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Preparations for Producion Data Processing - Calibration Status

Preparations for Producion Data Processing - Calibration Status. J Musser July, 2002. Summary. Components in Place Calibration Stability Calibration Constant Makers Calibration Chain Components Not Now in Place. Calibration Components. Offline Framework  Timing Calibration  T0

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Preparations for Producion Data Processing - Calibration Status

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  1. Preparations for ProducionData Processing - Calibration Status J Musser July, 2002

  2. Summary • Components in Place • Calibration Stability • Calibration Constant Makers • Calibration Chain Components Not Now in Place

  3. 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

  4. 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.

  5. Inter-Strip Cal Stability Calibration stable at 1% level over months. Some evidence for short term variations @ ~ 2% level. (Drift Point) Appropriate recalibration periodicity is monthly

  6. 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.

  7. 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.

  8. 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.

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