2019 ECAL/HODO Meetings

General Info

• Tuesdays at 11:00 (JLab time)
• Room B101 at JLab
• Bluejeans
  • Meeting ID: 729938404
  • https://bluejeans.com/729938404
    
  • Telephone
    • 888-240-2560
    • Global Numbers
• Confluence
  • How To Post Your Talk
  • Link to this page

Documents

• Surveys
  • 2019
  • 2014/2015
  • 2019/2015 analysis
  • 2014/2015 analysis
• ECAL
  
  • Holly's 2015 timing calibration note
  • Holly's 2015 energy calibration note
  • Sebouh's time-dependent energy calibration note
  • Holly's MC position-correction note
    
    

Software

• ECAL
  • Holly's FEE calibration
  • Cosmic calibration
  • LED calibration

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
  • Edge corrections
    
    • based on tracks' y-intercept at ECAL relative to ECAL y-edge
• 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 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
  • survey-based
  • track-based

• 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