1 A.Baldini 23 sett CSN I Lecce Stato dellesperimento MEG Stato dellesperimento (LXe, T.C., Trigger a parte) Schedule Budget MoU Richieste finanziarie

2 A.Baldini 23 sett CSN I Lecce Detector overview Liquid Xe e.m. calorimeter Magnetic spectrometer Timing counter FWHM resolutions espulsione dei positroni

3 A.Baldini 23 sett CSN I Lecce 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 A.Baldini 23 sett CSN I Lecce Magnet: Construction finished! Construction was finished! Construction was finished! Excitation test has started on June. Excitation test has started on June. Compensation coils Superconducting coil in cryostat Potentiometer Support frame

5 A.Baldini 23 sett CSN I Lecce Jan 2002: Jan 2003: Test Milestone AssemblyDesignManufactoring DesignAss.TestWinding & Cryo. Deliv. PSI Test Field Measurement Platform COBRA Magnet schedule

6 A.Baldini 23 sett CSN I Lecce Platform design status (June 24 th ) beam

7 A.Baldini 23 sett CSN I Lecce Area Layout optional wall small rail electronics LXe storage compressor LN 2 line Trigger & DAQ HV

8 A.Baldini 23 sett CSN I Lecce Measurements: Phase B – post Triplet 2 & Collimator Phase B – post Triplet 2 & Collimator Phase C – post Solenoid Phase C – post Solenoid Several unexpected problems encountered & Solved !!! Measurements: Phase B – post Triplet 2 & Collimator Phase B – post Triplet 2 & Collimator Phase C – post Solenoid Phase C – post Solenoid Several unexpected problems encountered & Solved !!! Z-Branch Measurements April/May2003

9 A.Baldini 23 sett CSN I Lecce Phase C Post Solenoid Remember !!! PSC only a Test Solenoid PSC-Solenoid 20cm Bore Beam Line 32 cm Bore Remember !!! PSC only a Test Solenoid PSC-Solenoid 20cm Bore Beam Line 32 cm Bore Triplet 2 1 Solenoid WIEN Filter Colli. Trip. µ+µ+µ+µ+ e+e+e+e+ e+e+e+e+ µ+µ+µ+µ+ Integrated Rate After Solenoid 4cm 1800µA N µ ~6.1·10 7 µ + /s (1.1·10 8 µ+/s 6cm Tg.) Beam Spot: σ X ~ 5.3 mm σ Y ~ 6.5 mm Transmission Factor Solenoid T Sol = 71 % Integrated Rate After Solenoid 4cm 1800µA N µ ~6.1·10 7 µ + /s (1.1·10 8 µ+/s 6cm Tg.) Beam Spot: σ X ~ 5.3 mm σ Y ~ 6.5 mm Transmission Factor Solenoid T Sol = 71 % Single Node SNM Double Node DNM Previous Excitation Curve DNM confirmed DNM focus Z A DNM focus Z A Previous U-Branch A A With larger Bore i.e. BTS T>71%

10 A.Baldini 23 sett CSN I Lecce Degrader & Stopping Distribution Measurements µ+µ+µ+µ+ CH 2 Tg e+e+e+e+ Foils CH 2 at focus Michel Range Curve using NaI: Measurement Simulation Fix Degrader 600 µ Geant say 580µ Nearly all Stopped in 400µ R ~ 870 µ CH 2 Degrader Target AIR Target Thickness vs. NaI Rate VAC Target Gives R Mean = 1150µ Equiv GEANT + TRIM 88% STOP in 400µ Tg !!! Solenoid Fix Degrader Var. Tg 88% stopped in 400µ CH 2 Tg.

11 A.Baldini 23 sett CSN I Lecce Jan Jan 2003: Test Milestone AssemblyDesignManufactoring Studies Solenoid Quadrupoles Target Beam

12 A.Baldini 23 sett CSN I Lecce 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)

13 A.Baldini 23 sett CSN I Lecce Example of reconstructed tracks

14 A.Baldini 23 sett CSN I Lecce # of correctly reconstructed tracks # of correctly reconstructed tracks Efficiency = Efficiency = # of generated tracks # of generated tracks Michel positrons in the solid angle covered by the spectrometer or isotropically over the whole detector; no significant differences; positron momentum > 30 MeV; Algorithm performances

15 A.Baldini 23 sett CSN I Lecce Test Milestone AssemblyDesignManufactoring Full Prototype Medium PrototypeCharge division & Cosmics FP Full Detector (18 DC) Jan 2002: Positron Tracker

16 A.Baldini 23 sett CSN I Lecce Test Milestone AssemblyDesignManufactoring Design PMT EvaluationPMT 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

17 A.Baldini 23 sett CSN I Lecce Photon Detector schedule Test Milestone AssemblyDesignManufactoring Large PrototypeBeam Test Vessel DesignAssembly & Test PMT Delivery + Testing RefrigeratorManufactoringAssembly Liq. Purification AssemblyTest Manufactoring Engineering runs

18 A.Baldini 23 sett CSN I Lecce 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

19 A.Baldini 23 sett CSN I Lecce Full System Test Milestone AssemblyDesignManufactoring Prototype Board 2 nd Prototype Jan 2002 Trigger

20 A.Baldini 23 sett CSN I Lecce Test Milestone AssemblyDesignManufactoring 2 nd Prototype Tests1 st Prototype Boards & ChipTest Jan 2002 DRS (DAQ)

21 A.Baldini 23 sett CSN I Lecce Test Milestone AssemblyDesignManufactoring Platform Detector Integration Engineering Runs Jan 2002: Complete Detector Start of the experiment in 2006 All possible engineering runs in 2005

22 A.Baldini 23 sett CSN I Lecce Budget (K) Approved in april Approved in may Deficit per 350 PMT MoU

23 A.Baldini 23 sett CSN I Lecce 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 Calibrazione100 K Meccanica 50 K 675 K Splitters Sistema completo 115 K TOTALE 2190 K 1095 K 545 K 550 K Stime di costo aggiornate

24 A.Baldini 23 sett CSN I Lecce Preventivo globale

25 A.Baldini 23 sett CSN I Lecce Preventivo Tot 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 K Calibr. T.C. 100 K Mecc. T.C. 65 K 380 K 2005 Trigger K Splitters 1 50 K 265 K Proposta...

26 A.Baldini 23 sett CSN I Lecce Milestones 2004