Preparations for Producion Data Processing Calibration Status

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Preparations for ProducionData Processing -
Calibration Status

• J Musser
• July, 2002

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Summary

• Components in Place
• Calibration Stability
• Calibration Constant Makers
• Calibration Chain Components Not Now in Place

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Calibration Components

• Offline Framework ?
• Timing Calibration ?
• T0
• Timewalk
• Charge Calibration
• Drift Point
• Non-Linearity
• Inter-Strip Calibration/Response Flattening ?
• Inter-Detector (Stopping muons)
• CalDet Energy Calibration

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T0 Stability
1 week of data adequate for T0
calibration Calibrations stable at better than 1
ns level over months Timewalk stable over much
longer time scale.
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Inter-Strip Cal Stability
Calibration stable at 1 level over months. Some
evidence for short term variations _at_ 2 level.
(Drift Point) Appropriate recalibration
periodicity is monthly
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Calibration Makers

• Timing, Pulse Height calibrations currently
  carried using ROOT scripts running from
  CandTrackSR ntuples.
• Output is a text file, which is loaded into the
  dB as a separate step.
• Check plots generated (cal constant deltas, etc)
• Running these by hand monthly would take of
  order 1 man-day per month.
• In short term, running in this mode is probably
  OK, but need to move to a more automated
  system, with mechanism in place for validating
  quality.

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Missing Components

• 1 Drift Point Cal/Non-linearity
• Drift Point working at CalDet, transfer of
  software operations to far detector should be
  trivial.
• Hardware not yet in place.
• Linearity calibration not currently understood at
  the level necessary to impliment.

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Missing Components

• Inter-Detector Calibration
• Stopping Muons. Doing this at percent level
  requires months of data.
• Many subtle issues - lots of work to do to do
  this right!
• Energy calibration from CalDet analyses should be
  available, but again there are many issues
  (reconstruction efficiencies, etc) that must be
  looked at carefully.