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</style><article id="node-1131984" 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/4058948" rel="bookmark">RC update and run plan, 14 Oct</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/4058948/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/4058948/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/4058948" class="lognumber" data-lognumber="4058948">4058948</a>. Submitted by <a href="https://logbooks.jlab.org/user/pking">pking</a> on <time datetime="2022-10-14T18:20:15-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1665782415&end_date=1665789615&book=HALOG">Fri, 10/14/2022 - 18:20</a></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>References: </th><td><a href="https://logbooks.jlab.org/entry/4058770">4058770 - RC early afternoon update, 14 Oct</a></td></tr></table></div>
<div class="logentry node-content">
<p>The hall is in beam permit, and beam restoration and harp scans are in progress. Initial conditions are with the target field off, SBS off, BigBite on.</p>
<p>Run plan<br />
===============<br />
1) Beam restoration<br />
2) Harp scans at 1H01, 1H04A, 1H04B to check beam spot size. Adjust beam spot size if needed<br />
3) Low current CW beam to check beam spot at the dump.<br />
4) Unrastered beam 5uA, on carbon hole target @ X=0.25, Y=-0.5, then go to +/- 0.5 mm in each of X and Y to verify rates are minimized at the nominal center<br />
5) Turn on raster, centering check on the carbon hole target , at +1mm in X from nominal center (X=1.25, Y=-0.5, if nothing has changed). Check raster size as compared to the hole, check centering.<br />
6) Raster on, carbon hole target, with 5uA beam at nominal center.<br />
7) Turn raster off on the carbon hole target, take a run and note the rates, then turn the target field on and take a run and note the rates.<br />
7B) If the raster-off rates are the same, then centering is the same; if they are not, take another run on the carbon hole offset by +1mm in X to reevaluate centering<br />
8) Go to no target, and test the ramp rate protection.<br />
9) Move to carbon optics target at nominal center, with target field off. Take a 5uA run to check raster uniformity<br />
10) Turn on the target field. Take a run to verify target field doesn't impact raster uniformity.<br />
11) If not too late, take a run to do a bullseye scan on carbon optics target with unrastered beam and harp scans for positions at the +/- 2mm corners from the nominal center. If<br />
12) Take target out, and start Moller polarimeter setup and polarization measurement. Don would like to be called ~1hr before this starts.<br />
13) After Moller backout is complete, go to the carbon hole target and take a run at 5uA with +1mm offset in X from nominal position to verify centering. Simona would like to be called when the Moller is ramping down.<br />
14) Turn on SBS to 100%. OPS will need to check the beam motion on the dump. Take a 5uA run on carbon hole run with +1mm offset in X from nominal position to verify centering.<br />
15) Go to target out, and try to ramp the beam current up as high as it can go with reasonable trip rates<br />
16) Do a BCM calibration with target out<br />
16) Take a run on the evacuated reference cell to check scraping. {What beam current? Or should this be a range of currents?}<br />
17) Go to the He-3 cell. Step the current up "slowly" {What maximum current, 40uA, 60uA? How will we decide when to stop?}</p>
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