RC Meeting, Wednesday, October 21 , 2021

RC Meeting Information

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

Accelerator Status

1. Accelerator went down after LCW issue in the SAB last night. Water conductivity remained too high to restore beam until this morning. Photos: https://logbooks.jlab.org/entry/3928348
2. Accelerator maintenance day underway
   1. Work in tunnel until mid-afternoon
   2. Lock up machine, RF recovery (several hours)
   3. Beam restoration
   4. Beam to halls by midnight (if all goes well)
3. Another pass change on Friday (Hall A to 4 pass) -> maybe this will change?

Hall C Status

1. So far we have collected about 3868 pions (as of 7:30 am) in this configuration
2. Hall C is in Controlled Access

Current Run Plan

1. Upon beam restoration, execute the abbreviated beam restoration procedure outlined here: https://logbooks.jlab.org/entry/3928364
2. Continue data taking until early Nov

Current Issues

1. Replace flow switches for (HMS?) magnet power supplies: next opportunistic access (Joe Beaufait) ( PENDING )
2. HB LHe has been stable since Saturday owl -> some valve adjustments on Monday
3. Target ladder camera was identified to be bad: Joe Beaufait will order camera ( PENDING )
4. Still running with no UPS on the SHMS cryo controls - Steve L. will put in PR for batteries and UPS. ( PENDING )
5. HCCAM02 not functioning (lift required to replace).

Useful Links

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