Difference between revisions of "Run Planning Meeting Notes, Oct 11-Oct 17, 2018"

Revision as of 08:39, 12 October 2018

Friday, Oct 12 at 08:45

1. 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
2. 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.
3. Action Items
4. 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?
5. Reports
   • CDC pressure during Michael
   • Monitoring Report
   • Plot Browser
   • Statistics Spreadsheet
6. Run Plan
   • TAC run next Thursday
     • Beam Studies Monday
     • RF Recovery Tuesday

Thursday, Oct 11 at 08:45

1. Notes from the past 24 hours:
   • Beam issues most of swing (7hrs to complete amorphous run) and owl shift (~1hr of beam in total).
2. 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.
3. Action Items
4. 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
5. Reports
   • Monitoring Report
   • Plot Browser
   • Statistics Spreadsheet
6. 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
7. AOB