October 29, 2023

RC Daily Meetings are at 11:00 (am) via Zoom and in person in the counting-house meeting room (2nd floor)

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Useful Links

• Shift Signup (Read only)
  • Shift Signup

• Hall-C Controls
• Hall-C Logbook
• MCC White Board

Past 24 hours

Since the last update, we have been in the production phase. However, there were a few issues and downtime:

• SHMS Helium level reading glitch.
• NPS Chiller coolant and crystal zone back temperature sensor over the limit.
• A new trigger threshold is introduced based on Alex's suggestion.

The spokespersons jointly made decisions to take action to eliminate the above issues in future runnings.

Current Status

• Production with the newly reduced two-photon threshold.

Current Run Plan

1. . We will likely postpone the Monday corrector coil beam steering test, to the next setting change, since the current setting doesn't require the corrector coil.

1. . Wednesday, November 2, 7:30 a.m.: sweep the hall open for maintenance first thing in the morning.

We will attempt the following maintenance items:

1. 1. . NPS students remove/replace damaged PMT/base.
   2. . NPS shielding installation if ready
   3. . Ellen and Heidi for Cryo component check?
   4. . Chandan (and Dave Mac) checking/maintaining HMS hodoscope. to address this issue: https://logbooks.jlab.org/entry/4210267
2. . Do the DAQ experts need to do something?

I am sure the maintenance list will grow as we get closer to Wednesday.

1. . Tuesday, November 3, 11:00 a.m.:

We will invite Vald to give an insight into the high radiation test results.

There will be a meeting tomorrow to discuss a few remaining questions and decisions:

1. . Adjust the triggers/running condition at the current setting.
2. . Final decision on Monday corrector coil steering study.
3. . Maintenance day planning.
4. . Potential report from Vlad on the radiation damage study.

• Continue production
• Half wave plane change at 11 a.m.
• Moller measurement starting 8:30 a.m., last Friday for the day shift.

Special Studies

Sweeper off test results:

• Peter found HMS Central Momentum mismatch/Correction: https://logbooks.jlab.org/entry/4210756

Planned Accelerator Configuration Changes

• Pass change in Hall A on the 31st