1 Luca Stanco - INFN Padova Krakow, 28 September 1999 Setup reminder Status of the Limited Streamer...

1 Luca Stanco - INFN Padova

Luca Stanco - INFN PadovaKrakow, 28 September 1999

Setup reminder Status of the Limited Streamer Tubes (LST) Triggers Efficiencies Y2K, online hang-up etc.


Elettrons

Protons

RM

UO

N

BMUON


~ 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

Technical Coordinator: Riccardo Brugnera

Web-master: Vincenzo Chiochia

Resolution: 1 mm in the “strip” view 3 mm in the “wire” view


Mortality...

year BMUI BMUO RMUI RMUO Total Ch72

1994 78 59 41 23 201 34

1995 - - - - - -

1996 78 59 42 23 202 36

1997 79 59 45 33 216 25

1998 81 66 50 41 238 25

1999 81/708 66/1502 50/480 41/704 238/3394 25/184

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

plus ~ 10 LST in trip for 10-40% of time


DeadDead LSTLST’s are normallynormally switched offswitched off

SimulationSimulation in the in the Monte CarloMonte Carlo via an via an EAZEEAZE job: job:

to evaluate efficiencyefficiency dependence (small effect: 5%)

effi

cien

cy

BMUON

RMUON

- MC ideal- - MC with dead LST


Slot 8: Elastic Slot 10: Inner BMUONBMUONSlot 11: Inner RMUONRMUONSlot 14: Outer BMUONBMUONSlot 15: Outer RMUONRMUON

• GLOMU• GLOEXO

InnerOuter


rates...

1 b for L = 10*1030 10 Hz (most of the runs)


with INNER chambers

and with ISOMU: Calorimeter regions


rates

INNER

OUTER


GLOMU rates

30 nb for L = 10*1030 0.03 Hz

cosmics


independent setup: efficiency vs HV

working value to reduce trips


HV: 4700

HV: 4550

include inefficiency factor on single LSTin the Monte Carlo (15%)

100%

100%

88%

75%


- MC ideal- - MC with dead LST and 15% factor for HV

effi

cien

cy

BMUON

RMUON

15% inefficiency coherent with analysis of single track segment !


Check efficiencyefficiency with DATADATA themselves !Two independent analysis on 2 track +- clean events

(3 different set of events, depending of the trigger)

BMUON

SET 1

SET 2


… much more in Alessandro Bertolin’ talk

this afternoon

Monte Carlo is off of an overall factor !

A few investigations performed.A few investigations performed.Not yet found out the reason...Not yet found out the reason...


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 ?


Time for AbortingAborting as function of RunRun ...

problem while Aborting Run ?


Distribution of Time for Aborting Aborting ...

for last positron runs...


• 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

1 Luca Stanco - INFN Padova Krakow, 28 September 1999 Setup reminder Status of the Limited Streamer...

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