Latest revision as of 15:25, 31 October 2023

Back to the previous page

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

• Zoom remote connection information:

 Join ZoomGov Meeting
 https://jlab-org.zoomgov.com/j/1617015555?pwd=L09IQ216dml6ZmM5ODExVjFsMXdsUT09#success
 Meeting ID: 161 701 5555
 Passcode: 
 One tap mobile
 +16692545252,,1607100885# US (San Jose)
 +16468287666,,1607100885# US (New York)
 Dial by your location
       +1 669 254 5252 US (San Jose)
       +1 646 828 7666 US (New York)
       +1 669 216 1590 US (San Jose)
       +1 551 285 1373 US
       833 568 8864 US Toll-free
 Meeting ID: 160 710 0885
 Find your local number: https://jlab-org.zoomgov.com/u/ab2CekLXgQ

Useful Links

• Shift Signup (Read only)
  • Shift Signup

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

Instruction for RCs

• Half-wave plate change
  • Follow the instructions in the link above whenever the HWP is changed flipped.

Past 24 hours

Mostly smooth production. Good 24 hours.

Issues:

• Flipping script procedure falling through the crack caused large charge asymmetry for two hours, Hall C RC didn't follow the procedure: https://logbooks.jlab.org/entry/4212928
  • Suggestions for the future

1. Adding the charge asymmetry to the Hall C alarm handler.
2. Making the instruction clear for the future Hall C RC on the half-wave plate change. (This information must be passed on).

• Popcorn alarm: https://logbooks.jlab.org/entry/4212784
• Chiller average temperature: https://logbooks.jlab.org/entry/4212896
• DAQ issue in the morning thanks to Chandan, Raydo, and Wasim for resolving it: https://logbooks.jlab.org/files/2023/10/4212913/nps_hms_coin_2458_50k.pdf

The plan is to data taking till 7:00 am Wednesday.

RC Summary

https://logbooks.jlab.org/entry/4212964

Current Status

Near Future Plan

Wednesday, November 2, during the beam study, the plan is the following:

• 7:00 beam stops. Rotate SHMS to 38 degrees.
• 7:30 a.m.: sweep the hall open for the restricted access.
• Hall will enter restricted access at 8:00-8:15 a.m.,
• No time limit on closing the hall.

• We will attempt the following maintenance items:
  • Moving NPS to 6 meters. (from the target). Re-survey for radiation level with Radcon. 6m pin and 9m pin.
  • NPS students will remove Column 0: PMTs + bases. Hall tech support is needed for this part.
  • Two new bases with the low voltage regulator bypassed (verified) will be swapped into the NPS (column 0).
  • NPS shielding installation: large sheets of borated-polyethylene will be transferred from Hall A to C by Hall C tech. (3-4m NPS position), fixed to the rails.
  • After installing the shield, reconfirm SHMS angle limit.
  • Replace the NPS radiation monitoring dosimeters. (Mitch and others), 8 in column #0, 8 in cloumn #29.
  • LED troubleshooting. (Mitch)
  • Heidi is looking into adding an additional bandit to ensure SHMS dipole stability.
  • Chandan and Dave Mack will access and check the HMS hodoscope patch panel. to address this issue: https://logbooks.jlab.org/entry/4210267
  • Aaron will push a new code for the NPS chiller controller.
  • Joe will guide a walk-through at 1 p.m.
  • Virtual machine reboot request from the computing center (Hanjie is coordinating this part)
  • Bob will take another look at the scaler server.
  • Simona will place some test samples into the Hall (not NPS-related).
  • Paolo for additional lead shielding, we need the holder. (expected to come in today in the afternoon).

In the near term future:

1. Sometime in the future, we will invite Vald to give an insight into the high radiation test results.
2. We will perform a corrector coil beam steering test for the next angle setting with a non-zero corrector coil field.

Special Studies

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

Planned Accesses to the Hall Today

Planned Accelerator Configuration Changes

Special Requests