General Idea

Faculty of Physics, University of Belgrade

General meeting 3rd of June, 2014.

ToF-L/R Performance

Marjan Ćirković,Faculty of Physics, Belgrade


General meeting, 03.06.2014. 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



Determination of good pixels

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

Count are excluded!



Normalized QDC for ToF-L



Normalized QDC for ToF-R



Pixel’s hits for pp158



Pixel’s status



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



QDC for good pixel



QDC for OverCount pixel



QDC for UnderCount pixel



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?



Thank you!

General Idea

Documents

Transcript of General Idea