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<div class="moz-cite-prefix">Excellent system!<br>
Volker<br>
<br>
On 2/8/17 9:20 AM, <a class="moz-txt-link-abbreviated" href="mailto:kashy@jlab.org">kashy@jlab.org</a> wrote:<br>
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<article id="node-529629" class="node node-logentry article
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<h1 class="node-title"> <a moz-do-not-send="true"
href="https://logbooks.jlab.org/entry/3456790"
rel="bookmark">ESR trip last night at Torus ops and
status</a> </h1>
</header>
<div class="date-vitals">
<p class="author-datetime"> Lognumber <a
moz-do-not-send="true"
href="https://logbooks.jlab.org/entry/3456790"
class="lognumber" data-lognumber="3456790">3456790</a>.
Submitted by <a moz-do-not-send="true"
href="https://logbooks.jlab.org/user/kashy">kashy</a>
on <time datetime="2017-02-08T09:16:27-0500"
pubdate="pubdate">Wed, 02/08/2017 - 09:16</time>. </p>
<p class="last-update"> Last updated on <time
datetime="2017-02-08T09:17:38-0500" pubdate="pubdate">Wed,
02/08/2017 - 09:17</time></p>
<table class="field-vitals">
<tbody>
<tr>
<th>Logbooks: </th>
<td><a moz-do-not-send="true"
href="https://logbooks.jlab.org/book/hblog">HBLOG</a>
<a moz-do-not-send="true"
href="https://logbooks.jlab.org/book/hbtorus">HBTORUS</a>
<a moz-do-not-send="true"
href="https://logbooks.jlab.org/book/clog">CLOG</a></td>
</tr>
<tr>
<th>Entry Makers: </th>
<td>kashy</td>
</tr>
</tbody>
</table>
</div>
<div class="logentry node-content">
<p>Last night at ~8:30pm, the ESR cold box tripped and
stopped sending 4K helium to All Halls. The Torus was
running steadily at 65%helium level at the time. The
flow started to return around 9:20pm. The refrigerator
was fully recovered by 10:00pm. The helium level dropped
to 28%, and the temperature of the VCL buss at the
bottom warmed a few K. The major alarm was that the
inlet pressure to the Torus dropped to 1.4 atm. This
would have appropriately caused a controlled rampdown of
the magnet. The coils and splices stayed cold. </p>
<p>After the ESR was brought back on line the system
recovered and before midnight the Torus was full and
stable.</p>
<p>** No intervention from Hall B staff was required**</p>
<p>This was one of the things that was nice to learn by
keeping the Torus at 4K after the KPP</p>
<p>Also just now we had a pressure dip on PT8111 to below
the alarm value for running of 2.3 so I set the alarm
value to 1.9atm.</p>
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