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
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- 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