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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

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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

slide2
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)

slide3
p3
  • definition of maxq and maxt in this slide

Charge (Q)

Signal shape

maxq

time

maxt

time bin … 25ns / bin x 21bins

slide4
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

slide5
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)

slide6
maxt distribution

p6

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

33ch

13ch

35ch

38ch

5ch

After beam dump

All channels

All channels

slide7
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
slide8
Channel correlation

p8

Ch1=40 => ch2=56

Ch1=50 => ch2=66

Ch1=70 => ch2=86

ch1 … largest maxq channel

slide9
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

slide10
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

slide11
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
slide12
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
slide13
Correlation between chambers

p13

Channel correlation

timing correlation

maxq correlation

MBT0_3(X) and MBT0_4(x)

summary
p14summary
  • 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.
slide16
Time difference of hits (trigger)

R13 (hit count)

R16 (hit count)

R18 (hit count)

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