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General Idea
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Faculty of Physics, University of Belgrade
General meeting 3rd of June, 2014.
ToF-L/R Performance
Marjan Ćirković,Faculty of Physics, Belgrade
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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
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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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Faculty of Physics, University of Belgrade
General meeting, 03.06.2014.Page 4 out of 16Marjan Ćirković, Belgrade SHINE team
Normalized QDC for ToF-L
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Faculty of Physics, University of Belgrade
General meeting, 03.06.2014.Page 5 out of 16Marjan Ćirković, Belgrade SHINE team
Normalized QDC for ToF-R
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Faculty of Physics, University of Belgrade
General meeting, 03.06.2014.Page 6 out of 16Marjan Ćirković, Belgrade SHINE team
Pixel’s hits for pp158
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Faculty of Physics, University of Belgrade
General meeting, 03.06.2014.Page 7 out of 16Marjan Ćirković, Belgrade SHINE team
Pixel’s status
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Faculty of Physics, University of Belgrade
General meeting, 03.06.2014.Page 8 out of 16Marjan Ćirković, Belgrade SHINE team
Pixel’s status
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Faculty of Physics, University of Belgrade
General meeting, 03.06.2014.Page 9 out of 16Marjan Ćirković, Belgrade SHINE team
Pixel’s status
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Faculty of Physics, University of Belgrade
General meeting, 03.06.2014.Page 10 out of 16Marjan Ćirković, Belgrade SHINE team
Pixel’s status
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Faculty of Physics, University of Belgrade
General meeting, 03.06.2014.Page 11 out of 16Marjan Ćirković, Belgrade SHINE team
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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Faculty of Physics, University of Belgrade
General meeting, 03.06.2014.Page 12 out of 16Marjan Ćirković, Belgrade SHINE team
QDC for good pixel
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Faculty of Physics, University of Belgrade
General meeting, 03.06.2014.Page 13 out of 16Marjan Ćirković, Belgrade SHINE team
QDC for OverCount pixel
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Faculty of Physics, University of Belgrade
General meeting, 03.06.2014.Page 14 out of 16Marjan Ćirković, Belgrade SHINE team
QDC for UnderCount pixel
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Faculty of Physics, University of Belgrade
General meeting, 03.06.2014.Page 15 out of 16Marjan Ćirković, Belgrade SHINE team
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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Faculty of Physics, University of Belgrade
General meeting, 03.06.2014.Page 16 out of 16Marjan Ćirković, Belgrade SHINE team
Thank you!