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</style><article id="node-602058" class="node node-logentry article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/3529183" rel="bookmark">RC Update</a>
</h1>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3529183" class="lognumber" data-lognumber="3529183">3529183</a>. Submitted by <a href="https://logbooks.jlab.org/user/hszumila">hszumila</a> on <time datetime="2018-02-08T09:10:59-0500" pubdate="pubdate">Thu, 02/08/2018 - 09:10</time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hclog">HCLOG</a></td></tr></table></div>
<div class="logentry node-content">
<p>After cryo issues yesterday morning, we had to reset a valve at 3H07: <a href="https://logbooks.jlab.org/entry/3528688">https://logbooks.jlab.org/entry/3528688</a></p>
<p>Just before lunch, we started to get beam. Beam was tripping throughout day shift at 40 uA. Beam was pretty unstable during swing shift so the current was lowered to 35 uA. At about 10:40pm, the power supply to the vertical raster B coil failed. Bill G replaced the the power supply with a Bicron (<a href="https://logbooks.jlab.org/entry/3528954">https://logbooks.jlab.org/entry/3528954</a>). This is the same one that had to be replaced during Saturday owl (<a href="https://logbooks.jlab.org/entry/3526189">https://logbooks.jlab.org/entry/3526189</a>). Around 1:45am, we saw that raster is working and we requested CW beam (<a href="https://logbooks.jlab.org/entry/3529031">https://logbooks.jlab.org/entry/3529031</a>). When Hall A was not receiving beam, ours was pretty stable. We stabilized at 45 uA. Around 3am, 2L07 block tripped, and the beam was taken away until 5:30am. Beam was better after this time because Hall A was off. </p>
<p>Beam strip charts show beam currents above 50 uA on 6% C from time to time: <a href="https://logbooks.jlab.org/entry/3529140">https://logbooks.jlab.org/entry/3529140</a>. </p>
<p>From meeting this morning, priority will be to resolve the issues between Halls A and C so that we can both receive high current beam. The problem is due to the beams not being collinear when coming out of the injector so there is expected to be some 2 hour down time this morning when the injector experts can align the beams. </p>
<p>We will meet in 200C at 1:30 pm (second floor of the counting house).</p>
<p>Link: <a href="https://bluejeans.com/543903672">https://bluejeans.com/543903672</a><br />
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