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Stato dell’esperimento MEG
•Stato dell’esperimento (LXe, T.C., Trigger a parte)
• Schedule
• Budget
• MoU
• Richieste finanziarie
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Detector overview
• Liquid Xe e.m. calorimeter
• Magnetic spectrometer
• Timing counter
),/,( γγγγ tEpE
ep
),/( eee tEp
%9π4
ps 150
mrad 5.2017
%4
%9.070
eγ
eγ
γ
e
t
E
.E
FWHM resolutions
“espulsione” dei positroni
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INFN & Pisa University A. Baldini, C. Bemporad, F.Cei, M.Grassi, F. Morsani, D. Nicolo’, R. Pazzi, F. Raffaelli, F. Sergiampietri, G. Signorelli
ICEPP, University of Tokyo T. Mashimo, S. Mihara, T. Mitsuhashi, T. Mori, H. Nishiguchi, W. Ootani, K. Ozone, T. Saeki, R. Sawada, S. Yamashita
KEK, Tsukuba T. Haruyama, A. Maki, Y. Makida, A. Yamamoto, K. Yoshimura
Osaka University Y. Kuno
Waseda University T. Doke, J. Kikuchi, H. Okada, S. Suzuki, K. Terasawa, M. Yamashita, T. Yoshimura
Budker Institute, Novosibirsk L.M. Barkov, A.A. Grebenuk, D.G. Grigoriev, B, Khazin, N.M. Ryskulov
PSI, Villigen J. Egger, P. Kettle, H. Molte, S. Ritt
La collaborazione
INFN & Pavia University A.de Bari, P. Cattaneo, G. Cecchet, G. Nardo’, M. Rossella
INFN & Genova University S. Dussoni, F. Gatti, P. Ottonello, D. Pergolesi, R. Valle
INFN Roma I D. Zanello
INFN & Lecce University S. Spagnolo, C. Chiri, P. Creti, G. Palama’, M. Panareo
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Magnet: Construction finished!
• Construction was finished!Construction was finished!• Excitation test has started on June.Excitation test has started on June.
Compensation coilsCompensation coilsSuperconducting coil in cryostatSuperconducting coil in cryostat
PotentiometerPotentiometer
Support frameSupport frame
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Jan 2002:Jan 2002:
2002 2003 2004 2005
Jan 2003:Jan 2003: Test MilestoneAssemblyDesign Manufactoring
Design Ass. TestWinding & Cryo.
Deliv.PSI
Test
Field Measurement
Platform
COBRA Magnet schedule
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Platform design status (June 24th)
beam
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Area Layout
optional wall
small rail
electronics
LXestorage compressor
LN2 line
Trigger & DAQ
HV
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Measurements:Measurements: Phase B – post Triplet 2 & CollimatorPhase B – post Triplet 2 & Collimator Phase C – post SolenoidPhase C – post SolenoidSeveral unexpected problems encountered & Solved !!!Several unexpected problems encountered & Solved !!!
Measurements:Measurements: Phase B – post Triplet 2 & CollimatorPhase B – post Triplet 2 & Collimator Phase C – post SolenoidPhase C – post SolenoidSeveral unexpected problems encountered & Solved !!!Several unexpected problems encountered & Solved !!!
“Z-Branch” Measurements April/May2003
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Phase C Post Solenoid
Remember !!! PSC only a Test SolenoidRemember !!! PSC only a Test Solenoid
PSC-Solenoid 20cm BorePSC-Solenoid 20cm BoreBeam Line 32 cm BoreBeam Line 32 cm Bore
Remember !!! PSC only a Test SolenoidRemember !!! PSC only a Test Solenoid
PSC-Solenoid 20cm BorePSC-Solenoid 20cm BoreBeam Line 32 cm BoreBeam Line 32 cm Bore
Triplet 2Triplet 2
11
SolenoidSolenoidWIENWIEN
FilterFilter
ColliColli..TripTrip..µµ++
ee++ee++µµ++
Integrated RateIntegrated RateAfter SolenoidAfter Solenoid
4cm Tg.E @ 4cm Tg.E @ 18001800µAµA
NNµµ~6.1·10~6.1·1077 µ µ++/s/s(1.1·10(1.1·1088 µ+/s 6cm µ+/s 6cm
Tg.)Tg.)
Beam Spot:Beam Spot:σσXX ~ 5.3 mm ~ 5.3 mmσσYY~ 6.5 mm~ 6.5 mm
Transmission Transmission Factor SolenoidFactor Solenoid
TTSolSol= 71 %= 71 %
Integrated RateIntegrated RateAfter SolenoidAfter Solenoid
4cm Tg.E @ 4cm Tg.E @ 18001800µAµA
NNµµ~6.1·10~6.1·1077 µ µ++/s/s(1.1·10(1.1·1088 µ+/s 6cm µ+/s 6cm
Tg.)Tg.)
