RC meeting and Run Plan, Thursday December 8th

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RC Meeting Information

• Current RC: Eric King

Time: Daily at 3:30pm

• Location: Counting house conference room

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Shift Schedule

• https://misportal.jlab.org/mis/physics/shiftSchedule/?experimentRunId=SBS-GEn-2022
• Next empty shift is a Target Operator shift on Sunday 12/11.
• Besides that there are six (6) remaining shifts to be filled until winter shutdown; I'm sure Andrew would like them filled asap so he doesn't have to chase down any shift workers.

Accelerator Status

• Everything appears to be running smoothly at the moment.
• Hall C is down for about a week due to a vacuum break.

Current Status

• The experiment was back up and running yesterday evening by 8PM. :)
  • Beam restoration went smoothly with a beam width of ~330 x ~320. [4098298]
  • Bill's carbon hole analysis looks fine. [4098365] [4098360]
• Poor GEM track efficiency, alignment needed for analysis. Last spoke with Zeke at around 1:30AM'ish and he will continue working on alignment this morning after collaborating with other GEM experts. [4098462] [4098439] [4098413] [4090862]
• Accelerator has agreed to support a Møller measurement during Friday DAY.
  • Accelerator last time didn't get started until about 9:30'ish. Target Operator still required. Shift leader should still come in as of now.

Issues remaining

• BB GEM APV unreachable and cannot be repaired at this time.
• Beam step size jump is still unresolved (I'm not clear if this has been resolved; I sent Jay an email asking for clarification for myself; Mark suggested that it would be nice if someone made, or has made, an ELOG record of this)

Short Term Run Plan

• Continue production run on He3 target, 36 uA
• Use GEnII-noSBSGEMs DAQ config
• Use ps3=0, ps5=6, others =-1
• BBCal threshold at -366 mV, HCal threshold at -19 mV
• NMR measurement every 3 - 4 hours, close to 4 hours is better

Planned Accesses to the Hall

• I presume that repairs for the BB GEM APV will wait until shutdown.

Special Requests

• None of which I'm aware, please email me ericking (@jlab.org or @temple.edu) if there's something to be added.

Notices in Effect for Shift Crew

• Power down SBS, BB, and Detector HV before making an access to the Hall

Data Collection Status

• 74 out of 141 days (~52.5%)
• Total uncorrected accumulated charge on He3: 47.020 C out of 232C (20.26%)
  • 2-Pass: 13.467 C
  • 3-Pass: 33.553 C (at end of OWL)