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Peter Kody š , Zde ň ka Broklov á , Zden ě k Dole ž al, Pavel Ř ezn íč ek

Preliminary Analysis And Common Mode Investigation TestBeam May 2002. Peter Kody š , Zde ň ka Broklov á , Zden ě k Dole ž al, Pavel Ř ezn íč ek. Institute of Particle and Nuclear Physics Charles University Prague. Common Noise Effects In Testbeam?.

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Peter Kody š , Zde ň ka Broklov á , Zden ě k Dole ž al, Pavel Ř ezn íč ek

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  1. Preliminary Analysis And Common Mode Investigation TestBeam May 2002 Peter Kodyš, Zdeňka Broklová, Zdeněk Doležal, Pavel Řezníček Institute of Particle and Nuclear Physics Charles University Prague

  2. Common Noise Effects In Testbeam? • Special Run 4484, threshold 0.3fC, Occupancy 40% 7/6/2002 • chips: 25-80% • Problem: Incorrect stream identification observed Readout problem?

  3. TestBeam ReadOut Analysis Plot • In practice: hits belonging to one stream were found in another stream instead Interstream transfer Interstream transfer Hit cumulating Empty events • Observed only in extremely high occupancy

  4. Basic Conditions 1 For Analysis • Scan “I” Run 4382-4399, 3/6/2002 • Run contains 20kEvents, 13kEvt for noise analysis, 2.4kEvt for eff • Edge Off • Bias 150 V (unirradiated) 350 V (irradiated) • Analysis for each chip, 9 interstrip positions (Eta study) • Threshold was corrected by chips cap correction of Qcal • Focus to modules (representative sample for quick analysis): • Irradiated k5_308, k5_305 • Unirradiated k5_302, 0046 (barrel) • Bad channels: k5_308: 14, k5_305:13+27, k5_302: 1 0046: 1

  5. Basic Conditions 2 For Analysis • Efficiency & Cluster Size • Exclude events with more tracks • Exclude events with high track uncertainty • Exclude events with Bad Channel in track region • Exclude events with more hits in the same place (readout bug) • Exclude events with no hit in any plane for Thr < 1.3 (readout bug) • Exclude events with TimeBin out of possible value (readout bug) • Exclude events with no anchor0 & anchor1 (plane 0 & 1) • 5ns TDC cut window –for each run, each stream • Noise Occupancy • Only hits in first TimeBin • Only hits out of track region + 1mm

  6. Efficiency vs Qth - Scurves

  7. Cluster Size vs Qth

  8. Noise Occupancy vs Qth

  9. Summary * irradiated

  10. Preliminary Conclusions • No real common noise effects observed for threshold range used • Readout problems observed for very high occupancy (lost or mixed hits between streams) (any other experience with readout of 11 modules in one system?) • Preliminary results from second independent analysis agree withValencia analysis • Current information about status of Prague offline & analysis is in: • http://www-ucjf.troja.mff.cuni.cz/~kodys/Work/TBMay2002/TBMay2002.html

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