[Hallc_running] [New Logentry] RC Daily Summary August 23, 2025

[ole at jlab.org]

Logentry Text:
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Data taking over the last 24 hours was quite productive, with a total ABU of 15.86 hours (66% efficiency). We finished the (short, 6 hour) z=0.90 pi- theta_pq=2.0 sequence and the (long, 16 hour) z=0.67 pi- theta_pq=2.0 sequence. As of 11am today, we are on the z=0.50 pi- theta_pq=2.0 setting that'll take at least two shifts to complete.

Updates from Accelerator:
- The box power supply for Arc 10 (aka ARCAA) trips due to oscillations. This prevents beam delivery to Hall D. Troubleshooting and repairs could be time-consuming (>= 1 shift) and will not be done before Monday: https://ace.jlab.org/dtm/open-events?event_id=21768
- Attempts to bring the Hall C current to 60 uA were thwarted by BLM trips, possibly due to noisy BCM signals: https://logbooks.jlab.org/entry/4448944. We currently can't go over 45 uA. However, MCC is attempting to work around the noise issue by raising the trip thresholds: https://logbooks.jlab.org/entry/4449178

Issues resolved:
- SMHS dipole interlock: https://logbooks.jlab.org/entry/4448324 https://logbooks.jlab.org/entry/4448331 https://logbooks.jlab.org/entry/4448341
- HMS dipole trip" https://logbooks.jlab.org/entry/4448934 https://logbooks.jlab.org/entry/4448940
- HMS NMR - field might have been off for run 25159: https://logbooks.jlab.org/entry/4448955

Current issues:
- Potentially bad SHMS preshower blocks: https://logbooks.jlab.org/entry/4448310

Shift summaries:
8/22 DAY: https://logbooks.jlab.org/entry/4448603
8/22 SWING: https://logbooks.jlab.org/entry/4448616
8/22 OWL: https://logbooks.jlab.org/entry/4448843

We'll have the RC meeting at 2:30 pm today (remote is fine)
Zoom link: https://jlab-org.zoomgov.com/j/1618227115?pwd=8JkhFg6YNesVc3HNgWjwUSIKIu5SvP.1
Dial-in: 833 568 8864
Meeting ID: 161 822 7115
Passcode: 253463


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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/4449195
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