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BMUON: Status Report

Luca Stanco - INFN Padova Krakow, 28 September 1999. BMUON: Status Report. Setup reminder Status of the Limited Streamer Tubes (LST) Triggers Efficiencies Y2K, online hang-up etc. Detector. BMUON. RMUON. Elettrons. Protons. BMUON detector.

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BMUON: Status Report

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  1. Luca Stanco - INFN Padova Krakow, 28 September 1999 BMUON: Status Report • Setup reminder • Status of the Limited Streamer Tubes (LST) • Triggers • Efficiencies • Y2K, online hang-up etc.

  2. Detector BMUON RMUON Elettrons Protons

  3. BMUON detector • ~ 3 600 LSTs(with lenght from 0.7 to 10.2 m) • ~43 000 8-bit analog channels • ~ 29 000 digital channels Area detector > 2 000 m2 Resolution:  1 mm in the “strip” view  3 mm in the “wire” view Technical Coordinator: Riccardo Brugnera Web-master: Vincenzo Chiochia

  4. LST Mortality... plus ~ 68 LST in trip for 10-40% of time plus ~ 10 LST in trip for 10-40% of time

  5. LST DeadLST’sarenormallyswitched off Simulation in the Monte Carlo via an EAZE job: to evaluateefficiency dependence (small effect: 5%) BMUON - MC ideal - - MC with dead LST efficiency RMUON

  6. BMUON Triggers Slot 8: Elastic Slot 10: InnerBMUON Slot 11: InnerRMUON Slot 14: OuterBMUON Slot 15: OuterRMUON FLT SLT Inner Outer TLT • GLOMU • GLOEXO

  7. FLT rates... 1 mb for L= 10*1030  10 Hz (most of the runs)

  8. GFLT with INNER chambers and with ISOMU: Calorimeter regions

  9. SLT rates INNER OUTER

  10. TLT GLOMU rates cosmics 30 nb for L= 10*1030  0.03 Hz

  11. Efficiencies independent setup: efficiency vs HV working value to reduce trips

  12. Efficiencies 100% HV: 4700 88% 100% HV: 4550 75% include inefficiency factor on single LSTin the Monte Carlo (15%)

  13. Efficiencies - MC ideal - - MC with dead LST and 15% factor for HV BMUON efficiency RMUON 15% inefficiency coherent with analysis of single track segment !

  14. Efficiencies ! Check efficiency with DATA themselves Two independent analysis on 2 track m+m- clean events (3 different set of events, depending of the trigger) BMUON SET 1 SET 2

  15. Efficiencies Monte Carlo is off of an overall factor ! A few investigations performed. Not yet found out the reason... … much more in Alessandro Bertolin’ talk this afternoon

  16. Some Technicalities ... Y2K • VMS computer for DAQ • patch from DEC (and spare mVAX from DELPHI available) • upgrade on going ... • Slow Control with OS9 (version 2.3 NOT good) • manual patch (bring time back, uff !) … • upgrade to 3.03 ?

  17. Some Technicalities ... Online problem while Aborting Run ? Time for Aborting as function of Run ...

  18. Some Technicalities ... Distribution of Time for Aborting ... for last positron runs...

  19. BMUON Summary • Good general behaviour of the detector • Triggers under control • Efficiency studies on the way on • Few upgrades needed for next millenium Good perspectives for next millenium Runs

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