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The MEG Experiment

The MEG Experiment. T. Mori for the MEG Collaboration. GUT, m n. m. e. g. MEG Physics. Clear signal of New Physics Never occurs in the Standard Model SUSY GUT promising Unification of 3 forces (LEP) Solar Neutrino mixing ( n m - n e ) is large SuperKamiokande, SNO, KamLAND

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The MEG Experiment

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  1. The MEG Experiment T. Mori for the MEG Collaboration

  2. GUT, mn m e g MEG Physics • Clear signal of New Physics • Never occurs in the Standard Model • SUSY GUT promising • Unification of 3 forces (LEP) • Solar Neutrino mixing (nm - ne) is large • SuperKamiokande, SNO, KamLAND • Seesaw mechanism • Muon (g-2) may be SUSY • And more…

  3. TheMEG Collaboration ICEPP, University of TokyoY. Hisamatsu,T. Iwamoto,T. Mashimo, S. Mihara, T. Mori, H. Nishiguchi, W. Ootani, K. Ozone, T. Saeki, R. Sawada, S. Yamada, S. Yamashita KEK, TsukubaT. Haruyama, A. Maki, Y. Makida, A. Yamamoto, K. Yoshimura Osaka UniversityY. Kuno Waseda UniversityT. Doke, J. Kikuchi, S. Suzuki, K. Terasawa, A. Yamaguchi, T. Yoshimura INFN & Genova UniversityS. Dussoni, F. Gatti, D. Pergolesi, R. Valle INFN & Lecce UniversityS. Spagnolo, C. Chiri, P. Creti, M. Panareo, G. Palama’ INFN & Pavia UniversityA.de Bari, P. Cattaneo, G. Cecchet, G. Nardo’, M. Rossella INFN & Pisa UniversityA. Baldini, C. Bemporad, F.Cei, M.Grassi, F. Morsani, D. Nicolo’, R. Pazzi, F. Raffaelli, F. Sergiampietri, G. Signorelli INFN Roma I D. Zanello PSI, VilligenJ. Egger, P. Kettle, M. Hildebrandt, S. Ritt Budker Institute, NovosibirskL.M. Barkov, A.A. Grebenuk, D.G. Grigoriev, B, Khazin, N.M. Ryskulov

  4. TheMEG Collaboration • Spokespersons: T.Mori, A.Baldini • Technical Coordinator: S.Ritt • Detectors: • Beam line: PSI P.-R.Kettle • COBRA: KEK/Tokyo W.Ootani • Drift Chamber: PSI J.Egger • Timing Counter: Genova/Pavia/Roma G. Cecchet • Photon Detector: Tokyo/KEK/Pisa S.Mihara • Trigger: Pisa M.Grassi • DAQ/Elec.: PSI S.Ritt • Offline: S.Yamada/F.Cei/P.Cattaneo

  5. The MEG Detector

  6. COBRA arrived at PSI! Placed in SLS hall for the initial test. The installation in πE5 is planned this April.

  7. Excitation Test at PSI Excitation test was done between Jan.17-27,2004. Full excitation for SC and 8% excitation for NC because of limited utility at SLS. Field mapping study is starting at SLS hall.

  8. COBRA Magnet Platform 2002 2003 2004 2005 Design Winding & Cryo. Ass. Test Deliv. PSI Test Field Measurement Design Manufactoring Assembly Test Milestone

  9. Trigger & DAQ optional wall electronics HV small rail LXe storage compressor LN2 line Experiment Area Layout Transport solenoid triplets separator 2003: established beam line design

  10. Beam 2002 2003 2004 2005 Studies Triplet I + II Solenoid BTS New Separator Target Part 1 Part 2 Beam Line Commissioning Design Manufactoring Assembly Test Milestone BTS + COBRA coupling being studied

  11. Drift Chamber • Final design • Know how to build it

  12. Positron Tracker 2002 2003 2004 2005 Full Prototype Beam test Medium Prototype Charge division & Cosmics Full Prototype FP FP Full Detector (18 DC) Design Manufactoring Assembly Test Milestone

  13. PM active diameter Minimal Cross Section 39x30 mm 60º PM section From COBRA center 105 cm 25 cm 8.5º 20º 20º 10º B B Timing Counter -Final design in progress -APD tests for Phi counters (trigger) -Tests under B field planned 0.75 T 1.05 T

