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</style><article id="node-617456" 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/3544576" rel="bookmark">Follow-up Re: Torus/Solenoid/Buffer dewar cool down</a>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3544576" class="lognumber" data-lognumber="3544576">3544576</a>. Submitted by <a href="https://logbooks.jlab.org/user/kashy">kashy</a> on <time datetime="2018-03-14T15:04:42-0400" pubdate="pubdate">Wed, 03/14/2018 - 15:04</time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hblog">HBLOG</a> <a href="https://logbooks.jlab.org/book/clog">CLOG</a></td></tr><tr><th>Entry Makers: </th><td>kashy, dinsley, cwiggins</td></tr><tr><th>References: </th><td><a href="https://logbooks.jlab.org/entry/3544489">3544489 - Torus/Solenoid/Buffer dewar cool down</a></td></tr></table></div>
<div class="logentry node-content">
<p>Good progress on cooling the Hall B systems.<br />
We circulated all portions of the system after having no flow for 1 week.<br />
I minor bump on the contamination sensor at ESR was seen and it went from about 2ppm to 4ppm briefly after 20minutes but quickly cleaned back up.<br />
The sensor at CHL purifiers went up sooner for some reason to about 37ppm and cleaned up quicker.</p>
<p>Solenoid average temperature 50K, Torus 51K and buffer dewar flowing.<br />
We now have a fairly stable cooldown with the Solenoid cooling at 1.3K/hr and Torus at 4K per hour.</p>
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<div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:3032408da06d11ff16a5aa2adbacc579@logbooks.jlab.org" width="960" height="574" alt="" title="Stable operation achieved at 14:40" /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:4516c2b98765d851b583bc65af8390b2@logbooks.jlab.org" width="960" height="640" alt="" title="Torus Helium screen" /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:10cc6f56ccb90befc5e3ad2bdb3b1fde@logbooks.jlab.org" width="960" height="548" alt="" title="Solenoid Helium screen" /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:8ee41172224e2b5dec97fcbce475fa23@logbooks.jlab.org" width="960" height="601" alt="" title="Torus Coil temps" /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:87dc7498f07f6b3070becdf4dc878a7f@logbooks.jlab.org" width="960" height="469" alt="" title="Solenoid Coil temps (notice how C1 and 2 cool first and are closely coupled to the helium temp)" /></div> </div>
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