basic checks of MM in ATLAS

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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 - PowerPoint PPT Presentation

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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

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

Charge (Q)

time

time bin … 25ns / bin x 21bins

maxq

maxt

Signal shape

• definition of maxq and maxt in this slide

p3

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

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

maxt distribution

After beam dump

13ch

33ch

35ch38ch

All channels

5ch

All channels

200ns(3bit) period wave (~pedestal, baseline?)

p6

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

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

p8

Cross talkch1=50 ch2=66

maxq2 ~ constant fraction of maxq1

Gaussian fit

mean of gaussian

MBT0_3 … 0.15~0.3MBT0_4 … negligible

p9

subtract shape with the fraction

Cross talk correctionQ_corr(t) = Q_org(t) – fraction x Q_source(t) (t=0~20)

p10

After correction

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

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

Correlation between chambersChannel correlation timing correlation

maxq correlation

MBT0_3(X) and MBT0_4(x)

p13

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

backup

R16 (hit count) R18 (hit count)

R13 (hit count)Time difference of hits (trigger)