Bay
Tatsuya Nakada
Bernard Florian
...
Aachen:
Thomas Kirn
Stefan Schael
...
CERN/BE:
Maria Kuhn
Quentin Veyrat
Plamen Hopchev
Enrico Bravin
Bernd Dehning
Ray Veness
Nicolas Chritin
Giuseppe Bregliozzi (TE)
Benoit Salvant
...
CERN/PH:
Mariana Rihl
Rosen Matev
Colin Barschel
MFL
Richard Jacobsson
Jaap Panman
...
to be further developed/defined/formalized...to be further developed/defined/formalized...
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Demonstrator: gas target sketchDemonstrator: gas target sketchgas injection and accumulation
pumping pumping
WF suppression
detector
detector
long (small diameter) pipes act as flow restrictions
ideal pressure profile
z
p
more realistic pressure profile
this must be transparent! (thin)
beam
Reminder: contrary to VELO/LHCb, here gas injection must be continuous (with beam)... Consider impact on machine!Reminder: contrary to VELO/LHCb, here gas injection must be continuous (with beam)... Consider impact on machine!
to be optimized:ratio of useful/total gas integralto be optimized:ratio of useful/total gas integral
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storage
Demonstrator: gross conceptDemonstrator: gross concept
FE electronics
Readoutsupervisor
trackingdetectors timing/trig
detectors
readoutboards
gas target
readoutnetwork
CPU farm
Shielded area
LHC tunnel
LHC clockdata
(max 1MHz) trigger
Use SciFi/SiPM !Use VELO-like readout (Beetle to Tell1).
Raw gas rates: 50Hz/1011p per meter of 6.4x10-8 mbar NeHence:- full beam (3x1014p)- full gas length (5m)0.75MHz raw rateShould stay <1MHz!!simple activity trigger
Evt size = ~ 17 bits/clus * 10 clus/plane/Evt * 8 planes = 0.2 kB/Evt0.2 kB/evt * 1 kEvt/s = 0.2 MB/s0.2 MB/s * 107 s = 2 TB/year may need to think about nano events...
High Level Trigger: 1 MHz input rate thlt = avge time to take HLT decisionNcpu = nr of CPU cores available in HLT = 100We need to achieve thlt < Ncpu / RL0 = 0.1 ms
Aim: about 200 good events per 1e11p bunch in a few minutes => need about 1Hz good events per nominal bunch
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VME 9U
VME 6U
VME 9U
detector DAQ / CTRL (VELO like)detector DAQ / CTRL (VELO like)
FE board
drv drv LVreg
ECS
HV1 per SiPM ?
x8x8
x8x8
TELL1ADC
drv
ADC
ADC
x8x8
CTRL
Gbit nw to CPUs
READOUTSUPERVISOR
SPECS slave
designed for ~kGy krad «no radiation»
voltage supply
ctrl/trig
data
ADC
copper, analog
patch
4 Beetles per drv
TTCTTCex
1m
25m(L>25m must be tested)
60m
drvcould be th
e
same crate LHC clock
Zero suppressionZero suppression
L0 trig
LV
L0 detector signals
max
6 F
E b
oard
sm
ax 6
FE
boa
rds
controlPCSPECS
MASTER
SciFi mattress SiPM
SiPM
SiPM
Beetle
Beetle
Beetle
SiPMBeetleSciFi mattress
SiPM
SiPM
SiPM
Beetle
Beetle
Beetle
SiPMBeetleSciFi mattress
SiPM
SiPM
SiPM
Beetle
Beetle
Beetle
SiPMBeetleSciFi mattress
SiPM
SiPM
SiPM
Beetle
Beetle
Beetle
SiPMBeetle
x2x2
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detector side of readout chaindetector side of readout chain
example here from VELO Zap test (PS booster 2009) Reminder:
1 drv card = 1 data cable = 4 Beetles
Repeater (FE) boardRepeater (FE) board
Analog data cablesAnalog data cables
Control/trig cableControl/trig cable
here only 2 out of 4
here bricolaged from two CAT6 cables
Temperatures cableTemperatures cable
here only 2 out of 4 driver cards
LVregLVreg
drvdrv
ECS mezzanineECS mezzanine
LV and HVLV and HV
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Ctrl & Readout systemCtrl & Readout system
will more or less look like this:
(here a picture from the VELO assembly lab)
For BGV, we need:
8 equiped TELL1s
1 crate (Tell1 9U)
2 CTRL boards
8 equiped RPT boards
1 ODIN + Cu2Opt
ODINODIN
temperatures boardtemperatures board
CONTROL boardCONTROL board
TELL1sTELL1s
Copper2OpticalCopper2Optical
Analog cablesAnalog cables
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Location: ring 2 , left of IP4Location: ring 2 , left of IP4
~10m~10m
beam 2AA
CC
BB
Detector
Rack
Rack
Approximate distances: A-B = 20m, B-C = 25m Location B for DAQ/CTRL would be better: shorter cables, cheaper (maybe we
have most cables already!) and no uncertainty about CTRL board cable lengths... Can we merge C into B ?? In fact, anywhere in the pink area would be OK (<25m)
Location D: power outlet ? E: network connections ?
D ?D ? power outlets E ?E ? IP connections
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Tunnel space (about 222m left of IP4)Tunnel space (about 222m left of IP4)
ring2ring2ring1ring1
IP4IP4
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Global time lineGlobal time line
Anything that cannot be installed in a short technical stop, should be installed in LS1 !
More in Bernd’s talk
20132013 20142014 20152015
Design studies / specs
Production/testing
Installation
Commissioning
Sep: BGV ECR (technical design)
Jun: end of (heavy) work in tunnel
Feb: Beam ?
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Work packages and coordinationWork packages and coordination
Today: agree on WP & Coordinators Next step: define subtasks, names of responsibles, and milestones
Vacuum systemBE / Bernd Dehning
Detector modulesEPFL / Aurelio
Bay ?
Control & MonitoringBE / Plamen Hopchev ?
Cooling R&D/design
EPFL / Aurelio Bay ?
Mechanical support
BE / Ray Veness ?
Global Coordination
BE / Bernd Dehning& Plamen Hopchev
SciFiAachen / Thomas
?
Btl PCBEPFL / Guido
Module designEPFL / Guido ?
...
Physics softwareBE / Plamen
Hopchev
Trig/DAQPH / MFL
... cooling /services ?cooling /services ?