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General Info

Documents

Software

 

ECAL Calibration Tasks

  • Alignment
    •  based on survey
    •  based on tracking
  • Energy
    •  Gains
      •  FEE
        • absolute
        • dedicated FEE runs and singles triggers
      •  Møllers and WABs
        • absolute
        • 4.4 GeV and positron trigger should greatly reduce their statistics/usefulness
        • singles and old-pair triggers may help
      •  Cosmics
        • relative, before and after the run
      •  LED
        • relative, before and during the run
    •  Edge corrections
      • based on tracks' y-intercept at ECAL relative to ECAL y-edge
  • Time
    •  channel offsets
    •  time-walk
    •  RF
      • signal shape is different relative to 2016
      • potentially more important for positron/singles triggers than for pairs

HODO Calibration Tasks

  • Gains
    • Calculated several time throughout the run, in the database
    • Observed dependence on luminosity, and a tiny bit on time
    • For production runs, a single run from every day (few days) can be used to calculate gains
    • For low-luminosity runs, a single run can be used to calibrate  each
    • About 15-20 file will be needed
    • Format? Either hpstr/DST with hodo information should be available, or I have a simple ntuple that gives necessary information
  • TIme
    • Currently hit time is defined as a threshold crossing time, should we use mode-7 timing algorithm?
  • Alignment
    • Hodo acceptance is covering all the ECal/SVT acceptance
    • Efficiency studies during the run didn't show any efficiency loss close to edges of the calorimeter.

Software Tasks

  •  Adding HODO to particle objects
    •  time/position-coincidence with ECAL
  •  Validating RF extraction

Meeting Agendas/Minutes

October 1, 2019