RC Meeting, Tuesday, November 9, 2021

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RC Meeting Information

RC Daily Meetings are at 10 am, remote connection link: https://bluejeans.com/861439920 There is a 10:00 RC meeting today, 11/03/2021!

Accelerator Status

  1. Running beam to C and D (not sharing slit until after pass change)

Hall C Status

  1. Ready for elastic singles
  2. Last night downtime caused by:
    1. Al dummy operational limit exceeded https://logbooks.jlab.org/entry/3938967
    2. Loss of connection to cdaq, but Brad was able to resolve: https://logbooks.jlab.org/entry/3939223
    3. Loss of communication with SHMS dipole, Ellen made access early this morning

Current Run Plan

3-pass physics run plan:

  1. production
  2. elastic singles
  3. (polarity change)
  4. Heep coin 2 setting (run 13062) dummy run
  5. delta scan: begin with SHMS part first

Current Issues

  1. Replace flow switches for (HMS?) magnet power supplies: next opportunistic access (Joe Beaufait) ( PENDING )
  2. HMS Q3 insulating vacuum spikes generating annoyance alarms that take minutes to recover. https://logbooks.jlab.org/entry/3930175 Noise levels on transducers look OK, but Junaid's plot indicates Q3 is burping: https://logbooks.jlab.org/entry/3932992 .
  3. Serious HB LHe low liquid level alarms. https://logbooks.jlab.org/entry/3933051 Always seems to start with a subtle, simultaneous increase in level in Q1/2/3. https://logbooks.jlab.org/entry/3929152 .
  4. Target ladder camera was identified to be bad: Joe Beaufait will order camera ( PENDING )
  5. Still running with no UPS on the SHMS cryo controls - Heidi replaced, but need to check charge https://logbooks.jlab.org/entry/3937512
  6. HCCAM02 not functioning (lift required to replace-Brad is tracking this replacement).

Special Requests

Hall Work tomorrow:

  1. aerogel change (Vladimir)
  2. target training (Greg)
  3. change to 5-pass (accelerator)

Useful Links