HB1 sourcing TB2006 Alexi Mestvirishvili University of Iowa - PowerPoint PPT Presentation

Title: HB1 sourcing TB2006 Alexi Mestvirishvili University of Iowa


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HB1 sourcing TB2006 Alexi MestvirishviliUnivers
ity of Iowa
2006 Fall HCAL meeting
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• Results only from HB1
• Source used 5mCi
• Comparison of two
  different scans
• August 30th, CALIB 5 (First scan)
• Sept 19th, CALIB 5 (Last scan)
• Expected Signal value 0.20-0.40 chan. above
  pedestal
• Before actual sourcing all tubes were scanned
  with dummy wire
• to determine bad tubes

Missing layers tubes were declared as bad
Phi 11 Phi 12 Phi 13 Phi 14 15 7 1 3 16 2 7
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Problems
By default one file per tube (layer)
Expected only one peak
From time to time run control was putting the
data from several layers into one file. To
distinguish layer from layer one needs to use
index number available in the data otherwise
data are ok
Data from several different layers in the same
file
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More problems
Problem 1
Small signal difference is around 0.18 should be
around 0.3 0.35 30675,Phi12,tower1,
Layer13 30677,Phi12,tower12,Layer15 30679,Phi13,to
wer1, Layer4 Probably due to fibers inside
megatile
Normal signal
Problem 2
Unexpected behavior Run 30648,Phi11,tower16,Layer
0
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Signal vs tower(ped subtracted)
Pedestal subtracted Signal vs tower (tower number
110 Means depth 1 tower 10
Phi 11
Phi 12
Depth 2
Phi 14
Phi 13
Depth 1
Phi 13 layer 16 has large signals (above 0.45
0.5)
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Results Signal and Pedestal
Ratio Last/First
All ?, all layers together
Stable pedestal Error on Mean 0.15
Signal Mean 0.99 RMS 0.017
Pedestal Mean 1.0 RMS 0.0015
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Results Uncertainty
Absolute uncertainty -- ?in - ?out individual
tiles
First scan 0.0056 chan
Result from HB SX5 sourcing for individual tiles
0.005
Last scan 0.0059 chan
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Results Uncertainty
Relative uncertainty (?in - ?out
)/lt?gt individual tiles
First scan -- 0.0174
Result from HB SX5 sourcing for individual tiles
-- 1.9
Last scan -- 0.0180
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Results Uncertainty
Relative uncertainty (??in -??out )/?? for
towers (summation over layers)
First scan -- 0.60
Result from HB SX5 sourcing for towers 0.6
Last scan -- 0.52
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Summary

• Two different scan of HB1 during TB2006 shows
  good consistency
• Absolute uncertainty for tiles were determined as
  ?in - ?out
• where ? is pedestal subtracted signal
  value
• Calibration precision for each individual tile is
  at the order 1.9
• Precision for towers is at the order 0.5 0.6
• Those numbers are in perfect agreement with the
  HB source calibration
• at SX5