RC Meeting, Friday, October 29 , 2021

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RC Meeting Information

RC Daily Meetings are at 10 am, remote connection link: https://bluejeans.com/861439920

Accelerator Status

  1. Beam delivery to Halls B,C,D

Hall C Status

Continue production at 42 muA.

  1. day shift: productive, start BCM calibration ~14:10. D. Mack fixed the drifting ibcm1 by removing the 0.25V offset electronic module.
  1. swing shift: finish BCM calibration. resume production
  1. owl shift: very productive. dummy target run toward the morning. some pedestals need attention/updating (SHMS hodoscope 2Y, HMS calo D...).

Number of good pions is 6633 (not counting overnight harvest).

Current Run Plan

  1. Maintenance day shifted to 11/03/2021. Acceleration retuning firmly scheduled for 11/05/2021-11/07/2021. all downtime starts at or around 08:00 so people/groups that need access in the Hall might want to take advantage of these periods.
  1. Continue data taking until early Nov

Current Issues

  1. Given the uncertainty associated with recent Hall A events it is not clear that the maintenance and retuning will happen as scheduled (Tu and Th, respectively). Need to follow this up with the scheduling committee.
  2. Replace flow switches for (HMS?) magnet power supplies: next opportunistic access (Joe Beaufait) ( PENDING )
  3. 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 .
  4. 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 .
  5. Target ladder camera was identified to be bad: Joe Beaufait will order camera ( PENDING )
  6. Still running with no UPS on the SHMS cryo controls - Steve L. has ordered batteries and UPS. ( PENDING )
  7. HCCAM02 not functioning (lift required to replace).

Special Requests

Useful Links