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We have superconducting solenoid!<br>
<br>
Congratulations to our magnet team, great job!<br>
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-------- Forwarded Message --------
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Subject:
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<td>[Hallb-engineering] [New Logentry] Solenoid Cooldown -
Cooling Basically Done</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Date: </th>
<td>Thu, 7 Sep 2017 15:00:03 -0400 (EDT)</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">From: </th>
<td><a class="moz-txt-link-abbreviated" href="mailto:kashy@jlab.org">kashy@jlab.org</a></td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">To: </th>
<td><a class="moz-txt-link-abbreviated" href="mailto:rfair@jlab.org">rfair@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:ghoshal@jlab.org">ghoshal@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:gyoung@jlab.org">gyoung@jlab.org</a>,
<a class="moz-txt-link-abbreviated" href="mailto:josephm@jlab.org">josephm@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:rossi@jlab.org">rossi@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:ent@jlab.org">ent@jlab.org</a>,
<a class="moz-txt-link-abbreviated" href="mailto:hogan@jlab.org">hogan@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:mont@jlab.org">mont@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:lung@jlab.org">lung@jlab.org</a>,
<a class="moz-txt-link-abbreviated" href="mailto:stuart@jlab.org">stuart@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:lassiter@jlab.org">lassiter@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:fansler@jlab.org">fansler@jlab.org</a>,
<a class="moz-txt-link-abbreviated" href="mailto:gomez@jlab.org">gomez@jlab.org</a>, <a class="moz-txt-link-abbreviated" href="mailto:hallb-engineering@jlab.org">hallb-engineering@jlab.org</a></td>
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<article id="node-556624" class="node node-logentry article
ia-n clearfix" role="article">
<header class="node-header">
<h1 class="node-title"> <a moz-do-not-send="true"
href="https://logbooks.jlab.org/entry/3483774"
rel="bookmark">Solenoid Cooldown - Cooling Basically
Done</a> </h1>
</header>
<div class="date-vitals">
<p class="author-datetime"> Lognumber <a
moz-do-not-send="true"
href="https://logbooks.jlab.org/entry/3483774"
class="lognumber" data-lognumber="3483774">3483774</a>.
Submitted by <a moz-do-not-send="true"
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>
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<th>Logbooks: </th>
<td><a moz-do-not-send="true"
href="https://logbooks.jlab.org/book/hbsolenoid">HBSOLENOID</a>
<a moz-do-not-send="true"
href="https://logbooks.jlab.org/book/clog">CLOG</a></td>
</tr>
<tr>
<th>References: </th>
<td><a moz-do-not-send="true"
href="https://logbooks.jlab.org/entry/3483741">3483741
- Follow-up Re: Solenoid Cooldown</a></td>
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</tbody>
</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>
</div>
<div class="attachment-box">
<div class="image-wrapper"><img view_mode="elog_email"
class="image-style-plentybig"
src="cid:part7.8BCBEB35.AF705A86@jlab.org" alt=""
title="SST showing LHe in Reservoirs and Lead Flow
controllers at setpoint" height="555" width="960"></div>
<div class="image-wrapper"><img view_mode="elog_email"
class="image-style-plentybig"
src="cid:part8.C5213966.92E886B2@jlab.org" alt=""
title="Coil Temperature Sensors all below 5K "
height="713" width="955"></div>
<div class="image-wrapper"><img view_mode="elog_email"
class="image-style-plentybig"
src="cid:part9.FDBBC6DC.A8F17084@jlab.org" alt=""
title="Helium Channel cooling plate temperatures"
height="713" width="955"></div>
<div class="image-wrapper"><img view_mode="elog_email"
class="image-style-plentybig"
src="cid:part10.1B66134F.C422CA92@jlab.org" alt=""
title="Heat Shield Temperatures ( all below 80K will
likely change as magnet stabilizes - could go up or
down...)" height="713" width="955"></div>
<div class="image-wrapper"><img view_mode="elog_email"
class="image-style-plentybig"
src="cid:part11.04A1C065.40A14BAF@jlab.org" alt=""
title="Load Cells ( More investigation needed as some
of the Z supports went way down.)" height="628"
width="910"></div>
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