  14. Design Manufactoring Assembly Test Milestone Timing Counter 2002 2003 2004 2005 2” Fine Mesh 19 dyn. R5924 PMT Evaluation Beam Test PMT procur. APD Evaluation APD procur. APD test Design Procur & Manuf. 5x5 mm APD Hmamatsu Assembly

  15. LXe Photon Detector Lead Collimator at the beam line exit Beam test at PiE1 in Sept-Dec 2003 Carbon degrader

  16. M/2(1cos*) * M/2 Photon spectrum 129 MeV 54.9 82.9 Elementary process M/2  - (essentially) at rest captured on protons:  - p  0 n  - p  n  0   Eg=55 MeV  * = 

  17. Energy measurement FWHM Background rejection Material, leakage

  18. ~4.5%

  19. center of F14 center of F20 center of the detector center of F15 center of F21 FWHM [%]

  20. #689[6-7], trigger:S1*Xe

  21. Laser-Compton scattering at TERAS 10, 20, 40MeV

  22. PSI 2003 TERAS 2003 alpha

  23. L-R timing resolution Sigma = 65 psec

  24. KSR measurement Of electron beam In 2002 • Resolution improves in proportion to 1/sqrt(Npe). • For 52.8 MeV g, s~60 psec + depth resolution. • QE improvement and wave-form analysis will help to achieve better resolution.

  25. electron E deposit/unit length gamma Depth (cm)

  26. Xe – TC timing resolution Sigma = 100 psec

  27. Position measurement

  28. Background and Sensitivity July 2002 Now Gamma Energy (%) 4.0-4.5 4.5-5.0* e+ Timing (nsec) 0.1* 0.1* Gamma Timing 0.1 <0.23* Gamma Position (mm) 9-10.5 4.5-9.0* Gamma acceptance 0.6 >0.4* Muon rate (108/sec) 0.2-0.3 0.2-0.3 Running Time (107sec) 2.6 4.0 Accidental Rate (10-14) 2.2-3.5 2.3-3.5 # Accidental Events 0.6 0.6 90% CL Limit (10-13) 1.0-1.6 1.2-1.7 * Measured More detailed calculation necessary

  29. QE abs=1 m abs= 5% 6% 2.0% 10% 6% 1.7% 20% 6% 1.5%

  30. Problems arising… - PMT instability - neutron background

  31. Photon Detector 2002 2003 2004 2005 Large Prototype Beam Test Beam Test Engineering runs Vessel Design Manufactoring Assembly & Test PMT Delivery + Testing Assembly Test Refrigerator Manufactoring Assembly Liq. Purification Design Manufactoring Assembly Test Milestone

  32. Trigger / DAQ / Electronics Prototype system tests • Debugging of the first board Type0 in Pisa • A minor error fixed • System assembled at PSI in Nov. ‘03 • 100MHz synchronous operation • Negligible transmission error rate • Satisfactory operation of the analog interface • Connection with the Large Prototype • PMT from #0 to #31 • Collected data • Alpha • Led • 0

  33. The boardType0 control signals. LVDS transm. Differential drivers PMT inputs FPGA FADC LVDS receiv. configuration EPROMS package error solved with a patch board

  34. Internal trigger Pulse time Output cyclic-buffer board 0 Input cyclic-buffer board 0 Amplitude [mV] Amplitude sum Index of Max Max. Amplitude (2) Time [10 ns]

  35. Trigger 2002 2003 2004 2005 Prototype Board Final Prototype Full System now Design Manufactoring Assembly Test Milestone

  36. Wave form digitizer - DRS PMC carrier board DRS 1st Prototype Joint effort with the MAGIC experiment (Uni. of Siena and INFN Pisa) • Clock control (locking to external source) • DRS readout with FADC • DRS control signals

  37. DRS (DAQ) 2002 2003 2004 2005 1st Prototype Tests 2nd Prototype Boards & Chip Test now Design Manufactoring Assembly Test Milestone

  38. Offline Software More people are joining the efforts now By May 2004: -Finish merging LXe geometry & scintillation tracking (Cei/Yamada) -ZEBRA framework for MC outputs (Cattaneo) By July 2004: -Detector digitization (TC:Paolo, XE: Yamada/Cei, DC: Nishiguchi) Unified MC available for the DC beam test in summer Coordination meeting planned in May-June

  39. Conclusion

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