Wednesday, December 3: SWING Shift

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  • General considerations
    • Tanja Horn is the current Run Coordinator. Please contact directly via RC phone 757-876-1787
    • Follow the generic Instructions for shift takers
    • Shift leaders: Please make sure to fill out the beam time accounting form and write a "Shift Summary" log entry at the end of your shift regardless if there is beam or not.
    • In general, Hall technical staff should not be contacted by the shift crew - please call the RC first.
  • Instructions for this shift
    • The target operator is required to supervise the cryo-target.
    • Kinematics, DVCS Kin1: Ebeam = 7.3 GeV, PLHRS=2.71 GeV, Theta_HRS=22.83, Theta_calo=12.35
    • Make sure to use the DVCS CODA configuration for all runs (even when taking single arm HRS data).
    • MCC will work to setup beam for Hall A
    • Turn off VDC and calorimeter high voltage before MCC tunes beam into the Hall
    • Put target in "Home" position
    • If only tune beam is available then:
      • Take a run (100K events) with raster ON with clock trigger (follow these instructions to set the triggers [1]). Check raster pattern and halog it
      • Repeat above step with HRS trigger 1 (s0&&s2) in the DVCS configuration file
  • Instructions for CW beam
    • When stable CW beam has been achieved for Hall A, execute the following steps of the "Beamline" run plan here.
      • Note that we will NOT be going through the Compton chicane.
      • Initial BPM/Raster checks/Beam centering
      • BPM Calibrations (Bullseye Scan) [1-2 hours]
      • Superharp Scan with Raster off/on
    • If time remains, start spectrometer checkout and begin looking for HRS-calorimeter coincidences. For this part of the plan - contact Carlos and Paul (contact info on the white board).
    • The calorimeter HV will need to be turned on and put in the correct position - this will be done by Carlos or his assigned substitute.
    • Preliminary BCM Calibrations up to 10-20 μA, or what MCC can deliver if lower than this.