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</style><article id="node-1113585" 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/4040550" rel="bookmark">RC Daily summary - Monday</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/4040550/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/4040550/delete?destination=email/send">Delete</a></li></ul></div>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/4040550" class="lognumber" data-lognumber="4040550">4040550</a>. Submitted by <a href="https://logbooks.jlab.org/user/daria">daria</a> on <time datetime="2022-09-12T13:13:36-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1662999216&end_date=1663006416&book=HBLOG">Mon, 09/12/2022 - 13:13</a></time>. </p>
<p class="last-update">
Last updated on <time datetime="2022-09-12T13:16:29-0400" pubdate="pubdate">Mon, 09/12/2022 - 13:16</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 RG-C enthusiasts,</p>
<p>It's all beginning to unravel a little. </p>
<p>Yesterday's update took us to the target anneal (30 min in liquid argon), followed by polarisation with the microwaves at the newly-found "optimal" frequency. Finding it is a finicky process and the frequency had to be adjusted several times as the polarisation (and later dose) increased. When NMR was reading -12% (at 3.40 pm), we sent 7 nA on the target and concurrently started checking and adjusting the raster. </p>
<p>There was an, ahem, glitch with the raster controls when I accidentally put an embarrassingly large number in the x-offset window -- the x-raster shut down but was brought back immediately by Eugene. </p>
<p>Optimised raster, although it looks like it could still use a nudge up in y, we will try this at the start of the next run: <a href="https://logbooks.jlab.org/entry/4040334">https://logbooks.jlab.org/entry/4040334</a></p>
<p>Continued taking data and watching and tweaking the microwave frequency during the evening and the night (thank you, Victoria, for the middle-of-night target rescues!).<br />
At 4pm it got to -13.4%. At 5.20 pm, -19%. Run 16945 was the process of polarisation increasing and raster optimisation.</p>
<p>Just as things seemed to be going well for us, MCC started having trouble. Lost beam for ~30min for their optimisation around 7.45pm, then again at midnight for 5h30 when a breaker died in the accelerator. The polarisation levelled out as it was no longer being irradiated: <a href="https://logbooks.jlab.org/entry/4040461">https://logbooks.jlab.org/entry/4040461</a></p>
<p>Since the beam returned just before dawn, we have been taking production data with negative target polarisation, half-wave plate still OUT. Polarisation increasing, currently above 29% (negative).</p>
<p>Mohammad keeps cooking and Harut, Raffaella and Noemie have been studying the polarisation off-line in the meantime. The method of forming an asymmetry on-line from helicity-latched triggers looked hopeful but is still inconclusive. </p>
<p>My (and Larry's) RC sreports at today's Hall B meeting: <a href="https://clasweb.jlab.org/group_meeting_minutes/Physics/talks_2022/rc-report-09122022.pdf">https://clasweb.jlab.org/group_meeting_minutes/Physics/talks_2022/rc-rep...</a></p>
<p>Let's have the RC meeting at 2pm today as usual!</p>
<p>Daria,<br />
Your (today) slightly frazzled 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 an earlier RC summary.</p>
<p>TOTAL triggers from "good" runs: 467 M (peak pol. about 37% according to NMR).</p>
<p>---------<br />
Half-wave plate IN, target polarisation POSITIVE:</p>
<p>16910 - 16922: details in an earlier 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 - 16832: details in the previous RC summary.</p>
<p>TOTAL triggers from "good" runs: 638 M. (peak NMR pol. about -31%)</p>
<p>---------<br />
Half-wave plate OUT, target polarisation NEGATIVE:</p>
<p>16933 - 16944: details in the previous RC summary.</p>
<p>TOTAL triggers from "good" runs: 335 M. (pol. dropping during this stage).</p>
<p> ---------<br />
Target ANNEALED, Half-wave plate still OUT, target polarisation again NEGATIVE:</p>
<p>16945: 78.4 M (raster optimisation, pol. increasing from 12% to 19% -- not for production).<br />
16946: 26.6 M<br />
16947: 67.3 M (DAQ crashed at end).<br />
16948: 17.8 M<br />
16951: 100.2 M (NMR reading about -28% at the end, polarisation still increasing).<br />
16952: running... currently 94M.</p>
<p>TOTAL triggers from "good" runs so far, with NMR pol. reading > 20% (and steadily increasing): 306 M.</p>
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