RC Meeting, Friday, September 23, 2021

RC Meeting Information

RC Daily Meetings are at 10 am, remote

• Bluejeans remote connection information:

 To join the Meeting:
 https://bluejeans.com/861439920
 To join via Room System:
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 Meeting ID : 861439920
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Useful Links

• Fall 2021 Shift Schedule
• Hall-C Controls
• Hall-C Logbook
• MCC White Board

Wednesday Status

1. Good beam throughout swing and overnight.

1. Two short interruptions:
   • Hall C (~8am) SHMS Q3 interlock (thermal breaker/fuse)
   • Hall D (~3am) ion chamber board:

1. LN2 at HMS Q1 is low (generating warning): https://logbooks.jlab.org/entry/3911064
   • No action taken, until Hati came at 7:30am (refill started). Paying attention to the ice ball formation

Current Run Plan

• Finish the current D(e,e'pi-)pp setting (likely around midnight)
• Start the elastic calibration run (~ 5 hrs of data)
  • This is a a lot of changes, please carefully document all changes and check the replays.
  • There is a rotation to 7.06 degrees
• Next Luminosity Scans
  • Again requires going to a small angle for the SHMS (7.5 degrees) and the HMS (12.5 degrees)
  • The two sets of scans require ~ 17 hrs of data

Current Issues

• Once beam was back today, a x10 amp was added to the Noble Gas Cherenkov signals and PMT gains re-matched. A quick check of the eff. showed a large improvement: new https://logbooks.jlab.org/entry/3906282 vs old https://logbooks.jlab.org/entry/3905847.

Special Requests

• MCC has been notified that we will require a beam energy measurement at this pass. Hopefully good beam this weekend and then we can ask for this to be done on Monday day.