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</style><article id="node-644245" 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/3571358" rel="bookmark">RC daily update</a>
</h1>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3571358" class="lognumber" data-lognumber="3571358">3571358</a>. Submitted by <a href="https://logbooks.jlab.org/user/simona">simona</a> on <time datetime="2018-05-03T12:36:20-0400" pubdate="pubdate">Thu, 05/03/2018 - 12:36</time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hclog">HCLOG</a></td></tr><tr><th>Entry Makers: </th><td>simona</td></tr></table></div>
<div class="logentry node-content">
<p>About 20 minutes before 5 pm yesterday the main router went down and this impacted operations severely. </p>
<p>Here is a list of entries that explain the symptoms and consequences of what happened on the accelerator and cryo side and show the progression of the recovery so far:</p>
<p>general entry from accelerator operator summarizing what happened: <a href="https://logbooks.jlab.org/entry/3571073">https://logbooks.jlab.org/entry/3571073</a></p>
<p>updates on the router recovery: <a href="https://logbooks.jlab.org/entry/3571121">https://logbooks.jlab.org/entry/3571121</a> and <a href="https://logbooks.jlab.org/entry/3571124">https://logbooks.jlab.org/entry/3571124</a></p>
<p>update on controls recovery: <a href="https://logbooks.jlab.org/entry/3571212">https://logbooks.jlab.org/entry/3571212</a> , <a href="https://logbooks.jlab.org/entry/3571273">https://logbooks.jlab.org/entry/3571273</a></p>
<p>updates on cryo: <a href="https://logbooks.jlab.org/entry/3571068">https://logbooks.jlab.org/entry/3571068</a>, <a href="https://logbooks.jlab.org/entry/3571058">https://logbooks.jlab.org/entry/3571058</a></p>
<p>On the Hall C side and related to the router outage: we lost target controls for a while but the targets stayed stable (we switched loop 2 and 3 to the aux HPH). The HMS and SHMS magnets suffered no impact from the incident.</p>
<p>Unrelated to the router issue, cdaql3 hung few minutes before 4 pm and it had to be rebooted (the reboot was completed in about 2 hours).</p>
<p>From MCC meeting this morning:</p>
<p>Recovery from the router outage continues. The accelerator experienced some hardware failures and those were being addressed. The plan was to continue with the pass change for Hall A and go through beam restoration to all halls once all the issues are addressed (a list of issues to be addressed from the PD is shown here: <a href="https://accweb.acc.jlab.org/presenter/presentation/5523#2">https://accweb.acc.jlab.org/presenter/presentation/5523#2</a> ) .<br />
The best guess for beam restoration to Hall C as of this morning was sometime during the swing shift. </p>
<p>Since the MCC 8 am meeting the CHL1 tripped (around 9 am) and now the South Linac is down. I just got an update from the Crew Chief: the pump-down of the SL started about 1 hour ago. The hope is still to restore beam to C sometime during the swing shift.</p>
<p>Lastly, there was more work done on the SHMS Heavy Gas Cherenkov yesterday during the controlled access: the bottom PMTs were replaced with a quartz window Photonis PMT and a borosilicate window PMT with wavelength shifter. The PMTs have seen no beam yet (in C).</p>
<p>Hall C Daily RC meeting: 1:30 p.m. in the conference room located on the second floor of the counting house.</p>
<p>Remote participation via Blue Jeans:<br />
browser: <a href="https://bluejeans.com/543903672">https://bluejeans.com/543903672</a></p>
<p>Meeting ID: 543903672<br />
phone: (888) 240-2560 (US toll free)</p>
<p>list of international numbers: <a href="https://bluejeans.com/numbers">https://bluejeans.com/numbers</a></p>
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