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This analysis presents the normalized QDC for each pixel across datasets PP158 (2009, ~3.5 Mevents) and BeBe (2013, 13+30 GeV, ~7 Mevents). We identify good pixels, defined by hit counts within 8 sigma of neighboring pixels' averages, excluding zero, over-, and under-counts. The findings reveal that the right wall exhibits 20 dead and 41 suspicious pixels, while the left wall shows serious damage with 75 dead and 232 suspicious pixels. Most issues are attributed to broken or unglued PMTs, necessitating cassette repairs. A readout upgrade may be required.
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General Idea • Normalized QDC for each pixel • Data sets: • PP158 from 2009 (~3.5 Mevents) • BeBe from 2013 (13+30GeV, ~7Мevents) • We have histo for every pixel´s count where we can check all suspicious pixels • Good pixel: number of hits has to be in range of 8 sigma from average hits of neighbor pixels
Determination of good pixels For counting average hits from neighbor pixels, only GOOD pixels are included; Zero-, Over- and Under-Count are excluded!
Conclusion • Right wall still decent: 20 dead and 41 suspicious pixels • Left wall seriously damaged: 75 dead and 232 (!) suspicious pixels • Most probably reason: broken or unglued PMTs • Cannot be justify without opening cassettes • Almost all cassettes in the left wall need repairing! • Serious job: material (PMTs, scintillators), men work… • Question: do we need readout upgrade in this situation?
