Run Planning Meeting Notes, Oct 11-Oct 17, 2018
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Contents
Wednesday, Oct 16 at 08:45
- Notes from the past 24 hours:
- Slow process in getting beam back to the hall
- Didn't finish empty target run until early hours of the morning
- Postponed Lubomir's run until this morning
- Slow process in getting beam back to the hall
- CEBAF
- Todd's refocusing of our beam this morning
- Action Items
- Issues
- More DAQ issues (Owl shift summary)
- Reports
- Run Plan
- AOB
- Beni next RC
- More RCs needed
Tuesday, Oct 16 at 08:45
- Notes from the past 24 hours:
- Beam came back on swing shift. Smooth throughout the night
- CEBAF
- RF recovery/general maintenance day today
- Aggressive timeline: beam back by 1pm
- RF recovery/general maintenance day today
- Action Items
- Issues
- Reports
- Run Plan
- AOB
Monday, Oct 15 at 08:45
- Notes from the past 24 hours:
- Good weekend of running with stable beam
- CEBAF
- Spent all day and into swing on Friday to fix BLM trips. This worked, and the beam was quite stable. RF and BLM trips down
- Action Items
- Issues
- DAQ issues: rocCDC2, dropping to 0 rate during running with 450nA beam.
- Reports
- Run Plan
- Beam Studies today. We are getting parasitic beam at the moment. Who needs an access? Who wants an access? How long do you need?
- Likely RF Recovery tomorrow
- TAC run with V-wire Thursday
- Week 4 Week 5
- Very likely that on Monday 10/22 Hall C will go down for at least 5 hours, maybe longer. Schedule a TAC run with foil?
- AOB
Friday, Oct 12 at 08:45
- Notes from the past 24 hours:
- Beam back at 11:30 am, Sasha finished L1 trigger studies by 2:00 pm
- MCC suggests they recalibrate iIon chamber to reduce trip rates. Previously, it was only calibrated up to 80 nA.
- Sergey performed high rate DAQ tests with current up to 900 nA
- David has new online monitoring site up
- CEBAF
- Almost 20 BLM trips/hour through yesterday and into the early morning. Hall C went down around 4 am and BLM trips were significantly reduced. They think there is something wrong with the beam that is being injected into the accelerator.
- Will do a retune of the accelerator around 10am today. Should take 1-2 hours.
- Action Items
- Issues
- Multiple alarms for BCAL downstream environmental sensors. Elton contacts Nick who reports downstream BCAL PLC -Ethernet port quit. Access needed.
- Lots of DAQ issues. Sergey had to revert the software back to a previous version
- Beam Position Issues
- Eugene noticed beam was drifting, which coincided with drops in rates (6:00pm)
- This continued throughout swing shift and into early morning
- After an extended downtime, beam appears to be stable through the night
- Hall C went down and then we got a retune where the locks in the accelerator were reset. No more drifting. Excess rate over the template suggests that significant parts of the beam are striking the diamond frame. Improved coherent peak after retune.
- The drifts in position do not seem to be related to the beam energy.
- Diamond alignment issue?
- Reports
- Run Plan
- TAC run next Thursday
- MCC white board
- Beam Studies Monday
- RF Recovery Tuesday
- Week 4 Week 5
Thursday, Oct 11 at 08:45
- Notes from the past 24 hours:
- Beam issues most of swing (7hrs to complete amorphous run) and owl shift (~1hr of beam in total).
- CEBAF
- 5th pass separator failed during swing shift and remained problematic into the beginning of owl. Beam back at 3:20am.
- PSS drop in the machine at 3:30 am. No beam until 6am.
- Action Items
- Issues
- Tail on one side of beam in x and y. Richard gives a nice explanation of what may be happening. Beam OK for now. Should we ask for a retune before the weekend?
- MyaViewer missing events
- Lots of issues with DAQ- rocCDC2
- Reports
- Run Plan
- Need to schedule a TAC run
- Can we do this opportunistically?
- Use bleedthrough current?
- Hall C plans to switch experiments on approximately the 22nd. This is around the time of accelerator maintenance, so they may plan to switch experiments then.
- Hurricane Michael arriving this evening. Do we need to take any precautions?
- Week 4 Week 5
- Beam Studies Monday
- RF Recovery Tuesday
- Need to schedule a TAC run
- AOB