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</style><article id="node-609958" 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/3537081" rel="bookmark">Status update</a>
</h1>
</header><div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3537081" class="lognumber" data-lognumber="3537081">3537081</a>. Submitted by <a href="https://logbooks.jlab.org/user/mack">mack</a> on <time datetime="2018-02-23T10:09:58-0500" pubdate="pubdate">Fri, 02/23/2018 - 10:09</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>Sign up for shifts! </p>
<p>While the MPS bcm in Hall C was tuned, an opportunistic RF recovery took place. When beam came back, there was a higher current attempt, then a return to lower currents to finish a solid target kinematic setting. Then we got knocked offline due to a radiation monitor trip in the truck ramp. The offending equipment has been replaced. Data taking resumed with currents as high as 60muA. A so-called "high current test" is harder and more ambiguous than it sounds. With a baseline of ~8 trips/hour, an hour of beam at a given current can only tell you at high confidence if the trip rate got much better ( 2.3 or below), or got much worse (increased to 13.7 or above). We can chase our tails basing decisions on 1sigma fluctuations. Earlier in the evening, I saw no believable correlation between current and trip rate. But later it appeared that the trip rate was unacceptably high at higher currents, so owl shift ran at 40-45 muA depending on the target. The PD's plan is to adiabatically push for higher currents today while experts are available, then coast thru the weekend. </p>
<p> There was several items of major to minor concern in the last day: Q2 ramped itself down with no interlock flags, but magnet whisperer JP Chen got it running again (<a href="https://logbooks.jlab.org/entry/3536638">https://logbooks.jlab.org/entry/3536638</a> ); replay indicated an HMS DC ringing alarm, suggesting that this issue occasionally pops up even at the present 5.5V threshold ( <a href="https://logbooks.jlab.org/entry/3536358">https://logbooks.jlab.org/entry/3536358</a> ); and a pedestal shifted out of spec in an HMS calorimeter channel ( <a href="https://logbooks.jlab.org/entry/3536965">https://logbooks.jlab.org/entry/3536965</a> ). </p>
<p>Special notices in effect for shift crews:<br />
Don't go higher than 610A with HMS Q2 <a href="https://logbooks.jlab.org/entry/3535714">https://logbooks.jlab.org/entry/3535714</a><br />
Instructions for LH2 <--> LD2 switches by TO : <a href="https://logbooks.jlab.org/entry/3534487">https://logbooks.jlab.org/entry/3534487</a><br />
Maximum current for Gaskell's bor-on-ing targets is 40 muA: <a href="https://logbooks.jlab.org/entry/3535297">https://logbooks.jlab.org/entry/3535297</a><br />
Any missing reference time messages should not be ignored: <a href="https://logbooks.jlab.org/entry/3535289">https://logbooks.jlab.org/entry/3535289</a></p>
<p>Fixes:<br />
Good event definition tweak for hodo effi determination: <a href="https://logbooks.jlab.org/entry/3536418">https://logbooks.jlab.org/entry/3536418</a> and <a href="https://logbooks.jlab.org/entry/3536031">https://logbooks.jlab.org/entry/3536031</a><br />
Fix of cryomodule vacuum improves coolant overhead (or something) <a href="https://logbooks.jlab.org/entry/3536612">https://logbooks.jlab.org/entry/3536612</a><br />
MPS bcm was tuned better but the jury's still out on the result: <a href="https://logbooks.jlab.org/entry/3536478">https://logbooks.jlab.org/entry/3536478</a> , and <a href="https://logbooks.jlab.org/entry/3536445">https://logbooks.jlab.org/entry/3536445</a> , and <a href="https://logbooks.jlab.org/entry/3536550">https://logbooks.jlab.org/entry/3536550</a></p>
<p>Recent calibration/analysis updates:<br />
Deepak's hms dc calibration: <a href="https://logbooks.jlab.org/entry/3536825">https://logbooks.jlab.org/entry/3536825</a><br />
Debitwa got recalibrated: <a href="https://hallcweb.jlab.org/doc-private/ShowDocument?docid=958">https://hallcweb.jlab.org/doc-private/ShowDocument?docid=958</a> </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 />
+1.888.240.2560 (US Toll Free)<br />
+1.408.317.9253 (Alternate number)<br />
(Global Numbers)<br />
2) Enter Meeting ID: 543 903 672<br />
3) Press #</p>
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