peter kodyš, sct week valencia, juni 13, 2002 peter.kodys@mff.cuni.cz1...
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Peter Kodyš, SCT Week Valencia, Juni 13, 2002peter.kodys@mff.cuni.cz 1 http://www-ucjf.troja.mff.cuni.cz/~kodys/Work/TBMay2002/TBMay2002.html
Charles University
Prague
Peter Kodyš, Zdeňka Broklová, Zdeněk Doležal, Pavel Řezníček
Institute of Particle and Nuclear Physics Charles University
Prague
Preliminary Analysis And Common Mode Investigation
TestBeam May 2002
Peter Kodyš, SCT Week Valencia, Juni 13, 2002peter.kodys@mff.cuni.cz 2 http://www-ucjf.troja.mff.cuni.cz/~kodys/Work/TBMay2002/TBMay2002.html
Charles University
PragueCommon 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?
Peter Kodyš, SCT Week Valencia, Juni 13, 2002peter.kodys@mff.cuni.cz 3 http://www-ucjf.troja.mff.cuni.cz/~kodys/Work/TBMay2002/TBMay2002.html
Charles University
PragueTestBeam ReadOut Analysis Plot
Hit cumulating Empty events
Interstream transferInterstream transfer
•In practice: hits belonging to one stream were found in another stream instead
•Observed only in extremely high occupancy
Peter Kodyš, SCT Week Valencia, Juni 13, 2002peter.kodys@mff.cuni.cz 4 http://www-ucjf.troja.mff.cuni.cz/~kodys/Work/TBMay2002/TBMay2002.html
Charles University
PragueBasic 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
Peter Kodyš, SCT Week Valencia, Juni 13, 2002peter.kodys@mff.cuni.cz 5 http://www-ucjf.troja.mff.cuni.cz/~kodys/Work/TBMay2002/TBMay2002.html
Charles University
Prague
•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
Basic Conditions 2 For Analysis
Peter Kodyš, SCT Week Valencia, Juni 13, 2002peter.kodys@mff.cuni.cz 6 http://www-ucjf.troja.mff.cuni.cz/~kodys/Work/TBMay2002/TBMay2002.html
Charles University
PragueEfficiency vs Qth - Scurves
Peter Kodyš, SCT Week Valencia, Juni 13, 2002peter.kodys@mff.cuni.cz 7 http://www-ucjf.troja.mff.cuni.cz/~kodys/Work/TBMay2002/TBMay2002.html
Charles University
PragueCluster Size vs Qth
Peter Kodyš, SCT Week Valencia, Juni 13, 2002peter.kodys@mff.cuni.cz 8 http://www-ucjf.troja.mff.cuni.cz/~kodys/Work/TBMay2002/TBMay2002.html
Charles University
PragueNoise Occupancy vs Qth
Peter Kodyš, SCT Week Valencia, Juni 13, 2002peter.kodys@mff.cuni.cz 9 http://www-ucjf.troja.mff.cuni.cz/~kodys/Work/TBMay2002/TBMay2002.html
Charles University
PragueSummary
Module Eff
@ 1fC
Eff
@ 1fC
best chip
Threshold
@ 99% Eff
Median Point
[fC]
Noise Occup
@ 1fC
Noise Occ
@ 1fC
best chip
Threshold
@ 5 e-4 Noise Occ
K5_302 S0 .995 1.0 1.7 3.3 5.9 e-5 4.1 e-5 0.8
K5_302 S1 .998 1.0 1.65 3.4 8.3 e-5 5.9 e-5 0.9
K5_308 S0 * .990 1.0 1.5 2.3 3.2 e-3 9.1 e-4 1.2
K5_308 S1 * .993 1.0 1.25 2.9 5.7 e-3 2.3 e-3 1.18
K5_305 S0 * .980 1.0 0.95 2.5 9.9 e-3 3.7 e-3 1.19
K5_305 S1 * .991 1.0 1.0 2.5 8.2 e-3 2.4 e-3 1.2
0046 S0 .999 1.0 1.75 3.4 7.1 e-5 4.5 e-5 -
0046 S1 .995 1.0 1.7 3.5 6.7 e-5 5.0 e-5 0.75
* irradiated
Peter Kodyš, SCT Week Valencia, Juni 13, 2002peter.kodys@mff.cuni.cz 10 http://www-ucjf.troja.mff.cuni.cz/~kodys/Work/TBMay2002/TBMay2002.html
Charles University
PraguePreliminary 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 with
Valencia 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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