Beam Spot:Beam Spot:σσXX ~ 5.3 mm ~ 5.3 mmσσYY~ 6.5 mm~ 6.5 mm
Transmission Transmission Factor SolenoidFactor Solenoid
TTSolSol= 71 %= 71 %
Single Node SNMSingle Node SNMSingle Node SNMSingle Node SNM
Double Node DNMDouble Node DNMDouble Node DNMDouble Node DNM
Previous Excitation Previous Excitation Curve DNM confirmedCurve DNM confirmed DNM focus ZDNM focus Z00 14.53 A 14.53 APrevious U-Branch Previous U-Branch 14.56 A14.56 A With larger Bore i.e. BTS T>71%With larger Bore i.e. BTS T>71%
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Degrader & Stopping Distribution Measurements
µµ++
CHCH2 2 TgTg
ee++Foils CHFoils CH22
at focusat focus
Michel Range Curve using NaI:Michel Range Curve using NaI:
Measurement Measurement Simulation SimulationFix Degrader 600 µ Fix Degrader 600 µ Geant say 580µGeant say 580µNearly all Stopped in 400µNearly all Stopped in 400µ
R ~ 870 R ~ 870 µ CHµ CH22
DegraderDegrader
TargetTarget
AIRAIR
Target Thickness vs. NaI RateTarget Thickness vs. NaI Rate
VACVAC
TargetTarget
GivesGives RRMeanMean = 1150 = 1150µµEquiv GEANT + TRIMEquiv GEANT + TRIM88% STOP in 400µ 88% STOP in 400µ Tg !!!Tg !!!
SolenoidSolenoid
Fix DegraderFix DegraderVar. TgVar. Tg
88% stopped88% stoppedin 400in 400µ CHµ CH22 Tg. Tg.
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Jan 2002Jan 2002
2002 2003 2004 2005
Jan 2003:Jan 2003: Test MilestoneAssemblyDesign Manufactoring
Studies
Solenoid
Quadrupoles
Target
Beam
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Drift chambers
•Prototypes of cathodes supporting structure
•Print foils meeting the experimental requirements found
•Tests at M1: drift time measurements and cathodes read-out
•First studies on pattern recognition (Pisa + Lecce)
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Example of reconstructed tracksExample of reconstructed tracks
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# of # of correctly reconstructed trackscorrectly reconstructed tracks EfficiencyEfficiency = = —————————————————————————————— # of # of generated tracksgenerated tracks
Mean number of Efficiency on Efficiency on
mixed tracks first turn second turn
None 1 98.2 98.5Poisson 5 95 98.4Fixed 5 95.8 98.1
Poisson 10 91 97.5Fixed 10 92.1 97.5
Mixing
Michel positronsMichel positrons in the solid anglein the solid angle covered by the covered by the spectrometer spectrometer or or isotropicallyisotropically over the whole detector; over the whole detector; no no significant differencessignificant differences; ; positron momentumpositron momentum > 30 MeV> 30 MeV;;
Algorithm performancesAlgorithm performances
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2002 2003 2004 2005
Test MilestoneAssemblyDesign Manufactoring
Full Prototype
Medium PrototypeCharge division & Cosmics
FP FP
Full Detector (18 DC)
Jan 2002:Jan 2002: Positron Tracker
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2002 2003 2004 2005
Test MilestoneAssemblyDesign Manufactoring
Design
PMT Evaluation PMT
Jan 2002:Jan 2002: Timing Counter
•Tests of fine mesh PMTs (even in magnetic fields) and of counter prototypes (M1) going on
•Good solution for transverse detector: scintillating fibers + APDs
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Photon Detector schedule
2002 2003 2004 2005
Test MilestoneAssemblyDesign Manufactoring
Large Prototype Beam Test Beam Test
Vessel Design Assembly & Test
PMT Delivery + Testing
Refrigerator Manufactoring Assembly
Liq. Purification
Assembly Test
Manufactoring
Engineering runs
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Electronics
•Need of at least two prototypes (both for the trigger and the DRS)
•First trigger prototype is being tested
•Second DRS design is being designed
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Full System
2002 2003 2004 2005
Test MilestoneAssemblyDesign Manufactoring
Prototype Board
2nd Prototype
Jan 2002Jan 2002 Trigger
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2002 2003 2004 2005
Test MilestoneAssemblyDesign Manufactoring
2nd Prototype
Tests1st Prototype
Boards & Chip Test
Jan 2002Jan 2002 DRS (DAQ)
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2002 2003 2004 2005
Test MilestoneAssemblyDesign Manufactoring
Platform
DetectorIntegration
EngineeringRuns
Jan 2002:Jan 2002: Complete Detector
•Start of the experiment in 2006
•All possible engineering runs in 2005
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Budget (K€)
Calorimeter PMT 1756Lxe 845Vessel 400Various items 271Xe system 369Cobra Magnet 1175
Timing counter 700Trigger 400
Drift Chambers 149Muon transport 184DAQ Electronics 405Detector 172HV 39
6865
Japan 2529Italy 2200PSI 1299
6028
Running costs - 2008 1303
Approved in aprilApproved in may
2003-2005
Deficit per 350 PMT
MoU
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LXenon
• PMT(300) 550 K€
• Criostato 400 K€
Trigger
• Secondo prototipo 20 K€
• Sistema completo 430 K€
Timing counter
• APD + fibre (interno) 160 K€
• PMT (100: esterno) 315 K€
• Scintillatore 50 K€
• Calibrazione 100 K€
• Meccanica 50 K€
675 K€
Splitters
• Sistema completo 115 K€
TOTALE 2190 K€
1095 K€
545 K€
550 K€
Stime di costo aggiornateStime di costo aggiornate
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Preventivo globale
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Preventivo 2004
38 315 66 20 261 1836 2536TotTot
Settembre 2003
• PMT LXe 550 K€
• APD 80 K€
• Scint T.C. 50 K€
680 K€
Prima meta’ 2004
• PMT T.C. 315 K€
• fibre 80 K€
• Criostato 400 K€
• Splitters 1 50 K€
845 K€
Seconda meta’ 2004
• Trigger 1 215 K€
• Calibr. T.C. 100 K€
• Mecc. T.C. 65 K€
380 K€
2005
• Trigger 2 215 K€
• Splitters 1 50 K€
265 K€
Proposta ...
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Milestones 2004
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