[Halla_running] [New Logentry] RC Report for 21-Jun-2025

[covrig at jlab.org]

Logentry Text:
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Key updates for the last 24h:
 - CC and PD are happy, beam delivery has been good over the past 24h. Major beam downtime for 2.8h during Day on Fri to repair 2L18 today. Beam back for production since 14:25 on Fri.
 - On our side, we are still plagued by daq crashes and recoveries, of the 14.5 ABUs for the last 24h, we wasted 5.24h on daq crash/recovery or 36% of beam time!
 - HCAL threshold changes during the weekend to assess if we can bump the beam current higher than 22 µA on Mon

 - Total Accumulated Charge at Kin3 so far: 27.99 C (Goal: 100 C)
 - Total Accumulated Charge at Kin3 since June 18 Swing: 2.99 C

Run plan: Production on the 30 cm LH2 target cell (loop 1) at 22 µA, also on the wiki: https://sbs.jlab.org/wiki/index.php/RC_meeting_and_Run_Plan,_Saturday,_June_21st

Current issues:

 - Over a 24h period we seem to waste more than 30% of beam-on-target with daq crashes and recoveries, which is an enormous penalty on statistics. Yesterday, during the daily RC meeting, it was suggested by the daq expert to reboot all crates in between two 4h runs, believing that such a procedure would make daq more stable. A daq "panic button" (https://logbooks.jlab.org/entry/4402072) was implemented and SLs were instructed to use it at the end of each 4h run, before starting a new run. Two things have become apparent since Swing 20-Jun-2025: the panic button does not always work as intended (https://logbooks.jlab.org/entry/4402271), and the daq is not more stable during a 4h run, still crashing with various issues. Today's Owl shift wasted 42.5% of beam time on daq issues.
 - Gentle reminder for shift-takers: Please put the RC phone and HA CH phone numbers (SL x5501, TO x5507) on you phone and please call the RC if you cannot make it on time for your shift. During summer traffic can be heavy accessing the lab.

Shift summaries:
20-Jun-2025 D https://logbooks.jlab.org/entry/4401825
20-Jun-2025 S https://logbooks.jlab.org/entry/4402157
21-Jun-2025 O https://logbooks.jlab.org/entry/4402320

Shift BTA:
20-Jun-2025 D https://logbooks.jlab.org/entry/4402117
20-Jun-2025 S https://logbooks.jlab.org/entry/4402293
21-Jun-2025 O https://logbooks.jlab.org/entry/4402554

If you have an issue pertinent to operations, please reach out on the RC phone: 757-876-1787. No RC meeting today and tomorrow, enjoy your weekend!


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This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/4402683
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