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</style><article id="node-654323" 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/3581434" rel="bookmark">Follow-up Re: Follow-up Re: Hall B Magnet and Dewar Cooldown</a>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3581434" class="lognumber" data-lognumber="3581434">3581434</a>. Submitted by <a href="https://logbooks.jlab.org/user/kashy">kashy</a> on <time datetime="2018-07-18T16:31:45-0400" pubdate="pubdate">Wed, 07/18/2018 - 16:31</time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hbsolenoid">HBSOLENOID</a> <a href="https://logbooks.jlab.org/book/hbtorus">HBTORUS</a> <a href="https://logbooks.jlab.org/book/clog">CLOG</a></td></tr><tr><th>Entry Makers: </th><td>kashy, cwiggins</td></tr><tr><th>References: </th><td><a href="https://logbooks.jlab.org/entry/3581361">3581361 - Follow-up Re: Hall B Magnet and Dewar Cooldown</a></td></tr></table></div>
<div class="logentry node-content">
<p>Hall B has gone from 87K to 4.5K on nearly everything except the Solenoid coils in 31hrs.<br />
We are almost ready to switch to cold return, this switch will be a bit harder than normal as large portions of the ESR Valve Box have no 4.5K return flow thus this change will upset the cold box more than ususal. Chris Perry and I have agreed to do this first thing tomorrow. After that switch the Solenoid coils will continue to cool but this rate can be quite slow to allow Hall C to begin their cooldown. </p>
<p>We expect that Cryo and Hall C can begin the Hall C cooldown tomorrow July 19 between 09:00 and 10:00</p>
<p>Notes:<br />
Torus started to fill at 11:15<br />
Solenoid started to fill at 14:10<br />
Buffer Dewar started to fill at 16:15</p>
<p>We are setting up for 6g/s over night to soak Hall B and be ready for cold return switchover.</p>
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<div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:e05d0c107c49f88123c5bb5c1e4864c9@logbooks.jlab.org" width="960" height="469" alt="" title="Heliujm levels in Hall B" /></div> </div>
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