Wednesday, Apr. 20: DAY Shift

Return to List of Daily Run Plans

Shift Duties

• Take Production data
• If Beam has been down for longer than 3 hours:
  • Perform Reestablish Beam Procedure

NOTE that new kinematic point !

WILL BE EDITED with FINAL DECISION !!!

• • • Remember, we will have a controlled access and 10 limited keys !!!

1/ Call controlled access 7:00AM and radiation survey I spoke to Chris Curties in this morning for Calo. position survey. I am not sure if he needs a restricted or controlled. He will back to me with detail schedule later. Jessie will join today's 4PM meeting for plan.

///// Survey ///// GMp needs a detector position survey after the end run. DVCS Calo is required the position survey before de-stack.

• • once survey is done, configuration change will be followed.

2/ Detector GMp will change the LHRS angle (RHRS too ?) - Desired position/decision will be given later. DVCS Calo. will be removed. / secure safe place in the Hall till end run. (Temp.Location: near DVCS HV crate/ After end run, move into left side of RHRS)

3/ Beam 4Pass beam for GMp experiment (one pass setup till end run) MCC will definitely try high current up to 60uA. The BCM and mini-target boiling tests will be carried out.

Reestablish Beam Procedure

This procedure is to be run every time we recover from an extended beam down (>3 hours).

• Harp Scans
  • Move target to HOME position (if not already there) (mask target motion!)
  • Turn VDC HV OFF for both arms.
  • Turn DVCS Calo HV OFF
  • Ask MCC for Raster OFF (check that it turns off in the scope)
  • Ask MCC to perform Harp Scans (on IHA1H04A and IHA1H04B)
    • Must have three peaks on each with a resolution of ~200-500 μm
    • Have seen a "shoulder" on the last peak before. May be acceptable if other 2 peaks are fine.
  • Ask MCC to make an ELOG with the results of the Harp Scans
• Beam Centering on Carbon Hole Target
  • Move target to the Carbon Hole position (mask target motion!)
  • Ensure Left-HRS momentum is ~1 GeV/c
  • Set Left-HRS DAQ configuration to LeftHRSnew
    • Set prescales as ps_i = 1 for i = 1-6, and ps=0 for all others
  • Turn VDC HC OFF for both arms.
  • Turn DVCS Calo HV OFF
  • Ask MCC for Raster ON at 2x2 or whatever is on the whiteboard
    • Check that it turns on in the scope, and check Raster GUI to confirm 2x2 setting
  • Ask MCC for 5 μA beam
    • Run spot_L as explained in the detailed instructions
    • If not centered ask MCC to move beam accordingly (check board for coordinates)
    • Repeat test with different beam position until target is centered.
• Raster Target
  • Start the same settings as carbon hole centering
  • Move to Raster Target (mask target motion!)
  • Ask MCC for 5uA beam with Raster ON (2x2)
  • Check rates and confirm they are consistent with rates seen during HOME position
    • If the rates are low and consistent, then move on to next step
    • If the rates are high, it may indicate the beam has an angle that causes the beam to scrape on an edge of the target
      • Notify the RC
      • Ask MCC to readjust BPM positions until this angle is removed
      • When done, perform another Carbon Hole run just to be sure.