[Halla_running] [Revised Logentry] Weekend Hall C RC Update

[Donald Jones]

L.    ... ml...........   》

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From: Halla_running <halla_running-bounces at jlab.org> on behalf of William Henry via Halla_running <halla_running at jlab.org>
Sent: Saturday, May 24, 2025 1:25:02 PM
To: halla_running at jlab.org <halla_running at jlab.org>
Subject: [Halla_running] [Revised Logentry] Weekend Hall C RC Update

Weekend Hall C RC Update<https://logbooks.jlab.org/entry/4382653>

Lognumber 4382653<https://logbooks.jlab.org/entry/4382653>. Submitted by wmhenry<https://logbooks.jlab.org/user/wmhenry> on Sat, 05/24/2025 - 13:14<https://logbooks.jlab.org/entries?start_date=1748103247&end_date=1748110447&book=HALOG&book=ELOG>.

Last updated on Sat, 05/24/2025 - 13:20

Logbooks:       HALOG<https://logbooks.jlab.org/book/halog> ELOG<https://logbooks.jlab.org/book/elog>

The goal the accelerator had mid-week was to get all four halls running for the long holiday weekend and they did just that. Excellent work!

Beam checkout was completed around 6 pm last night. Harp scans showed the beam size to be larger than desired after 2 hours of tuning by MCC. After discussion with spokespeople, it was decided to proceed with a beam sigma of 0.64 x 0.34 mm but do an additional check with the 5mm hole to ensure beam halo was under control (https://logbooks.jlab.org/entry/4382121), this result was "surprising good". Next week MCC will look at improving the optics.

During swing, the straight thru carbon runs for GEM alignment were completed. Then, GEM HV studies which also counts as production data. The result of the study was an increase in some HV channels but after a sector overnight was lost they backed out of some of these changes.

Production running continued overnight and into this morning. We collected 0.6 C of charge (3.8 total at this kinematic thus far). The plan for the remainder of the weekend is production running at 18 uA. There will be no RC meetings, enjoy the holiday
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