Thursday, November 20: SWING Shift

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• General considerations
  • Vincent Sulkosky is the current Run Coordinator. Please contact me 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, 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, P_LHRS=2.71 GeV, Theta_HRS=22.83, Theta_calo=12.35
  • Note the controls for the left dipole are not stable, so do not change the momentum settings.
  • Make sure to use the DVCS CODA configuration for all runs (even when taking single arm HRS data).
  • 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 [3-4 hours]
    • 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.