Run 18 Calibration Datasets

Below are the calibration dataset considerations for isobar needs in Run 18:

EMC
- emc-check runs once per fill (at the start)
  - For the purpose of EMC pedestals and status tables
  - 50k events
TOF
- VPD
  - Resolutions needs to be calibrated (for trigger) and confirmed to be similar for both species
TPC
- Laser runs
  - For the purpose of calibrating TPC drift velocities
  - Every few hours (as usual)
  - Either dedicated laser runs, or included in physics runs
  - ~5000 laser events
- GMT inclusion in a fraction of events
  - For the purpose of understanding fluctuations in TPC SpaceCharge
  - Trigger choice is not very important, as long as it has TPX and during most physics running
  - Something around 100-200 Hz is sufficient (too much will cause dead time issues for the trigger)
- Vernier scans
  - For the purpose of understanding backgrounds in the TPC that may be different between species
  - Once for each species under typical operating conditions
  - 4 incremental steps of collision luminosity, each step ~1 minute long and on the order of ~50k events (total = ~4 minutes)
  - TPX, BEMC, BTOF must be included
  - Minimum bias trigger with no (or wide) vertex z cut
  - link to old study
- Low luminosity fill IF a TPC shorted field cage ring occurs
  - Only one species needed (unimportant which)
  - Minimum bias trigger with no (or wide) vertex z cut
  - ~1M events
  - ZDC coincidence rates below 3 kHz
- Old ALTRO thresholds run
  - For the purpose of TPC dE/dx understanding
  - Only one species needed (unimportant which)
  - ~2M events
  - Could be at the end of a fill, or any other convenient time during typical operations
- Magnetic field flipped to A ("forward") polarity before AuAu27 data
  - For the purpose of acquiring sufficient cosmic ray data with both magnetic fields to understand alignment of new iTPC sector

-Gene