RC meeting and Run Plan, Wednesday Sept. 20, 2023

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Return to the RC Meeting Calendar

RC Meeting Information

Time:at 3:30pm today

  • Location: Counting house conference room
  • ZoomGov Meeting Connection Information


Useful Links


Hall A call-in instructions:

  • Call RC first.
  • Techs on site 7-4:30 Mon-Th, 7-11AM Fr. RC will call Hall A work coordinator (Zak) during normal working hours. After hours, RC calls Tech on-call.
  • After 9pm everything non-emergency needs to be deferred. What is emergency and what's not? Call RC. RC talks with Mark to decide.

Hall Access procedure:

  • Access check list (binder on the counting room desk) needs to be filled out before making an access.
  • Scan (take pictures with phone) and post it to the logbook.
  • Any work inside the SBS, BB boundary need to have PS locked out -- requires two QEWs to throw the big switch. Exception: field measurements.

New instruction for shift crew when changing target:

  • Beam restoration instructions have been updated. Printed version is in the counting room.
  • When we chnage target, make sure the SOFs of Target BPMs are set to the correct values.
  • SOFs for different targets: https://logbooks.jlab.org/entry/4179164 (Note: SOFs for "No Target" has been updated and they are same as the He3 target values)

Readiness for Beam

Acclerator status

  • Maintenance day, started around 8am as no halls taking beam.
  • MCC is wrapping up the RF work. Expect to be done by 5pm.
  • Charge collected (polarization corrected):
    • Swing: 0.273C
    • Owl: 0C (SBS magnet down)
    • Day: 0C (Access)
    • Total accumulated charge for pass4: 61.35

Subsystems Checklist

For each subsystem we ask that the responsible person go over the following points:

  1. The overall status of your subsystem
  2. Will your subsystem be ready well before Hall lock-up on Friday or at the latest by Monday morning?
  3. Does your system being ready depend on your team only or are outside resources required?


  • SBS magnet and Bigbite magnets
    • work as expected
  • Corrector magnets:
    • work as expected
  • Target status (magnets, measurements, laser, installation, alignment, polarization, power etc)
  • HCal (Jiwan Poudel)
    • VME DAC GUI does not read the correct threshold -- pending issue to be fixed
  • Bigbite (Arun Tadepalli)
  • Counting House Alarms (Bill Henry)
  • DAQ (Alex Camsonne)
  • GEMs (Holly Szumila-Vance)
  • Moller polarimeter (Don Jones)
    • Hall C is going to do the Moller measurement tomorrow.
  • Hodoscopes (Rachel Montgomery):
    • Hodo status ok. Will fix two bottom bars with low efficiency.

Task list during the access today

Shift schedule

  • Looks very good, fully staffed for the next week.


Run plan

  • Target status?
  • Carbon-hole target center check: MCC will update the new SOFs in their script (Bryan)
  • Reference cell data taking (already filled with H2 at 10atm)
  • Potentially doing the Moller after all (Don can start after 8pm). PD is informed about the possibility and will support.

List of items in case target isn’t ready:

  1. Take data on reference cell at 10 atm H2 (portions that add up to 1 day)
  2. BigBite Sieve slit => only during day (Techs needed)
    1. with 8 carbon foils and take optics for 1 hr at 40 uA (Sean/Andrew - confirm time)
    2. 1 hour for single foil (magnets off) => Chance BBcal HV setting to appropriate values
  3. Moller measurement
  4. BigBite/single foil location reconstruction (~20 mins?) - BigBite + HCAL detector experts on call consulting analysis experts like Andrew/Sean (magnet on)