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</style><article id="node-607982" 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/3535105" rel="bookmark">Status update</a>
</h1>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3535105" class="lognumber" data-lognumber="3535105">3535105</a>. Submitted by <a href="https://logbooks.jlab.org/user/mack">mack</a> on <time datetime="2018-02-20T09:40:43-0500" pubdate="pubdate">Tue, 02/20/2018 - 09:40</time>. </p>
<p class="last-update">
Last updated on <time datetime="2018-02-20T09:44:32-0500" pubdate="pubdate">Tue, 02/20/2018 - 09:44</time></p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hclog">HCLOG</a></td></tr><tr><th>Entry Makers: </th><td>mack</td></tr></table></div>
<div class="logentry node-content">
<p>RF recovery coincided with work on HMS Q1 and Q2 power supplies. While down, an access was made to improve temperature control for bcm1,2 by replacing the solid state relay. With beam back, an HMS saturation test was completed. The inclusive physics program then restarted. Big niteshift! There was trip free beam at 50 muA for a while overnite. <a href="https://logbooks.jlab.org/entry/3534889">https://logbooks.jlab.org/entry/3534889</a> There were repeated problems with oscillation of HMS DCs. The HMS DC thresholds were raised to 5.5V (done by Jmenu) in the hope this will mitigate the problem while still providing a good tracking efficiency. Beam trips reportedly came back later. Why so soon after an RF recovery? Apparently there's an unexpected extra 100W or so of heat load in the linacs. They're looking for it. The PD is very interested in our maximum current, since Hall C's RF power load is the tail that wags the accelerator. I recommend staying at 50 muA, but we can discuss it at today's meeting. </p>
<p>Sign up for shifts this coming weekend, etc. Keep Eric P happy!</p>
<p>Special notices in effect for shift crews:<br />
Instructions for LH2 <--> LD2 switches by TO : <a href="https://logbooks.jlab.org/entry/3534487">https://logbooks.jlab.org/entry/3534487</a><br />
We are now operating HMS DC thresholds at 5.5V <a href="https://logbooks.jlab.org/entry/3534955">https://logbooks.jlab.org/entry/3534955</a></p>
<p>Repairs:<br />
Possibly flakey solid state relay for BCM1/Unser/BCM2 oven replaced: <a href="https://logbooks.jlab.org/entry/3534470">https://logbooks.jlab.org/entry/3534470</a><br />
cascade problems associated with the solid state relay replacement (Good Dave G catch. Never forget that even paranoids have enemies.): <a href="https://logbooks.jlab.org/entry/3534564">https://logbooks.jlab.org/entry/3534564</a><br />
HMS Q1, Q2 work: <a href="https://logbooks.jlab.org/entry/3535092">https://logbooks.jlab.org/entry/3535092</a> </p>
<p>Recent calibration/analysis updates:<br />
Q2 = 11.5 Data quality check: <a href="https://logbooks.jlab.org/entry/3534429">https://logbooks.jlab.org/entry/3534429</a><br />
Updated t-to-d maps for the SHMS : <a href="https://logbooks.jlab.org/entry/3534419">https://logbooks.jlab.org/entry/3534419</a> (begs question of what about the HMS during CT)</p>
<p>We will meet in 200C at 1:30 pm (second floor of the counting house).</p>
<p>Link: <a href="https://bluejeans.com/543903672">https://bluejeans.com/543903672</a><br />
Connecting directly from a room system?<br />
1) Dial: 199.48.152.152 or bjn.vc<br />
2) Enter Meeting ID: 543 903 672<br />
Just want to dial in on your phone?<br />
1) Direct-dial with my iPhone or<br />
+1.408.740.7256 (United States)<br />
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(Global Numbers)<br />
2) Enter Meeting ID: 543 903 672<br />
3) Press #</p>
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