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</style><article id="node-556624" 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/3483774" rel="bookmark">Solenoid Cooldown - Cooling Basically Done</a>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3483774" class="lognumber" data-lognumber="3483774">3483774</a>. Submitted by <a href="https://logbooks.jlab.org/user/kashy">kashy</a> on <time datetime="2017-09-07T14:55:31-0400" pubdate="pubdate">Thu, 09/07/2017 - 14:55</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/clog">CLOG</a></td></tr><tr><th>References: </th><td><a href="https://logbooks.jlab.org/entry/3483741">3483741 - Follow-up Re: Solenoid Cooldown</a></td></tr></table></div>
<div class="logentry node-content">
<p>Congratulations to ALL, A major step has been completed today.<br />
The Solenoid is cold and we have Liquid Helium in both the lead reservoir and Magnet reservoir!<br />
I will continue to tune the control loops to improve stability.<br />
Lead flow controllers were replaced this morning and are working perfectly.</p>
<p>One major sticking point to powering the magnet is completion of the Hi-Pot test.<br />
At present we have a team looking at a low resistance to ground of the water cooled lead "A". </p>
<p>The superconducting liquid probes have been disconnected and are being investigated.<br />
Helium flow from ESR has reduced from ~10g/s to ~6g/s</p>
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<div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:e2d43a9920321b8ed5b4107df8565548@logbooks.jlab.org" width="960" height="555" alt="" title="SST showing LHe in Reservoirs and Lead Flow controllers at setpoint" /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:d33e9f33d3b2b13ff99d669cdba50a1b@logbooks.jlab.org" width="955" height="713" alt="" title="Coil Temperature Sensors all below 5K " /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:ee3babac89816355ffd8f3f42bc15538@logbooks.jlab.org" width="955" height="713" alt="" title="Helium Channel cooling plate temperatures" /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:594c51195e313aebf20e2ded6a5b529c@logbooks.jlab.org" width="955" height="713" alt="" title="Heat Shield Temperatures ( all below 80K will likely change as magnet stabilizes - could go up or down...)" /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:590cfb199930cbbd6cbc46e39dcd93c0@logbooks.jlab.org" width="910" height="628" alt="" title="Load Cells ( More investigation needed as some of the Z supports went way down.)" /></div> </div>
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