1 A.Baldini 23 sett CSN I Lecce Stato dellesperimento MEG Stato dellesperimento (LXe, T.C., Trigger...

A. Baldini 23 sett CSN I Lecce

1

Stato dell’esperimento MEG

•Stato dell’esperimento (LXe, T.C., Trigger a parte)

• Schedule

• Budget

• MoU

• Richieste finanziarie


2

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


3

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


4

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


5

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


6

Platform design status (June 24th)

beam


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Area Layout

optional wall

small rail

electronics

LXestorage compressor

LN2 line

Trigger & DAQ

HV


8

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


9

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

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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


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


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


Prototype Board

2nd Prototype

Jan 2002Jan 2002 Trigger


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2002 2003 2004 2005


2nd Prototype

Tests1st Prototype

Boards & Chip Test

Jan 2002Jan 2002 DRS (DAQ)


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2002 2003 2004 2005


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

1 A.Baldini 23 sett CSN I Lecce Stato dellesperimento MEG Stato dellesperimento (LXe, T.C., Trigger...

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