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basic checks of MM in ATLAS

29/5/2012 MM meeting. p1. basic checks of MM in ATLAS. Yousuke Kataoka (University of Tokyo) Thanks to Marcin for inputs and infos. Time dependence of hit count. p2. Fill 2621. Data run20231 May 12 8:26~23:53 (15h27m) at Fill2621 Nevents = 3475467 events

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basic checks of MM in ATLAS

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  1. 29/5/2012 MM meeting p1 basic checks of MM in ATLAS Yousuke Kataoka (University of Tokyo) Thanks to Marcin for inputs and infos

  2. Time dependence of hit count p2 Fill 2621 • Data run20231 May 12 8:26~23:53 (15h27m) at Fill2621 Nevents = 3475467 events Rate~62Hz random trigger (periodical) • Chamber MBT0_3 and MBT0_4 …”X” strip(resistive,190ch) and “V” strip(66ch) 30 degree decreasing as luminosity drop at beam dump MBT0_3 (hit count) MBT0_4 (hit count)

  3. p3 • definition of maxq and maxt in this slide Charge (Q) Signal shape maxq time maxt time bin … 25ns / bin x 21bins

  4. Hit map (count/channel) p4 MBT0_3 (X) MBT0_3 (V) always MBT0_4 (X) MBT0_4 (V) • 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  Veto 4 channels

  5. maxq distribution p5 33ch Pick up some channels 13ch 35ch 38ch high rate 5ch Blue~typical problem?  After beam dump All channels pedestal contribution of noise is small (should x10)

  6. maxt distribution p6 200ns(3bit) period wave (~pedestal, baseline?) 33ch 13ch 35ch 38ch 5ch After beam dump All channels All channels

  7. Hit multiplicity p7 largest maxq in all channels Linear plot • not so dependent on maxq • typically < 10 (noise is single) • some tail of high multiplicity

  8. Channel correlation p8 Ch1=40 => ch2=56 Ch1=50 => ch2=66 Ch1=70 => ch2=86 ch1 … largest maxq channel

  9. Cross talk p9 ch1=50 ch2=66 maxq2 ~ constant fraction of maxq1 Gaussian fit mean of gaussian MBT0_3 … 0.15~0.3 MBT0_4 … negligible

  10. Cross talk correction p10  subtract shape with the fraction Q_corr(t) = Q_org(t) – fraction x Q_source(t) (t=0~20) After correction

  11. Time difference of hits p11 V strip X strip difference of channel from largest maxq channel • V structure • charge diffusing along resistive strip • ~ 50ns / ch • Timing is correlated

  12. Correlation between X,V strips p12 Channel correlation timing correlation V strip X strip maxq correlation largest maxq channel in both side • 30 degree overlap make correlation

  13. Correlation between chambers p13 Channel correlation timing correlation maxq correlation MBT0_3(X) and MBT0_4(x)

  14. p14 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.

  15. backup

  16. Time difference of hits (trigger) R13 (hit count) R16 (hit count) R18 (hit count)

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