Run Planning Meeting Notes, Feb 28 - Mar 6, 2019

• Run_Coordination_Meetings:Spring2019_Run
• PrimEx-η run plan
• Production runs, number of triggers
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Thursday, Feb. 28 at 08:45

1. Past 24 hours:
   • Beam orbit locks off to allow Hall C current increase
   • Unstable beam, lots of tuning to get high current for Hall A/C. 25 trips/hr average and will work to improve when they identify a path forward.
   • Compton Production:
     • 2.86 billion triggers with Be (Runs 61321-61344)
     • 0.24 billion triggers with previous no target (Runs 61308-61311)
   • Occupancy plots - Sasha
   • Compton plot run 61322 - Drew
   • Energy monitoring - Alexandre
2. Today (Thursday):
   • Remove Be foil @ 8 AM, but leave cylindrical holding tube. Lockup hall at ~1 pm
   • Production running with no target until 6 am Friday morning
3. Friday plan:
   • LHe target installation:
     • Hall open at 6 am for bleeding up beamline

Friday, Mar. 1 at 08:45

1. Past 24 hours:
   • Be target removed Thursday morning
   • Examination of material in beamline
   • Shift in CompCal acceptance along +x
     • FCAL survey from 2015 shows it is shifted in +x direction by 0.53 cm, which matches the shift in CompCal acceptance
2. Compton production statistics
   • 0.24 billion triggers with no target (Runs 61308-61311)
   • 2.86 billion triggers with Be (Runs 61321-61344)
   • 0.42 billion triggers with empty target holder cylinder (Runs 61345-61354)
   • Summary: Empty target is ~25% of statistics for Be target running
3. Today's plan:
   • LHe target installation (ongoing):
     • Hall opened at 6 am for bleeding up beamline and target removal
     • Target installation ongoing and S&A to fiducialize and align target around 10 am
     • Other work in the Hall:
       • Start counter installation status: cabled and signals checked? who?
       • Others?
   • Empty (evacuated) LHe cell running overnight
4. LHe target cooldown and filling schedule?
   • Chris expects ~10-12 hours required for cooldown. He would like to be here during the initial fill.
   • Possible plan: Run warm empty target for few shifts, start cooldown over the weekend and fill on Sunday/Monday?
5. Plans for next week:
   • Beam studies on Monday:
     • Parity studies in Hall A from 8:30-12
     • Todd will work on improving Hall D optics and convergence from 12-4
   • RF recovery on Tuesday: expected but don't know duration yet