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<a href="https://logbooks.jlab.org/entry/3926784" rel="bookmark" style="font-size: 1.6em; font-family: "Trebuchet MS", "Helvetica Neue", Arial, Helvetica, sans-serif;">RC Update and plan for today</a><br>
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<p class="author-datetime">Lognumber <a href="https://logbooks.jlab.org/entry/3926784" class="lognumber">
3926784</a>. Submitted by <a href="https://logbooks.jlab.org/user/pking">pking</a> on
<time datetime="2021-10-17T13:32:16-0400"><a href="https://logbooks.jlab.org/entries?start_date=1634488336&end_date=1634495536&book=HALOG">Sun, 10/17/2021 - 13:32</a></time>.
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<p>We have been running overnight with the SBS dipole in positive polarity at 50%. The shift crews are maintaining the list of runs on the wiki at
<a href="https://sbs.jlab.org/wiki/index.php/Run_Log">https://sbs.jlab.org/wiki/index.php/Run_Log</a></p>
<p>At about 12:00, we changed the SBS setting to negative polarity at 25% (<a href="https://logbooks.jlab.org/entry/3926714">https://logbooks.jlab.org/entry/3926714</a> and
<a href="https://logbooks.jlab.org/entry/3926736">https://logbooks.jlab.org/entry/3926736</a>). We checked the target centering and set the target lock for Y=0.4 (<a href="https://logbooks.jlab.org/entry/3926759">https://logbooks.jlab.org/entry/3926759</a>).
This is 0.3mm lower than we were running with SBS=+50%, and is the same as we'd been running a few days ago for the SBS off. I was expecting to have to steer further down, but the centering looked good here.<br>
The total time for a SBS setting change is about 45 minutes from taking the cryo target out to having beam back on the cryo target.</p>
<p>Run 11276 is the first run on LH2 at 5uA with the new SBS setting.</p>
<p>We will have an RC meeting today at 3:15pm to discuss status of all subsystems and finalize our plans for beam before our 1-pass beam shuts down tomorrow morning.</p>
<p>Plan for this afternoon<br>
=================<br>
Take ~hour long runs at 5uA on the LH2 target.<br>
At some point, we will do a threshold scan for BBCal.</p>
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