[Alert_collaboration] [New Logentry] RC Daily Summary

Sat May 10 12:00:02 EDT 2025

Logentry Text:
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<div id="content"><h1 id="rc-summary-for-2025-05-10---sat-may-10">RC Summary for 2025-05-10 - Sat May 10</h1>
<p><strong>NO RC MEETING TODAY</strong></p>
<h2 id="recap-and-status">Recap and Status</h2>
<h4 id="fri-may-9-dayhttpslogbooksjlaborgentry4371841--swinghttpslogbooksjlaborgentry4372170">Fri May 9 <a href="https://logbooks.jlab.org/entry/4371841">DAY</a> & <a href="https://logbooks.jlab.org/entry/4372170">SWING</a></h4>
<ul>
<li>Beam restoration complete, harp scans looking beautuful (<a href="[https://logbooks.jlab.org/entry/4371838](https://logbooks.jlab.org/entry/4371838%C2%A0)">2H01</a>, <a href="https://logbooks.jlab.org/entry/4371849">Tagger/2C24a</a>), and <a href="https://logbooks.jlab.org/entry/4371844">2C21</a>)</li>
<li>Careful transition to production: 30nA runs + fill target</li>
<li>Switch to production around 9:20am - 325nA runs on 4-He (100M event runs)</li>
<li>Took production runs on-and-off as they were struggling to deliver beam to Hall A, and also trying to bring up Hall C<ul>
<li>Had issue with with beam position during DAY tripping halo FSDs, which were a bit better when operator addressed issue in the separator near end of DAY</li></ul></li>
</ul>
<h4 id="sa-may-9-owlhttpslogbooksjlaborgentry4372477">Sa May 9 <a href="https://logbooks.jlab.org/entry/4372477">OWL</a></h4>
<ul>
<li>Started without beam, issues with beam steering. </li>
<li>Halo FSDs tripped with no beam (seeing bleed-through from Hall A due to scraping)</li>
<li>Attempted to re-establish beam all night without success<ul>
<li>At this point can't even get above 5nA without setting off Halo FSDs due to beam quality</li></ul></li>
</ul>
<h4 id="sa-may-10-start-of-dayhttpslogbooksjlaborgentry4372664">Sa May 10 start of <a href="https://logbooks.jlab.org/entry/4372664">DAY</a></h4>
<ul>
<li>Accelerator down due to trip of PSU in ARC-A</li>
<li>Accelerator will focus on tracking down the optics issues that are thought to be the cause of the bad beam quality</li>
<li>Note that the laser issues with the Hall A laser in the injector have not been addressed and could also be related to what we are seeing</li>
<li>Released DAY worker as it will hours before they will attempt to deliver beam to the Hall</li>
</ul>
<h2 id="game-plan">Game Plan</h2>
<ul>
<li><a href="https://wiki.jlab.org/clas12-run/index.php/Run_Group_L#tab=Short_Term_Schedule">Short Term Schedule</a></li>
<li>Production runs with He-4 until Wednesday, aim for 100M events<ul>
<li>Perform Hall A bleed-through test for ~5 minutes once Hall A is in stable running conditions with 20µA beam</li></ul></li>
<li>Wednesday start ALERT repairs during SAD</li>
</ul>
<h2 id="bta">BTA</h2>
<ul>
<li>327.1 ABU hours since April 5th. 327.1/(68.5 x 24) = 19.9%</li>
<li>We are on day 35 of 137 scheduled days: 35/137 = 25.5%</li>
<li>BANU: 0.7 (beam restoration & DAQ)</li>
</ul>
<h2 id="outstanding-major-tasks">Outstanding Major Tasks</h2>
<ul>
<li>Repairs planned for Wednesday, May 14th:<ul>
<li>ATOF module 7 (Whitney Armstrong)</li>
<li>AHDC wire repair (Raphael Dupre)</li>
<li>Draft of repair plans is available to all relevant people to make sure the repairs follow proper procedures and to ensure smooth execution and minimal downtime.</li></ul></li>
<li>Faraday Cup Vacuum to be monitored, to be fixed after end-of-run</li>
</ul>
<h2 id="run-summary">Run Summary</h2>
<ul>
<li>Run 21781 on He-4 - 100M events</li>
<li>Run 21782 on He-4 - 100M events</li>
<li>Run 21783 on He-4 - 46M events, stopped due to DCHV trips</li>
<li>Run 21784 on He-4 - 9.5M events, stopped due accelerator downtime</li>
<li>Run 21785 on He-4 - 16MM events, stopped due accelerator downtime</li>
<li><del>Run 21786 on He-4</del> - DAQ failure</li>
<li>Run 21787 on He-4 - 70MM events, stopped for ROC reboot (ROC dc11 busy)</li>
</ul>
<h2 id="links">Links</h2>
<ul>
<li><a href="https://jlab-org.zoomgov.com/j/1605705819#success">RC Meeting Zoom Link</a> (no meeting today!)</li>
<li><a href="https://wiki.jlab.org/clas12-run/index.php/Run_Group_L">ALERT/RG-L Wiki</a></li>
<li><a href="https://wiki.jlab.org/clas12-run/index.php/Run_Group_L#:~:text=General-,Logbook,-Shift%20Schedule">Hall B Logbook</a></li>
<li><a href="https://wiki.jlab.org/clas12-run/index.php/Run_Group_L#tab=Short_Term_Schedule">Short Term Schedule</a></li>
</ul></div>

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