Monday, November 10: SWING Shift

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  • General considerations
    • We do not yet have an RC phone. Dave Gaskell is the current Run Coordinator. Please contact me directly via the JLab paging utility: [1]
    • 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
    • In general, technical staff should not be contacted by the shift crew - please call the RC first.
    • If the run plan calls for some significant period of beam at 10 uA or greater please call Mahmoud Ahmad, who would like to perform a parasitic beam diagnostic test (no impact to us). His contact information will be written on the white board in the Counting House.
  • Instructions for this shift
    • The hall may be in Restricted Access at the beginning of shift. Once the target cooldown and other work in the hall is complete, we will return to Beam Permit.
    • The first task will be completion of the Dump Ion Calibration test plan (this is driven by MCC). After some time, they will ask the hall to "calibrate the raster."
      • Calibrate the raster:
  1. Start a run (use DVCS mode for the DAQ) - set up the DAQ to use a "clock" trigger. There is no need to insert a target. Make sure the beam is in CW mode (it can be low current, 1-2 uA).
  2. Use Luke's spot_Left script to look at the raster and BPMs.
  3. Find the approriate raster setting to achieve a 2 x 2 mm beam size (according to the BPMs) at IPM1CA and IPM1CB (start a new run each time you change the raster size).
  4. Tell MCC the appropriate raster setting - they will continue with their test plan.
    • After completion of the Dump Ion Chamber Test plan, execute steps 1-3 of the "Beamline" run plan here. Note that we will NOT be going through the Compton chicane.
    • Perform a rough BCM calibration up to 20 uA. This calibration will use the Unser only - not the Faraday cup. First, start a CODA run. Ask MCC to send beam in at the following currents: 0-5-0-10-0-15-0-20-0-15-10-0-5-0. Spend two minutes at each current. NOTE: this may be deferred.
    • If time remains, start spectrometer checkout and begin looking for HRS-calorimeter coincidences. For this part of the plan - contact Carlos (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.
    • 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 configuration for all runs.