[Halla_running] [New Logentry] RC Report for 25-Jun-2025

[covrig at jlab.org]

Logentry Text:
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Key updates for the past 24h (Tue Day+Swing and Wed Owl):
 - 14.47h actual beam delivery on target. The beam was down for 9.5h with major culprits 1L18 breaker MDP tripped off, 5.18h ( https://ace.jlab.org/dtm/incidents/14999), cooling water chillers 2.5h (https://logbooks.jlab.org/entry/4404500)
 - During late Swing and early Owl we did a high beam current test for about 4h, increasing the beam current in steps of 5 µA to 35 µA (where the daq dt was about 50%). The tests were supervised by Nilanga (in the CH). We expect the analysis to get back to us within a week as to where we stand with respect to increasing the beam current as high as acceptable.
 - On our side we were down for 3.1h during beam delivery, which accounts for 21.5% of wasted beam time.
 - Beam studies today 7-9am, then RF recovery until mid afternoon with beam recovery after. The Hall will go to CA with access to the Hall scheduled after 9am.
 - IHWP changed just before beam studies began this morning
 - Thu Day there are plans for beam studies during beam delivery to test two settings of the Wien filter (for MOLLER). The Halls are "required" to take data during this time, maybe tag it, and report about the effects (if any). MCC will announce when the Wien tests will start and stop, to give Halls time to prepare for daq.
 - DAQ on-call until Jul 10: primary C. H. Leung (217-693-1360), secondary Chandan (757-342-4035).

 - Total Accumulated Charge at Kin3 so far: 32.241 C (Goal: 100 C)
 - Total charge delivered on target since Jun 18 noon: 9.6 C
 - Total Accumulated Charge at Kin3 since June 18 noon: 7.241 C
 - Charge acquisition efficiency 75%

Run plan:
 - Beam studies 7-9am, to test the MOLLER ffb, beam to HA expected, Target in Out-of-Beam position
 - CA for the rest of Day shift: several groups want to access the Hall (ECal, GEMs, daq), Safety Walkthrough, Moller polarimeter daq, ...
 - Beam recovery during Swing
 - Production on LH2 at 22-25 µA on the 30 cm LH2 target cell (loop 1), updates on subsystems on: https://sbs.jlab.org/wiki/index.php/RC_meeting_and_Run_Plan,_Wednesday,_June_25th#Current_Issues

Current issues:
 - DAQ crashes: the last 24h we wasted 3.1h (evenly between Swing and Owl, there was no beam during Day) due to them or 21.5% of actual beam delivery.
 - 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:
 24-Jun-2025 D https://logbooks.jlab.org/entry/4404564
 24-Jun-2025 S https://logbooks.jlab.org/entry/4404808
 25-Jun-2025 O https://logbooks.jlab.org/entry/4405030

Shift BTA:
 24-Jun-2025 D https://logbooks.jlab.org/entry/4404786
 24-Jun-2025 S https://logbooks.jlab.org/entry/4405035
 25-Jun-2025 O https://logbooks.jlab.org/entry/4405302

We will have our daily RC meeting at 1pm in the conference room on the second floor of the CH and on zoom. It seems that the currently going JLUO has a lunch break until 14:00, so it should not affect our RC meet.
Zoom info:
Join ZoomGov Meeting
https://jlab-org.zoomgov.com/j/1616220064
Meeting ID: 161 622 0064
Passcode: 314159

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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/4405404
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