November 7, 2023
From HallCWiki
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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Contents
Useful Links
Instruction for RCs
- Half-wave plate change
- Follow the instructions in the link above whenever the HWP is changed flipped.
- There was discussion of a heat and reactivation in the 08:00 meeting on 07/11/23.
- If this happens, will need another Moeller measurement.
Past 24 hours
- Moeller measurement, took a bit longer than planned. An access was required, see Dave Gaskell's summary here.
- Back to production running after the Moeller measurement.
Issues:
- Two odd blocks in calorimeter
- Log entry #1
- Log entry #2
- Log entry #3
- Log entry #4 - This is Wassim's analysis of the issue.
- We will potentially have an access this morning to try and address block 497.
- It looks like power cycling the VME crate for a different issue resolved this
- No access needed! (:
RC Summary
Current Status
- Running production on KinC_x50_4' after.
- Access to investigate block 497.
Near Future Plan
In the near term future:
- Keep running the current setting.
- Wednesday Owl, beam studies from 05:00-07:45
- We will do a cosmics run of ~2 hours with the sweeper on followed by another ~2 hour run with the sweeper off.
- On Wednesday, we will have ~8 hours or so to access the Hall during the maintenance downtime. Planned activities -
- Heidi wants to take a look at the SHMS door after the issue on Wednesday.
- Noisy block in Column 8, Row 22 - Take a look at if it still looks odd.
- Wait to see if amplifiers will survive before replacing more bases.
- Remove more bases - take another column out.
- One column takes ~1-2 hours (to remove).
- May have time to remove 2?
- Measure B field at location of bases?
- Gain vs x dependence.
- Does sweep magnet have to be off to get near the NPS?
- Any measurement has to be done with magnets on and before NPS moved to have any point.
- Asked MCC for a controlled access ASAP on Wednesday.
- Radcon has us in the queue, the NL, SL and injector are all going to controlled so will have priority.
- My suspicion is that we'll be swept around 09:00 with access possible 09:30-10:00.
Special Studies
- Cosmics with sweeper on vs off - Owl Wednesday
- Elastics on Thursday (09/11/23) or Friday (10/11/23)?
- Need to decide on the plan for this before the access.
- Affects where we leave the NPS when we lock up.
Standing Issues
- Block 497 - problematic.
- 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 on the 13th of November (13/11/23).
Special Requests
- Stable beam and mercy from the DAQ gods to continue.
