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</style><article id="node-996424" class="node node-logentry contextual-links-region article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/3923408" rel="bookmark">RC Update: Summary of Tuesday Swing and Wednesday Owl, Plans for Wednesday Day</a>
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</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/3923408/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3923408/delete?destination=email/send">Delete</a></li></ul></div>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3923408" class="lognumber" data-lognumber="3923408">3923408</a>. Submitted by <a href="https://logbooks.jlab.org/user/flay">flay</a> on <time datetime="2021-10-13T08:57:01-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1634126221&end_date=1634133421&book=HALOG">Wed, 10/13/2021 - 08:57</a></time>. </p>
<p class="last-update">
Last updated on <time datetime="2021-10-13T09:01:32-0400" pubdate="pubdate">Wed, 10/13/2021 - 09:01</time></p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/halog">HALOG</a></td></tr><tr><th>Entry Makers: </th><td>flay</td></tr></table></div>
<div class="logentry node-content">
<p>We had a busy Swing and Owl shift working on establishing first beam into the hall. The details are below: </p>
<p>Goals for Tue Swing and Wed Owl<br />
- Beam steering to the dump<br />
- Dump ion chamber calibration (empty target scans) for beam currents up to 10 uA<br />
- Ion chamber calibration on Optics 5-foil<br />
- Beam centering on Carbon hole (2-mm)<br />
- Raster and BPM calibrations<br />
- Turn on GEMs and start detector commissioning/optics program</p>
<p>Summary of Swing and Owl</p>
<p>We got beam into the hall from around 20:00, and Ops worked on<br />
steering the beam to the dump from 20:30. Harp scans<br />
were performed at 21:40 (<a href="https://logbooks.jlab.org/entry/3923094">https://logbooks.jlab.org/entry/3923094</a>);<br />
initially the raster was in an indeterminate state and was cycled<br />
prior to this. From about 22:15 Ops performed empty target scans<br />
to calibrate the dump ion chambers. A lot of optics work deep into<br />
Owl shift to reduce the beam size, which was about 100 um x 600 um<br />
after the last harp scans at 05:00 (<a href="https://logbooks.jlab.org/entry/3923330">https://logbooks.jlab.org/entry/3923330</a>).<br />
The desired size is 200--300 um for our program; Ops and Optics teams<br />
will continue the effort to optimize the beam size when beam<br />
comes back on Swing shift.</p>
<p>In the counting house, we found that the sbsvme29 crate was crashing the CODA runs, and was taken out of the configuration.<br />
Looking at spot++ (on the LHRS data), we see that one of our raster signals (upstream Y) is effectively missing (<a href="https://logbooks.jlab.org/entry/3923220">https://logbooks.jlab.org/entry/3923220</a>).<br />
Paul and I have ideas on what might be going wrong here; additionally, the EPICS raster data looks good (<a href="https://logbooks.jlab.org/entry/3923223">https://logbooks.jlab.org/entry/3923223</a>),<br />
so we think it's on our end, and *not* a problem with the raster. Paul and I will investigate on Day shift. </p>
<p>Plan for Day Shift</p>
<p>We scheduled a rad survey this morning (~07:30) so we can transition to controlled<br />
access for the day shift (until 16:00). The BigBite magnet will be LOTO'd<br />
by Jessie for the shift. The major activities are:</p>
<p>- SBS magnet testing (Jack)<br />
- GEM gas setup (Jack, Zeke or other GEM expert)<br />
- GRINCH gas setup (Todd, Bradley)<br />
- LHRS beam signal investigations (Paul and DF)<br />
- HCAL hardware checks (Scott or Sebastian)</p>
<p>As usual, we have 10 keys for accesses so we'll manage the work accordingly. SBS magnet testing is the priority. </p>
<p>Plan for Swing and Owl</p>
<p>- Close up the Hall at 16:00<br />
- Resume our program from last night where Ops/Optics teams will optimize the beam delivery for us<br />
and we'll get into our beam centering as listed at the top of this entry.</p>
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