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TOF issues

July 13, 2017

Issues

  • Calibrations & efficiencies:
    • #1912
    • Action: SW to upload new calibrations after verifying. Estimate ~end of this week
    • What is the TOF2 efficiency now with improved calibration?
    • What is the status of the deltaT offset with the new calibrations?
    • Action: SW to look at expanding the data structure to include an e.g. tof0/1/2_all_spacepoints structure
  • MC-vs-data
    • SW noted MC truth and reco agree now, there remains a small (??? ps) discrepancy in TOF1-2
    • Action: SW to add plots showing MC true vs reco
    • Action: SW to verify that the TOF0-1-2 distances in the calibration cards are consistent with survey geometry
    • Action: SW to compare MC and data for 140, 240 MeV to benchmark level of discrepancy between MC and data
    • Action: Try to add path length information to MC. the PathLength data member is currently unfilled in MAUS.
  • TOF-tracker discrepancy
    • Reported discrepancy of ~100ps (?) between TOF and tracker? [ any plots to show this? CR? ]
      • CR noted it's not clear whether this is from tof or tracker, there is a ~3 MeV discrepancy in just trackers
      • Issue parked for now. Will revisit after vetting TOF MC
  • System performance paper

Dial-in:


Notes from meeting of June 13, 2017

  • Attendance: Rogers, Wilbur, Rajaram
  • Efficiency
    • SW has new experimental calibrations which improve the coverage
    • 6% failed calibration (now) vs 15% (before)
    • SW is checking the calibrations before uploading
    • DR: Suggestions to improve coverage:
      • combine data from May and March runs
      • do timewalk calibration from a large sample (run conditions don't matter) and use this instead of doing tw calib each time
    • CR asks about the 500ps cut in spacepoint reconstruction -- notes it cuts out ~1% of events. Can it be expanded?
    • CR: can we have a new spacepoint structure to include the events which failed the cut?
    • Action: SW to look at expanding the data structure to include an e.g. tof0/1/2_all_spacepoints structure
    • Action: SW to upload new calibrations after verifying. Estimate ~end of this week
  • TOF tracker discrepancy
    • CR: Not clear if this is from tof or tracker, there is a ~3 MeV discrepancy in just trackers
    • Issue parked for now. Will revisit after vetting TOF MC
  • MC
    • SW: MC truth and reco agree now, there remains a small (??? ps) discrepancy in TOF1-2
    • Action: SW to add plots showing MC true vs reco
    • Action: SW to verify that the TOF0-1-2 distances in the calibration cards are consistent with survey geometry
    • Action: SW to compare MC and data for 140, 240 MeV to benchmark level of discrepancy between MC and data
    • Action: Try to add path length information to MC. the PathLength data member is currently unfilled in MAUS.
      • SW notes GEANT4 calculates the path length each time, which is potentially computationally intensive.
      • DR: Can we turn this on and do some test MC to see what the MC path length is and how it compares with the straightline distance?
  • Calibration systematics
    • TOF2 dt offset: SW notes that he still sees this with his new calibrations. It is not from fits to the 'wrong peak'. To be understood
  • Date of next meeting:

Updated by Rajaram, Durga over 3 years ago ยท 4 revisions