[Halla_running] [New Logentry] RC Report for 22-Jun-2025

[covrig at jlab.org]

Logentry Text:
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Key updates for the past 24h ( Sat Day and Swing and Sun Owl):
 - CC and PD: quiet past 24h, beam delivery was 22-of-24h for physics. Major beam downtime for ~40min this morning around 7:30am with a cavity trip.
 - On our side, Day and Swing lost about 2h combined on daq crashes and recovery, while Owl lost 4h on daq crashes and recovery! Over the past 24h we burned 30% of beam-on-target time unable to take data due to daq crashes and recovery!
 - HCAL threshold changes during the weekend to assess if we can bump the beam current higher than 22 µA on Mon
 - SL please note that the primary daq expert, Alexander, is on vacation until Jul 10. During this time primary daq on-call will be C.H. Leung (217-693-1360), and second line will be Chandan (757-342-4035).

 - Total Accumulated Charge at Kin3 so far: 29.18 C (Goal: 100 C)
 - Total Accumulated Charge at Kin3 since June 18 Swing: 4.18 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,_Sunday,_June_22nd

Current issues:
 - Plagued still by daq crashes, during the last 24h we seem to have wasted 30% of beam time on daq crashes and recovery. The 4h of beam time lost during Owl shift seem to have been caused by an unresponsive power strip in the Hall. Once the crates connected to it were commented out in software, we were able to take data for the rest of Owl. Ching Him (SL for Day today) took an opportunistic access to the Hall, power cycled the strip locally and the crates connected to it seem to be able to take data:  https://logbooks.jlab.org/entry/4403280
 - APV baseline sagging/broadening: HV test showed a significant reduction of the width at lower gain.
 - Online zero suppression performance (common-mode min values for online zero suppression were changed to zero for the first iteration of averaging until we are ready to deploy ROI readout and histogramming firmware).
 - HCAL calibration/trigger efficiency, almost complete, still waiting on replays to finish.

Shift summaries:
21-Jun-2025 D https://logbooks.jlab.org/entry/4402562
21-Jun-2025 S https://logbooks.jlab.org/entry/4402766
22-Jun-2025 O https://logbooks.jlab.org/entry/4402956 (grim reading)

Shift BTA:
21-Jun-2025 D https://logbooks.jlab.org/entry/4402759
21-Jun-2025 S https://logbooks.jlab.org/entry/4402954
22-Jun-2025 O https://logbooks.jlab.org/entry/4403215

If you have an issue pertinent to operations, please reach out on the RC phone: 757-876-1787. No Rc daily meeting today, 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/4403352
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