peter kodyš, sct week valencia, juni 13, 2002 [email protected]...

Peter Kodyš, SCT Week Valencia, Juni 13, [email protected] 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


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?


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


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


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


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PragueEfficiency vs Qth - Scurves


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PragueCluster Size vs Qth


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PragueNoise Occupancy vs Qth


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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


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

peter kodyš, sct week valencia, juni 13, 2002 [email protected]...

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