General Info
- Tuesdays at 11:00 (JLab time)
- Room B101 at JLab
- Bluejeans
- Confluence
ECAL Calibration Tasks
- Alignment
- based on survey
- based on tracking
- Energy
- Gains
- Cosmics (Andrea/Luca, ~Oct 15)
- relative, before and after the run
- FEE (Andrea/Luca)
- 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
- Sampling fractions
- energy-dependent, simulation
- Position/projection corrections
- previously simulation based, no track information
- Edge corrections
- based on tracks' track-y -intercept at ECAL relative to ECAL y-edge, simulation
- Time
- RF (Nathan, ~Oct 15)
- signal shape is different relative to 2016
- potentially more important for positron/singles triggers than for pairs
- channel offsets
- time-walk
- as long as current parameterization is should be fine if convergent or cutoff above 2.2 GeV, shouldn't need updating
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
- Generate aligned detectors (and track scoring plane(s))
- Simulation
- single-e+/e-/γ events over entire kinematics for corrections
- remove 2 dead crystals, e.g. set gains to zero in database
- Validating RF extraction
- Final ECAL gains in database
- Final HODO gains in database
- ECAL Time offsets in database
- Adding HODO to particle objects
- Time/position HODO-ECAL coincidence
- Update ECAL corrections for 2019/4.4 GeV
- sampling fraction
- edge shower loss
Meeting Agendas/Minutes
October 1, 2019
- 2019/2015 survey analysis
- Task lists, priorities, assignments
- 2019/2015 survey analysis
- cosmic gains (Andrea/Luca) and RF (Nathan) are first, ~2 weeks
- followed by FEE gains (Andrea/Luca) and timing offsets
- then higher order corrections
- discussed simulation needs for corrections, added to task lists above
Additions
- Simulations needed for
- sampling fraction (energy dependence)
- edge corrections (track truth Y, scoring plane)
- position corrections (projective, off crystal axis)
- Missing crystal on electron side, and one moreneeds to go in simulation
- 442 statuses in the database
or gain to 0
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