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<a href="https://logbooks.jlab.org/entry/4429733" rel="bookmark">RC Summary July 28 - July 29 Owl</a>
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Lognumber <a href="https://logbooks.jlab.org/entry/4429733" class="lognumber" data-lognumber="4429733">4429733</a>. Submitted by <a href="https://logbooks.jlab.org/user/schmidta">schmidta</a> on <time datetime="2025-07-29T08:50:54-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1753789854&end_date=1753797054&book=HBLOG">Tue, 07/29/2025 - 08:50</a></time>. </p>
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<tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hblog">HBLOG</a></td></tr>
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<p>This is the RC summary for Day Shift July 28 through Owl shift July 29.</p>
<p>Over the last 24 hours, we returned to our smooth running ways. The only interruptions were the usual mix of DAQ trouble, trips, which were recovered quickly. </p>
<p>Two things I want to note in case they are significant. Over owl shift, the double peak structure in the TDC phase plot reverted to a single peak again. A DAQ reset fixed the issue. Also during owl shift, there was an alarm caused by a spike in the gas flow rate to the FTC, which quickly subsided. (<a href="https://logbooks.jlab.org/entry/4429624">https://logbooks.jlab.org/entry/4429624</a>). I do not understand what might cause this or if it is significant, but I'm glad the flow quickly went back in range.</p>
<p>- 7/28 day shift summary: <a href="https://logbooks.jlab.org/entry/4428878">https://logbooks.jlab.org/entry/4428878</a><br />
- 7/28 swing shift summary: <a href="https://logbooks.jlab.org/entry/4429161">https://logbooks.jlab.org/entry/4429161</a><br />
- 7/29 owl shift summary: <a href="https://logbooks.jlab.org/entry/4429428">https://logbooks.jlab.org/entry/4429428</a></p>
<p>ABU for last 24h</p>
<p>- 17.4h of ABUs ~ 72.5% efficiency,</p>
<p>- Total ABUs since April 5th: 1236.9+17.4=1254.3 --> 1254.3 / (75.5 * 24) = 69.2%</p>
<p>- Day 115 of 151 scheduled: 115/151= 76.1%</p>
<p>- BANU: 2.1h due to trips, DAQ issues.</p>
<p>Plan for today:<br />
There will be an RF separator test beginning at 10 AM. When beam is taken away (approx. 10:30 - 11:00), we will:<br />
* Switch the target from the helium-4 to hydrogen, with 10 purge cycles to really make sure to remove all traces of He-4.<br />
* Ramp up the tagger magnet to prepare for Moller runs<br />
When beam comes back, we'll do two Moller runs, one with each target polarization setting.<br />
Then we will resume production on hydrogen.</p>
<p>RC meeting:</p>
<p>We will meet as usual today at 11:30 (EST) in CH Room 200C and online via Zoom<br />
Zoom meeting ID: 160 570 5819<br />
Zoom Link: <a href="https://jlab-org.zoomgov.com/j/1605705819">https://jlab-org.zoomgov.com/j/1605705819</a></p>
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