RC meeting and Run Plan, Thursday Oct. 12, 2023

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RC Meeting Information

Time: Monday - Friday at 3:30pm

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


Useful Links


Hall A call-in instructions:

  • Call RC first.
  • Techs on site 7am-4:30pm Mon-Thu, 7-11am Fri. RC will call Hall A work coordinator (Zach) 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 change target, make sure the SOFs of Target BPMs are set to the correct values.
  • SOFs for different targets: Needs an update after restoring beam tonight (Note: SOFs for major target positions are on the Control Room whiteboard.)

Status Update

Overall Summary

Day Shift Plan EPR: calibaration while waiting for beam: https://logbooks.jlab.org/entry/4197658 https://logbooks.jlab.org/entry/4197666 https://logbooks.jlab.org/entry/4197679

Swing Shift Plan Beam Checkout: (a) Follow steps 1 through 9 of https://sbs.jlab.org/wiki/index.php/HOW_TOs#If_beam_has_been_down_due_to... (b) Check carbon hole position; (c) Ask MCC for a beam position that will center beam on X; (d) Repeat step 9 of link above; (e) If beam is centered in X, then go to (f); otherwise, retry (c), (d) until beam is centered in X; Note the beam XPOS that centers the beam on whiteboard; (f) Ask MCC for a beam position that will center beam on Y; (g) Repeat step 9 of link above; (h) If beam is centered in X, then go to (i); otherwise, retry (f), (g) until beam is centered in Y; Note the beam YPOS that centers the beam on whiteboard; (i) Beam should now be centered on the carbon hole; Ask MCC to update XSOF, YSOF, with the values you have obtained correcting previous XSOF, YSOF with XPOS, YPOS; (j) Repeat step 9 of link above, and make sure beam is still centered; (k) Done with beam checkout, go back to production!

After beam checkout, switch to PolHe3:

  • Bill wants to be here for the first beam on PolHe3!!! He wants to check ion chambers on PolHe3, so please call him before!
  • start with 5uA, then increase by 5uA every 5min up to 45uA

Beam After Maintainance

Opportunistically between spin ups (?):

  • Single foil optics data
  • Moller measurement

Accelerator status

  • Recovering from south linac 2K cold box trip;
  • If you want to get into the hall, please communicate with the RC to get this organized!

Data collected :


Hall A Subsystems Status


  • Ladder Alignment achieved;
  • EPR performed => calibration constant 0.81


  • All HV currently off. Hall is in controlled access.
  • BBCal 7.4 dead. Discussion on changing PMT base at next available time.


  • SBS and BB are off. Hall is in controlled access.

Hall access requests

If anyone wants to make an access, let the RC know!

Shift schedule


  • Thursday 10/12 OWL (Target Operator)
  • Friday 10/13 OWL (Target Operator)
  • Saturday 10/14 DAY (Target Operator)

Please check when your shifts are!


Please sign up for any open shifts!

Running Plan

  • Standard production running at 45uA, with NMRs every 3 hours.

==> List of items in case He3 production running isn’t ready:

  1. Take data on reference cell at 10 atm H2 (portions that add up to 1 day) [85% (4200 elastic events) more data required for Bigbite momentum calibration]
  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. BigBite/single foil location reconstruction (~20 mins?) - BigBite + HCAL detector experts on call consulting analysis experts like Andrew/Sean (magnet on)