MEs and Quality Tests

• 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
    • 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

DQM/SiPixelMonitorClient/test

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