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MEG Summary

MEG Summary. T. Mori for MEG Collaboration. February 9, 2005. The MEG C ollaboration. 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

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MEG Summary

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  1. MEG Summary T. Mori for MEG Collaboration February 9, 2005

  2. 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/Pisa/KEK S.Mihara • Trigger: Pisa M.Grassi • DAQ/Elec.: PSI S.Ritt • Offline: C.Gatto/S.Yamada/F.Cei

  3. Highlights in developments sine July 2004 Beam line Separator, BTS in construction COBRA Fringing field problem ~solved LXe Beam test w/ new PMTs, waveform digitizers, and wire alpha sources Detector cryostat in construction

  4. Intrinsic from LR analysis target LYSO depth 110 - 64 - 61 = 65 = 56 + 33 psec Absolute time of LXe normal gain high gain 103 psec 110 psec 55 MeV

  5. Background and Sensitivity Jan 2004 Jan 2005 Gamma Energy (%) 4.5-5.0* e+ Timing (nsec) 0.1* Gamma Timing <0.23* ~0.15** Gamma Position (mm) 4.5-9.0* Gamma acceptance >0.4* Muon rate (108/sec) 0.2-0.3 0.25-0.35 Running Time (107sec) 4.0 Accidental Rate (10-14) 2.3-3.5 1.9-3.0 # Accidental Events 0.6 0.6 90% CL Limit (10-13) 1.2-1.7 0.9-1.4 * Measured **w/ new PMTs More detailed calculation necessary

  6. Schedule

  7. Changes (~delays) in schedule Beam line BTS construction LXe Detector cryostat construction PMT delivery new problem arising -- solution foreseen DC Troubles with cathode foil production

  8. Noise from Zener diode

  9. Manpower

  10. Mostly in healthy situation except: beam line + target Monte Carlo

  11. Budget

  12. We now have enough money for PMTs! a new budget for construction in Japan ~400 PMTs additional budget for ~110 PMTs in Italy Then new problems arising… LXe for last 300liters electronics LXe calibration equipment proton beam? PSI

  13. PREVIOUS eg EXPERIMENT 1982 !!

  14. NOW: GLAST SPACE EXPERIMENT CRYSTAL CALORIMETER CALIBRATION 180 cm target-pipe It is the old VDG of the Crystal Ball experiment ! ! they have some problems: old device, max. VDG p-energy is 400 KeV out of resonance: -rate reduced by factor  5000

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