Check-list For taking Counting runs and Going back to Production

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  • Before taking Counting Runs:
    • Ask for low current (0.3uA for Ca-48 target for detector alignment check and <2uA for C-Hole raster check)
    • Turn ON S0 and S3 (L0.0, L0.1, L0.2, L0.3, L0.4 in both arm's HV GUI). Follow HVgui in wiki howto if you need to
    • For Raster check on C-Hole, you can start runs once the position and HV read-back are settled
    • For Detector alignment Check,
      • make sure the T1 rate is ~200k
      • turn ON VDC (L6.0, L6.3 in LHRS and L4.5, L4.7 in RHRS) if the T1 rate is good
      • set Downstream MAIN detectors HV to -1900V (L1.1 in both arms), and turn them ON
      • once the position and HV read-back are settled, take runs
  • Once you are done with counting Runs:
    • Turn OFF S0, S3, Downstream MAIN detectors, and VDCs and set Downstream MAIN detectors HV to 0.0V
    • Ask for high current (production) only after turning OFF the detectors mentioned in the previous step