Differences

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--- itk:testbeam [2016/09/30 13:31] – [September 30, 2016] asc
+++ itk:testbeam [2016/10/04 15:11] (current) – asc
@@ Line 1: / Line 1: @@
-======  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]].
-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]].
 To start the run, use:
@@ Line 19: / Line 21: @@
 Details on 2 tests:
-) 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.
+) 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.
@@ Line 27: / Line 29: @@
   * 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 ======
@@ Line 127: / Line 146: @@
 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.
+===== Plots without calibration=====
 Here are the plots without any calibration from Sep 30:
 {{: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|}}
@@ Line 140: / Line 163: @@
 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:
@@ Line 150: / Line 174: @@
 <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>
@@ Line 171: / Line 195: @@
-Both modules from RTI has shown signs of degradation performance. After about the nigh (~6-8h), we start to see problems for the anlog part - less efficient number of pixels, and the noise significantly increases.
+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 ======