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</style><article id="node-682637" 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/3609744" rel="bookmark">RC daily update</a>
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</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/3609744/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3609744/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/3609744" class="lognumber" data-lognumber="3609744">3609744</a>. Submitted by <a href="https://logbooks.jlab.org/user/efuchey">efuchey</a> on <time datetime="2018-10-15T09:50:30-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1539607830&end_date=1539615030&book=HALOG">Mon, 10/15/2018 - 09:50</a></time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/halog">HALOG</a></td></tr></table></div>
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<p>We have had many problems over the past 24 hours:<br />
First, the raster failed us again, now for good (<a href="https://logbooks.jlab.org/entry/3609311">https://logbooks.jlab.org/entry/3609311</a>).<br />
Bill went down to swap power supply for a spare, which also turned out to be problematic (<a href="https://logbooks.jlab.org/entry/3609360">https://logbooks.jlab.org/entry/3609360</a>, <a href="https://logbooks.jlab.org/entry/3609393">https://logbooks.jlab.org/entry/3609393</a>, <a href="https://logbooks.jlab.org/entry/3609429">https://logbooks.jlab.org/entry/3609429</a>, <a href="https://logbooks.jlab.org/entry/3609436">https://logbooks.jlab.org/entry/3609436</a>).<br />
Realizing he had no good spare, we decided under his suggestion to use only the downstream set of magnets (<a href="https://logbooks.jlab.org/entry/3609472">https://logbooks.jlab.org/entry/3609472</a>). This is an option we could use only because we will run at low energy until the end of the run. After this had been administratively approved, we went and adjusted the raster size with carbon hole (<a href="https://logbooks.jlab.org/entry/3609474">https://logbooks.jlab.org/entry/3609474</a>).<br />
Just after we moved the target to helium 3 to resume production, The scattering chamber vacuum started to fail (<a href="https://logbooks.jlab.org/entry/3609486">https://logbooks.jlab.org/entry/3609486</a>, <a href="https://logbooks.jlab.org/entry/3609494">https://logbooks.jlab.org/entry/3609494</a>). Attempt had been made to isolate the scattering chamber (close the upstream and downstream valves), but it had little to no effect. Dave checked downstairs, and took the decision to warm up the target. Experiment is off until issue is fixed - sigh (<a href="https://logbooks.jlab.org/entry/3609522">https://logbooks.jlab.org/entry/3609522</a>).<br />
Also, of course we overlooked to shut down the HRS magnets, and they dumped on us, and we tripped Hall C magnets (sorry...) Lucky we didn't dump the whole ESR...</p>
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