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<a href="https://logbooks.jlab.org/entry/3927026" rel="bookmark" style="font-size: 1.6em; font-family: "Trebuchet MS", "Helvetica Neue", Arial, Helvetica, sans-serif;">RC Update and plan for swing and owl</a><br>
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<p class="author-datetime">Lognumber <a href="https://logbooks.jlab.org/entry/3927026" class="lognumber">
3927026</a>. Submitted by <a href="https://logbooks.jlab.org/user/pking">pking</a> on
<time datetime="2021-10-17T20:21:29-0400"><a href="https://logbooks.jlab.org/entries?start_date=1634512889&end_date=1634520089&book=HALOG">Sun, 10/17/2021 - 20:21</a></time>.
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<p>Through the afternoon, we collected several hours of data with 5uA on LH2 with the SBS magnet set in negative polarity at 25% full current.</p>
<p>A little after 17:00, we performed a threshold scan for BBCal with 5uA of beam on LH2 (<a href="https://logbooks.jlab.org/entry/3926919">https://logbooks.jlab.org/entry/3926919</a>).</p>
<p>We then changed the BigBite magnet from 750A to 375A (<a href="https://logbooks.jlab.org/entry/3926924">https://logbooks.jlab.org/entry/3926924</a>), and took run 11284 for 15 minutes. We then restored BigBite to the nominal 750A current ().</p>
<p>We requested the SBS magnet and correctors to be turned off (<a href="https://logbooks.jlab.org/entry/3926931">https://logbooks.jlab.org/entry/3926931</a> and
<a href="https://logbooks.jlab.org/entry/3926936">https://logbooks.jlab.org/entry/3926936</a>), then checked centering on the 2mm hole target (<a href="https://logbooks.jlab.org/entry/3926957">https://logbooks.jlab.org/entry/3926957</a>). We chose to put the
lock positions at (-0.8, 0.5) on both BPMs.</p>
<p>We took 30 minutes of LH2 data at 5uA in run 11287.</p>
<p>We have now made a change in the GEM HV settings using the values specified in
<a href="https://logbooks.jlab.org/entry/3926899">https://logbooks.jlab.org/entry/3926899</a>, and are taking ~10 minute runs at 1uA beam current increments to monitor the GEM current stabilty and determine occupancies and efficiencies.</p>
<p>Plan for this evening and overnight<br>
==========================<br>
1. Complete the incremental beam current runs to check the GEM performance with the new voltages</p>
<p>2. Take a run with only the coincidence trigger (T3) active. About 20 minutes with 5uA on the LH2 target.</p>
<p>3. Restore prescales to have BBCal only (T1). Take ~1 hr long runs at 5uA on LH2. This would be with SBS off for the whole night (unless the plan changes).</p>
<p>4. We should stop the beam at 05:30 to allow radiation to decay before the survey for hall access.<br>
After we stop the beam, we should ramp BigBite to zero and push "power off". Log that was done.<br>
If we have turned SBS on during the night, you should ask OPS to ramp it down and turn off the power.<br>
The survey is expected to be done to allow the hall to go to restricted access by about 08:00.</p>
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