October 30, 2023

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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 with a reduced threshold (from 750 to 650). A few trigger tests were completed with the coin_sparse_low configuration, and the initial look is good for operating at a lower threshold and higher current. Feedback from MCC: Hall A at 45uA and Hall C at 35uA will cause issues. Hall A from this point on will be down for a while, we should think about profiting from running at a higher current.

In terms of data collection, it was an 80% day. 1084 mC of integrated charge collected. Crystals in the column 4 are seeing further degradation. Halfwave plated was taken out at 9:20 am today. We will continue production.

RC Summary

https://logbooks.jlab.org/entry/4212480

Current Status

• Production with the newly reduced two-photon threshold.

Near Future Plan

1. We will perform a corrector coil beam steering test for the next angle setting with a non-zero corrector coil field.
2. Wednesday, November 2, during the beam study, 7:00 beam stops, 7:30 a.m.: sweep the hall open for maintenance; Hall will enter restricted access at 8:00-8:15 a.m, and sweep close the hall at 16:00.

We will attempt the following maintenance items:

1. 1. NPS students will remove all PMTs + bases from column. Hall tech support is needed for this part.
   2. Two new bases with the low voltage regulator bypassed (verified) with be swapped into the NPS.
   3. NPS shielding installation if ready
   4. Heidi is looking into adding an additional bandit to ensure SHMS dipole stability.
   5. Chandan and Dave Mac will access and check the HMS hodoscope patch panel. to address this issue: https://logbooks.jlab.org/entry/4210267
   6. Aaron will push new code for the NPS chiller controller.
2. Wednesday, Nov 1, 11:00 a.m.: We will invite Vald to give an insight into the high radiation test results.

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

Special Studies

• 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