MEs and Quality Tests

MEs stored for:
  • digi
    • Number of Digis
    • Digi charge in ADC counts
      • single module adc:
        • --> low charge tail due to charge shared between close pixel
        • --> timing tail (high value) due to charge integration
      • 2-D hit map
  • cluster
    • Total charge of clusterg
      • single module charge --> fluctuations in the energy loss of charged particle passing through a thin layer of matter
      • barrel summary_charge_in_shell shows detector structure
        Summary_charge_in_PixelBarrel.png Summary_charge_in_Shell_mI.png
      • fpix summary_charge_in_shell almost homogenous
    • Barycenter X and Y position (local coordinates)
    • Max and min values for column and row
    • Width of the cluster in X and Y
    • Total size of the cluster (in pixels)
    • 2D hitmap of cluster barycentre locations
      • hitmap can be compared to digi hitmap to identify problems with clusterization
      • sizes of clusters and charge can be monitored for unexpected values
      • Identify calibration problems
      • results in one area of the detector can be compared to others to look for non-uniformity
  • residual

Input settings for quality tests are defined in sipixel_qualitytest_config.xml configuration file in user's area

but needs to move into DB.

Output, warnings/errors alarms, is just written as text in client shell and GUI window, but needs to move into .xml file and be written to DB.

  • Defined in xml files
  • Currently implemented:
    • Digis: range & mean of adc & ndigis
    • Clusters: range & mean of charge & nclusters & size
    • Residuals: range & mean of residuals (x,y)
  • Tried Gauss and Landau fits on residuals and charge distributions, it seems too memory intenstive (get lots of alloc errors and crashes, even w/o printout from fits)
  • Infrastructure in place for tests, it needs to tune test variables (cuts) on real data from real detector; easy to implement new tests and even easier to change cuts

  • single module view -- > validity xRange
  • summary module view -- > validity yRange
  • --> meanExpectedWithin
  • specific digi QT
  • specific cluster QT
    • cluster charge --> landau [fluctuations in the energy loss of charged particle passing through a thin layer of matter]
  • specific residual QT
    • residual --> gauss

-- MiaTosi - 22 Jun 2007

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Topic revision: r1 - 2007-06-22 - MiaTosi
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