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Luminosity Monitor MWPCs, test beam 22 results. A.Kiselev OLYMPUS Collaboration Meeting DESY, Hamburg, 27.06.2011
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Original motivation Test new MWPC modules Check PCOS4 readout integration in Bonn DAQ Check mechanical co-existence with the GEM modules Try out combined GEM-MWPC tracking?
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DORIS test run -> test beam 22 Lead Glass Calorimeter MWPC#1,2 with the onboard electronics 2x prop.chambers (1mm spacing, XUV) 864 channels total modern CROS3 electronics (Gatchina) ~1/3 of the final setup!
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DORIS test run (April’2011 slide) almost no noise clear timing correlation with the trigger very low leakage currents (few A at most) rather low hit multiplicities no sensitivity to synchrotron background on-board electronics works fine in “partly off-board” configuration useful acceptance ~105x105mm 2 confirmed relatively low efficiency (~95%) last Feb’2011 run #285: ~60mA after injection, Bhabha electrons flux ~700kHz:
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MWPC efficiency: HV scan all 6 planes U1..V2 at CROS3 threshold 40 efficiency plateau starts at ~3500V
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MWPC efficiency: threshold scan all 6 planes U1..V2 at 3500V will determine the actual threshold based on the noise conditions in the experiment
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Summary Two new MWPC modules tested Electronics checked under routine operation MWPC efficiency confirmed to be well above 99%
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