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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!











Qdc for o vercount pixel
QDC for OverCount pixel



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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