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itk:testbeam [2016/09/30 13:16]
asc [September 30, 2016] 		itk:testbeam [2016/10/04 15:11] (current)
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-======  Pixel module test beam ====== +======  Pixel module test beam at SLAC ====== 
-(prepared by S.Chekanov)+(some notes by S.Chekanov)
  
  
 Here are the useful links on test beam in Sep. 2016 at SLAC. The plan is discuses  [[https://twiki.cern.ch/twiki/bin/viewauth/Atlas/ITkPixelTestBeamSLACSep2016|on this wiki at SLAC]]. Here are the useful links on test beam in Sep. 2016 at SLAC. The plan is discuses  [[https://twiki.cern.ch/twiki/bin/viewauth/Atlas/ITkPixelTestBeamSLACSep2016|on this wiki at SLAC]].
  
-What is used: 11 GeV secondary electrons (~100 - 200 per bunch), 5 HZ frequency. Original electron beam is 14 GeV.+What is used: 11 GeV secondary electrons (~10-100  per bunch), 5 HZ frequency. 
 +The beam sport is about 1x1 cm (tunable). 
 + Original electron beam is 14 GeV.
 The setup is described in [[https://confluence.slac.stanford.edu/display/Atlas/TestBeam| Setup at SLAC]]. The setup is described in [[https://confluence.slac.stanford.edu/display/Atlas/TestBeam| Setup at SLAC]].
 To start the run, use: To start the run, use:
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 Details on 2 tests: Details on 2 tests:
  
-1) Testing RTI (USA vendor) to test bum bonding.  We use  2 V for low voltage and max 0.5 A. We set -80 V as bias voltage for RTI (FE-I4B) board.+1) Testing RTI (USA vendor) to test bump bonding.  We use  2 V for low voltage and max 0.5 A. We set -80 V as bias voltage for RTI (FE-I4B) board.
  
  
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   * Readout ASIC with 65 nm (vs 130 nm for FE-4IB). This decrease of ASIC leads to smaller sizes.   * Readout ASIC with 65 nm (vs 130 nm for FE-4IB). This decrease of ASIC leads to smaller sizes.
  
 +Here is the setup at the end-station A:
  
-====== How to make calibration ======+This is the  RTI module (uncovered): 
 + 
 +{{:itk:img_20160928_103349.jpg?400|Setup}} 
 + 
 +This is the  RTI module + RD53 prototype (uncovered): 
 + 
 +{{:itk:img_20160928_100735.jpg?400|Setup}} 
 + 
 +Telescope: 
 + 
 +{{:itk:img_20160927_142154.jpg?400|Telescope}} 
 + 
 +Control room upstairs: 
 + 
 +{{:itk:img_20160930_071901.jpg?400|Control room}} 
 + 
 +====== How to calibrate the module ======
  
  
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 The plots you see above were done with the calibration done on Sep 29, 2016.  The plots you see above were done with the calibration done on Sep 29, 2016. 
 The calibration taken on Sep. 30 (5AM) shows some changes.  The calibration taken on Sep. 30 (5AM) shows some changes. 
 +
 +===== Plots without calibration=====
  
 Here are the plots without any calibration from Sep 30: Here are the plots without any calibration from Sep 30:
  
 {{:itk:analog_sep30.png?400|}} {{:itk:analog_sep30.png?400|}}
 +
 +Note large number of low occupancy channels (40 counts instead 50). Right after installing this module, we had 99% of fully efficient channels..
  
 {{:itk:thres_sep30.png?400|}} {{:itk:thres_sep30.png?400|}}
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 It is clear that analog channels become inefficient during the time since Sep 29 when this module was installed. It is clear that analog channels become inefficient during the time since Sep 29 when this module was installed.
  
 +===== Plots after calibration=====
 After taking the full calibration with these files: After taking the full calibration with these files:
  
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 <code bash> <code bash>
-/home/tbsclac/pixelrce/rce/moduleconfigs/RTISC2B/config/RTISC2B__cern__158.cfg # from 6.15 AM+/home/tbsclac/pixelrce/rce/moduleconfigs/RTISC2B/config/RTISC2B__cern__225.cfg # from 7.00 AM
 </code> </code>
  
  
 The calibrated histograms look as this: The calibrated histograms look as this:
 +
 +{{:itk:analog_sep30_calib.png?400|}}
 +
 +{{:itk:sigma1_sep30_calib.png?400|}}
 +
 +{{:itk:sigma_sep30_calib.png?400|}}
 +
 +{{:itk:thres_sep30_calib.png?400|}}
 +
 +{{:itk:bad_sep30_calib.png?400|}}
 +
 +
 +
 +===== Conclusions: =====
 +
 +
 +Both modules from RTI have  shown signs of degradation in performance. After about ~6-8h, we start to see problems for the analog readout. The occupancy for analog channel efficiency for  uncalibrated module goes from 99% to 70% after 6h. The noise increases by a factor 2.  
 +
 +This problem is not related to the active beam, since the red module was not under the beam on Sep 28. 
 +
 +
  
 ====== Information on scans ====== ====== Information on scans ======
itk/testbeam.1475241363.txt.gz · Last modified: 2016/09/30 13:16 by asc

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