july 19, 2003 hep03, aachen p. shanahan minos collaboration 1 status of the minos experiment argonne...
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July 19, 2003 HEP03, Aachen
P. ShanahanMINOS Collaboration
1
STATUS of the MINOS Experiment
Argonne • Athens • Brookhaven • Caltech • Cambridge • Campinas • Dubna • Fermilab College de France • Harvard • Illinois Inst. of Technology • Indiana • ITEP-Moscow •
Lebedev Livermore • Macalester • Minnesota-Twin Cities • Minnesota-Duluth • Oxford • Pittsburgh Protvino • Rutherford • Sao Paulo • South Carolina • Stanford • Sussex • Texas
A&MTexas-Austin • Tufts • University College London • Western Washington • Wisconsin
July 19, 2003 HEP03, Aachen
P. ShanahanMINOS Collaboration
2
MINOS
• Main Injector Neutrino Oscillation Search– Precision m2 and sin2(2) measurement
in disappearance
– Beam from Fermilab Main Injector: Mostly tuneable energy
– 2 detectors separated by 735km baseline• Near Detector: 1kt detector at Fermilab
• Far Detector: 5.4kt detector at Soudan
– Improved e limits
– At 735 km, SK m2 1-4 GeV oscillation maximum735 km
July 19, 2003 HEP03, Aachen
P. ShanahanMINOS Collaboration
3
NuMI Beam• Neutrinos at the Main Injector
– 120 GeV Protons from Fermilab Main Injector
– 10s pulse, every 1.9s
– Proton Intensity:
• 4x1013 protons/pulse design
• 2.5x1013 p/p expected at startup
– Hadrons focused with 2 horns
• Horn and target positionstune beam energy spectrum
Main Injector
Near Detector
470 events/kt-yr
1270 events/kt-yr
2740 events/kt-yr
Decay pipe:678m x 1m radius
Target, Horns
Rock: 240m,muon monitors
Hadron Absorber:4.7 m Al/Fe
103 m
1040 m
Not to scale
July 19, 2003 HEP03, Aachen
P. ShanahanMINOS Collaboration
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NuMI Beam Status• Excavation of underground complex
complete
• Decay Pipe installed• Tunnel/Hall Outfitting in progress
• Target has been fabricated
• Horns have been assembled
• Project will be complete/ commissioning starts Dec. 2004 MINOS Near Detector Hall
(100m underground)
Some of the NuMI Shielding -Much more than mass of Near and Far Detectors combined!
July 19, 2003 HEP03, Aachen
P. ShanahanMINOS Collaboration
5
NuMI Beam Status
Horn 2 Assembly
Decay Pipe
Decay Pipe encased in concrete to protect groundwater
July 19, 2003 HEP03, Aachen
P. ShanahanMINOS Collaboration
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Far Detector• 5.4kt total
– 484 planes in two ~14.5m long “super modules”
– Each plane 8m octagon
– 2.54cm Fe, 1cm Scintillator
– ~1.5T Magnetic field
• Readout– 2 ended readout
– 8x optical multiplexing into M16 multi-anode PMTs
– ~92k strips, 23k channels
• Overburden– 710 m (2090 mwe)
1 supermodule Magnet Coil
8m
July 19, 2003 HEP03, Aachen
P. ShanahanMINOS Collaboration
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Far Detector Status
Completed MINOS Far Detector
A person
• Far Detector construction completed!– 1st supermodule
operational since 7/02
• Veto Shield– Build from same
scintillator used in detector
– Help ID Atmospheric neutrino interactions
July 19, 2003 HEP03, Aachen
P. ShanahanMINOS Collaboration
8
Far Detector Data
X
Y
Z
• Up Going Muons: interactions below detector– Use timing to select up
going muons
• Magnetic Field– Distinguish +
Example: 5.4 GeV/c up going
Time vs. Y
Up Going log10(p) distributions MINOS
PRELIMINARY UPGOING MUON DATA
One sign
Other sign
July 19, 2003 HEP03, Aachen
P. ShanahanMINOS Collaboration
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Atmospheric Neutrinos• MINOS is 1st Large, Underground
detector with Magnetic Field– Distinguish from +
• vs.
– CPT test: P(P?
Expected number of events:
Number of events in Neutrino Antineutrino 24 kT yearsReconstructed contained 440 260 vertex with muonReconstructed upgoing muon 280 120
For m2=0.003 eV2, sin2 2 = 1.0
2 Probability for nominal neutrino oscillationparameters compared to different values of m2
for antineutrinos.
July 19, 2003 HEP03, Aachen
P. ShanahanMINOS Collaboration
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• Same sampling/structure as far detector
• 980 t
• High rate (10s spill)– HE beam: 20 interactions/m/spill– LE beam: 3.2 interactions/m/spill– High speed electronics– 4x multiplexing in spectrometer only
• All Planes have been assembled
Near Detector
July 19, 2003 HEP03, Aachen
P. ShanahanMINOS Collaboration
11
MINOS Event Topologies identified by in Charged Current interactions
CC NC
e CC
Example Monte Carlo eventsPulse height vs. Strip & plane4-5 GeV neutrinos
MIP energy loss = 30MeV/plane
1 plane 1.4 X0
Interaction length6 planes
1.2m
4.7m
~1.0m
0.7m
1.7m
July 19, 2003 HEP03, Aachen
P. ShanahanMINOS Collaboration
12C
C e
vent
s
Oscillation Measurement• Charged Current events
– Far detector observed/expectation for no oscillations
– Energy dependence yields oscillation parameters
• The Details…– Hadron production
• Unlike Far, Near Detector sees non-point source of neutrinos• MIPP - hadron production experiment at Fermilab
– Neutrino Cross sections– Detector response & Calibration
• 2% relative, 5% absolute• CALDET calibration detector at CERN• See C. Smith’s talk in detector session
Example
No osc.
m2=2x10-3 eV2 sin2(2)=0.9
July 19, 2003 HEP03, Aachen
P. ShanahanMINOS Collaboration
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5 Year Plan
• MINOS Collaboration has submitted a 5 year plan to Fermilab Physics Advisory Committee– Physics with beam
starts 2005
– Expect 2.5x1020
protons 1st year
– Request 25x1020
p.o.t total
MC with m2 = 0.0025 eV2, sin2 2 = 1.0
July 19, 2003 HEP03, Aachen
P. ShanahanMINOS Collaboration
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Electron Neutrino Appearance
For m2 = 0.0025 eV2, sin2 213= 0.067 For m2 = 0.0025 eV2
Observed number of e CC candidates with and without oscillations.25x1020 protons on target.
3 discovery potential for threedifferent levels of protons on targetand versus systematic uncertaintyon the background.
July 19, 2003 HEP03, Aachen
P. ShanahanMINOS Collaboration
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Summary
• MINOS – Main Injector Neutrino Oscillation Search– 1kt Near Detector at Fermilab, 5.4kt Far Detector at Soudan, MN
• disappearance– Demonstrate oscillatory energy dependence of effect– Precision measurements of m2, sin2(2) (10%)
• e appearance– Improved bounds on |Ue3|2
• Status– Far Detector construction complete– Beam tunnel and Near Detector hall complete
• Installation to start early 2004
• Physics starting April 2005
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