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</style><article id="node-556743" 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/3483893" rel="bookmark">Follow-up Re: Solenoid Sensor Calibration</a>
</h1>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3483893" class="lognumber" data-lognumber="3483893">3483893</a>. Submitted by <a href="https://logbooks.jlab.org/user/kashy">kashy</a> on <time datetime="2017-09-08T11:30:59-0400" pubdate="pubdate">Fri, 09/08/2017 - 11:30</time>. </p>
<p class="last-update">
Last updated on <time datetime="2017-09-08T11:34:22-0400" pubdate="pubdate">Fri, 09/08/2017 - 11:34</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/3483747">3483747 - Solenoid Sensor Calibration</a></td></tr></table></div>
<div class="logentry node-content">
<p>Helium level probes had a wiring issue. Scot Spiegel reverse engineered the probes based on resistance measurments and made the wires match. They work now.</p>
<p>The Helium DP sensor was oscillating ~1%. This was fixed by installing a damper in the VCO fittings. This fixed both LL8670DP and PT8670 which was also oscillating. The damper was installed on the exit of both valves from the SST VJ. We have made a drawing for this part. (we also put some in on the Torus during its commissioning).</p>
<p>Note: The magnet heat load seems pretty low. There is very little ice on the vaporizer. The total flow to Hall B went up from ~4g/s to ~6g/s now that the solenoid load is on a the same time. Both the cooldown and the liquid transfer valve to the Magnet Reservoir are closed. Thus most of this load seems to be a refrigeration load.</p>
<p>Heaters 8620 and 8672 for the liquid reservoirs are not working, these are being worked by Pablo and Brian.</p>
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<div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:b81732469bf6befe27161e633fdba5c4@logbooks.jlab.org" width="960" height="615" alt="" title="SC Helium Level probes now working (also note that both EV8612 and EV8611JT are both closed) " /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:f1657a273c5f28bef6842e88af459a51@logbooks.jlab.org" width="960" height="468" alt="" title="Pressure and LL oscillations fixed" /></div> <div class="image-wrapper"><img view_mode="elog_email" class="image-style-plentybig" src="cid:bdad2635e321f1b24e43f2cb65336f4b@logbooks.jlab.org" width="946" height="491" alt="" title="Total 4K flow to Hall B before, during and after 4K CD of Solenoid" /></div> </div>
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