3 Luca Stanco - INFN Padova ~ 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 m 2 Technical Coordinator: Riccardo Brugnera Web-master: Vincenzo Chiochia Resolution: 1 mm in the strip view 3 mm in the wire view
4 Luca Stanco - INFN Padova Mortality... plus ~ 68 LST in trip for 10-40% of time plus ~ 10 LST in trip for 10-40% of time
5 Luca Stanco - INFN Padova Dead LST normally switched off Dead LST s are normally switched off Simulation in the Monte Carlo via an EAZE job: via an EAZE job: efficiency to evaluate efficiency dependence (small effect: 5%) efficiency BMUON RMUON - MC ideal - - MC with dead LST
10 Luca Stanco - INFN Padova GLOMU rates 30 nb for L = 10*10 30 0.03 Hz cosmics
11 Luca Stanco - INFN Padova independent setup: efficiency vs HV working value to reduce trips
12 Luca Stanco - INFN Padova HV: 4700 HV: 4550 include inefficiency factor on single LSTin the Monte Carlo (15%) 100% 88% 75%
13 Luca Stanco - INFN Padova - MC ideal - - MC with dead LST and 15% factor for HV efficiency BMUON RMUON 15% inefficiency coherent with analysis of single track segment !
14 Luca Stanco - INFN Padova efficiencyDATA Check efficiency with DATA themselves ! Two independent analysis on 2 track + - clean events (3 different set of events, depending of the trigger) BMUON SET 1 SET 2
15 Luca Stanco - INFN Padova … much more in Alessandro Bertolin talk this afternoon Monte Carlo is off of an overall factor ! A few investigations performed. Not yet found out the reason...
16 Luca Stanco - INFN Padova VMS computer for DAQ patch from DEC (and spare VAX 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 Luca Stanco - INFN Padova AbortingRun Time for Aborting as function of Run... problem while Aborting Run ?
18 Luca Stanco - INFN Padova Aborting Distribution of Time for Aborting... for last positron runs...
19 Luca Stanco - INFN Padova 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