November 2, 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)

• Zoom remote connection information:

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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

• Work in Hall yesterday all completed
  • Well done and thanks to all involved!
• Beam back around 18:30.
• Swiftly followed by PSS issues that kept us down until the end of swing.
• By the time beam was back, NPS temperatures stable, skipped test for setting KinC_x60_4 in the run plan
• In switching back to KinC_x50_4' kinematic, ran into issues with the magnet GUI
• GUI was VERY slow and unresponsive, problems from earlier in the day then came back to haunt us
  • HMS Q3 did not seem to display at all
  • Contacted engineer on call, Ellen, who killed a process that improved things.
  • The GUI then became, charitably, usable. We struggled through and got the kinematic set up though (with the added fun of a HMS dipole interlock)
  • Luckily, no further kin changes in the near future, but we should look into this issue further.
• After that, very little drama. Beam was good overnight and data taking has been ok, with one exception.
  • VME2 and VME3 seemed to die for runs 2524 and 2525. The shift crew only noticed this when they observed that the rates were lower than expected.
  • Please check carefully for issues like this.
  • Hopefully the crew can clarify how they resolved this if they're in the meeting
• Since then, smooth sailing.

Issues:

• Magnet GUI very slow/unresponsive
• VME2/3 not running/dying for some reason
  • Please watch out for this!

RC Summary

https://logbooks.jlab.org/entry/4213959

Current Status

• Running production on KinC_x50_4'

Near Future Plan

In the near term future:

• Sometime in the future, we will invite Vlad to give an insight into the high radiation test results.
• We will perform a corrector coil beam steering test for the next angle setting with a non-zero corrector coil field.
  • Is this still going ahead?
• Keep running the current setting

Special Studies

• Moeller run on Monday? (06/11/23)
• Try to fit in the KinC_x60_4 test?
  • How high priority is this?

Standing Issues

• Implementing checks for charge asymmetry in alarm handler and online analysis: https://logbooks.jlab.org/entry/4213566

Planned Accesses to the Hall Today

• None

Planned Accelerator Configuration Changes

• Pass change is not next Tuesday, it's on the 13th of November (13/11/23). So we have ~10 days of 5 pass beam left.

Special Requests

• Peter took a look at the resolution degradation over time, a topic it might be worth discussing further.