[Hallc_running] [New Logentry] Re: RC Daily Summary August 27, 2025

[ole at jlab.org]

Logentry Text:
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Yesterday during DAY, accelerator carried out the Hall C Fast Feedback checkout, which went well (https://logbooks.jlab.org/entry/4451146). In the early afternoon, Dave Mack did the BCM calibration (https://logbooks.jlab.org/entry/4451228). Near the end of DAY, beam went away for about 3 hours to bring the repaired box power supply for Arc10 back online, which is required for sending beam to Hall D (https://logbooks.jlab.org/entry/4451265). Accelerator had a minor problem during SWING, resulting in 2 hours without beam. Beam was turned off to all halls at 5:30 in the morning in preparation for today's maintenance day (https://logbooks.jlab.org/entry/4451693). Because of these various events, we were only able to log 10 ABU hours over the last 24 hours (8am-8am)—42% efficiency. Nevertheless, we finished the z=0.50 pi+ theta_pq=2.0 kinematics mid-OWL, around 2am, and moved on to the last pi+ setting, z=0.36, for which we already have taken the LD2 SIDIS runs at full and half 
 current.

Updates from accelerator:
- Maintenance, beam studies, and RF recovery today. The task list is extensive. Beam is not expected back until 23:00 tonight.
- Hall B pass change and Wien filter angle change tomorrow during DAY

Analysis updates:
- Some recent z=0.50 pi- data, which turn out to be particularly important, were found to be unusable (thanks Peter Bosted for discovering this!) due to mysteriously misconfigured SHMS magnets (https://logbooks.jlab.org/entry/4451739). It should be easy, albeit time-consuming (ca. 4 hours), to retake these data in the coming days as we will stay at 5-pass beam energy.

Hall status:
- Restricted access for a tour this morning, until about noon.
- 13:00-14:00 safety walkthrough
- LAD decabling work (after tour complete).
- Hall should be accessible until at least 15:00

Shift summaries:
8/26 DAY: https://logbooks.jlab.org/entry/4451055
8/26 SWING: https://logbooks.jlab.org/entry/4451475
8/27 OWL: https://logbooks.jlab.org/entry/4451510

We will have the regular RC meeting at 2:30 pm today in the counting house conference room.
Zoom link: https://jlab-org.zoomgov.com/j/1618227115?pwd=8JkhFg6YNesVc3HNgWjwUSIKIu5SvP.1
Meeting ID: 161 822 7115
Passcode: 253463
Dial-in: 833 568 8864

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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/4451777
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