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</style><article id="node-1113270" class="node node-logentry contextual-links-region article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/4040235" rel="bookmark">RC Daily Summary - Sunday</a>
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Lognumber <a href="https://logbooks.jlab.org/entry/4040235" class="lognumber" data-lognumber="4040235">4040235</a>. Submitted by <a href="https://logbooks.jlab.org/user/daria">daria</a> on <time datetime="2022-09-11T15:55:18-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1662922518&end_date=1662929718&book=HBLOG">Sun, 09/11/2022 - 15:55</a></time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hblog">HBLOG</a></td></tr><tr><th>Entry Makers: </th><td>daria</td></tr></table></div>
<div class="logentry node-content">
<p>Dear all, </p>
<p>A slightly more eventful past 24h.</p>
<p>Some DAQ problems during the day yesterday and a proper tantrum this morning -- needed a full ROC reboot by Sergey to fix. </p>
<p>Yesterday evening the NMR started showing a slight decrease in polarisation amplitude. I tried to adjust but the manual step motor control did not want to be touched -- frequency went wild for a while, finally managed to calm it down to 140.49 GHz, a notch up from previous 140.48 GHz. Seems optimum for the target condition (just a bit above 30%, negative pol), but NMR still shows a gradually falling polarisation. Decided to run overnight with this. <a href="https://logbooks.jlab.org/entry/4039990">https://logbooks.jlab.org/entry/4039990</a> <a href="https://logbooks.jlab.org/entry/4040022">https://logbooks.jlab.org/entry/4040022</a></p>
<p>Harut has been analysing the data hot-off-the-press, that Mohammed's been cooking (thank you both!), and observed a significant drop in the polarisation. It was decided this morning to anneal the target. Maxwell, Victoria, Tsuneo, Pushpa did the anneal at 1pm today, successfully completed -- the target is now polarising. We will start with negative polarisation.</p>
<p>Just before 9pm last night the RICH Sector 1 hardware interlocks packed in: <a href="https://logbooks.jlab.org/entry/4040015">https://logbooks.jlab.org/entry/4040015</a><br />
Valery tried to restart them remotely but total communication failure. Emailed Detector Support Group, but 'twas a tad late on a Saturday night to expect an immediate response. Valery came in and did a rapid-access power-cycle on the crate downstairs in the hall (thank you muchly!): that fixed the problem. RICH no longer at risk of catching fire. <a href="https://logbooks.jlab.org/entry/4040028">https://logbooks.jlab.org/entry/4040028</a><br />
This morning a RICH glitch (but was fixed with the RICH recovery procedure).</p>
<p>MCC took about 30min to bring the beam back after the Controlled Access (magnets ramping up) -- weird, just now it took 3min.</p>
<p>We flipped the half-wave plate to OUT at 10.30pm last night. </p>
<p>During the night there were a few beam-down incidents (lost about an hour) and a few trips, also some drifting beam positions which the shifters caught.</p>
<p>Nathan added a correction for the Faraday Cup beam-charge asymmetry to the helicity asymmetry: <a href="https://logbooks.jlab.org/entry/4039987">https://logbooks.jlab.org/entry/4039987</a><br />
There are changes in the asymmetries reflecting the HW-plate changes and the target pol reversal, but the results are still looking a bit odd. We're trying to make sense of them.</p>
<p>See you at the RC meeting on Monday at 2pm! </p>
<p>Have a good rest of Sunday, </p>
<p>Daria,<br />
Your RC</p>
<p>******** Stats since the start of ND3 with ELMO ********<br />
--------<br />
Half-wave plate OUT, target polarisation POSITIVE:</p>
<p>16902 - 16908: details in the previous RC summary.</p>
<p>TOTAL triggers from "good" runs: 467 M</p>
<p>---------<br />
Half-wave plate IN, target polarisation POSITIVE:</p>
<p>16910 - 16922: details in the previous RC summary.</p>
<p>TOTAL triggers from "good" runs: 498 M (slightly lower target pol than the set with OUT half-wave plate).</p>
<p>---------<br />
Half-wave plate IN, target polarisation NEGATIVE:</p>
<p>16923: 105.3 M (target pol increasing during this run).<br />
16924: 100.0 M (pinned)<br />
16925: 44.0 M (Brief RICH glitch, DAQ crash at the end)<br />
16927: 100.0 M<br />
16928: 100.0 M<br />
16929: 27.8 M (pinned, DAQ crash at end)<br />
16931: 81.6 M (40min of no beam at end, about an hour of fiddling with target pol in middle)<br />
16832: 79.4 M </p>
<p>TOTAL triggers from "good" runs: 638 M</p>
<p>---------<br />
Half-wave plate OUT, target polarisation NEGATIVE:</p>
<p>16933: 103.9 M (pinned)<br />
16934: 100.0 M (beam position drifts towards end)<br />
16935: 100.4 M<br />
16944: 30.8 M</p>
<p>Stopped to anneal target -- polarisation clearly dropped significantly in the past day or so.</p>
<p>TOTAL triggers from "good" runs: 335 M</p>
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