Faculty of Physics, University of Belgrade

General meeting 3rd of June, 2014.

ToF-L/R Performance

Marjan Ćirković,Faculty of Physics, Belgrade

Faculty of Physics, University of Belgrade

General meeting, 03.06.2014.Page 2 out of 16Marjan Ćirković, Belgrade SHINE team

General Idea

• Normalized QDC for each pixel• Data sets:

– PP158 from 2009 (~3.5 Mevents)– BeBe from 2013 (13+30 GeV, ~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

Faculty of Physics, University of Belgrade

General meeting, 03.06.2014.Page 3 out of 16Marjan Ćirković, Belgrade SHINE team

Determination of good pixels

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

Count are excluded!

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Normalized QDC for ToF-L

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Normalized QDC for ToF-R

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Pixel’s hits for pp158

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Pixel’s status

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Pixel’s status

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Pixel’s status

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Pixel’s status

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Overall statistic

Left Wall Right Wall

DataSet Good Pixels ZeroCount UnderCount OverCount Good Pixels ZeroCount UnderCount OverCount

pp158(2009) 821 68 1 1 786 44 61 0

(13+30)BeBe(2013) 584 75 107 125 830 20 33 8

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QDC for good pixel

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QDC for OverCount pixel

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QDC for UnderCount pixel

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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?

Faculty of Physics, University of Belgrade

General meeting, 03.06.2014.Page 16 out of 16Marjan Ćirković, Belgrade SHINE team

Thank you!