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General Idea. Normalized QDC for each pixel Data set s : PP158 from 2009 (~3.5 Mevents ) BeBe from 201 3 (13 +30 GeV , ~7М events) We have histo for every pixel´s count where we can check all suspicious pixels

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general idea
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
Determination of good pixels

For counting average hits from neighbor pixels, only GOOD pixels are included; Zero-, Over- and Under-Count are excluded!

conclusion
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?
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