VTX stability study Hidemitsu Asano.

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Presentation transcript:

VTX stability study Hidemitsu Asano

QA files for stability study -QA modules SvxQAForProduction SvxStripClusterQA histograms are generated segment by segment (not aggregated) -idea- calculates number of clusters/event sensor by sensor and finds unstable sensors run by run datasets : run11 AuAu 200GeV

example B0L0 run347128 sensor 0 sensor 1 sensor 2 sensor 3 sensor 4 sensor 5 unstable ! pixel hit rate = (# of clusters) / (# of bbc events within +- 10cm ) stripixel hit rate = (# of clusters) / (# of bbc events within +-15cm )

B0 west run 347128

B0 east

B1 west

B1 east

B2 west

B2 east

B3 west

B3 east

unstable flag for each sensor 1. use segment # 0000 – # 0004 and calculate average hit rate sensor by sensor. (=firsthitrate) 2. scan hit rate for all segment (sensor by sensor) if ( hit rate < 0.80*firsthitrate || 1.03*firsthitrate < hit rate ) badsegment++; …. if(badsegment>2) the sensor is marked as “unstable”

marked as unstable sensor run 347128 phi z segment #0100 segment #0000

phi z segment #0000 segment #0100

segment #0000 segment #0100

segment #0000 segment #0100

outlook -plan optimize threshold for unstable sensor flag and scan all data. unstable sensor flag will be determined run by run Those unstable sensor flag will be used for RP(VTX) analysis .

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