basic checks of MM in ATLAS
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basic checks of MM in ATLAS
Yousuke Kataoka(University of Tokyo)
Thanks to Marcin for inputs and infos
p129/5/2012 MM meeting
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Fill 2621
MBT0_3 (hit count) MBT0_4 (hit count)
decreasing as luminositydrop at beam dump
Time dependence of hit count p2
• Datarun20231 May 12 8:26~23:53 (15h27m) at Fill2621Nevents = 3475467 events Rate~62Hz random trigger (periodical)
• Chamber MBT0_3 and MBT0_4 …”X” strip(resistive,190ch) and “V” strip(66ch) 30 degree
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Charge (Q)
time
time bin … 25ns / bin x 21bins
maxq
maxt
Signal shape
• definition of maxq and maxt in this slide
p3
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Hit map (count/channel)
• always hit on 4 channels (MBT0_3(X) ch=96, MBT0_3(V) ch=33, MBT0_4(X) ch=96, MBT0_4(V) ch=33)• dip and bump at low, relatively stable at high maxq
always
MBT0_3 (X) MBT0_3 (V)
MBT0_4 (X) MBT0_4 (V)
Veto 4 channels
p4
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maxq distribution
After beam dumppedestal
problem?
13ch
33ch
35ch38ch
All channels
5ch
Pick up some channels
contribution of noiseis small (should x10)
Blue~typical
high rate
p5
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maxt distribution
After beam dump
13ch
33ch
35ch38ch
All channels
5ch
All channels
200ns(3bit) period wave (~pedestal, baseline?)
p6
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Hit multiplicity
• not so dependent on maxq• typically < 10 (noise is single)• some tail of high multiplicity
largest maxq in all channels
Linear plot
p7
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Channel correlation Ch1=40 => ch2=56Ch1=50 => ch2=66Ch1=70 => ch2=86ch1 … largest maxq channel
p8
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Cross talkch1=50 ch2=66
maxq2 ~ constant fraction of maxq1
Gaussian fit
mean of gaussian
MBT0_3 … 0.15~0.3MBT0_4 … negligible
p9
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subtract shape with the fraction
Cross talk correctionQ_corr(t) = Q_org(t) – fraction x Q_source(t) (t=0~20)
p10
After correction
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Time difference of hitsX strip V strip
• Timing is correlated• V structure charge diffusing along resistive strip ~ 50ns / ch
difference of channel from largest maxq channel
p11
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Correlation between X,V stripsChannel correlation timing correlation
largest maxq channel in both side
• 30 degree overlap make correlation
maxq correlation
p12
X strip
V strip
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Correlation between chambersChannel correlation timing correlation
maxq correlation
MBT0_3(X) and MBT0_4(x)
p13
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summary
• I briefly looked at MM data in ATLAS - hit rate, hit map, signal properties, channel correlation - cross talk (need to clean up)• work in progress, I should look into details.
p14
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backup
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R16 (hit count) R18 (hit count)
R13 (hit count)Time difference of hits (trigger)
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