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</style><article id="node-681664" 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/3608771" rel="bookmark">RC daily update</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/3608771/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3608771/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/3608771" class="lognumber" data-lognumber="3608771">3608771</a>. Submitted by <a href="https://logbooks.jlab.org/user/sjjooste">sjjooste</a> on <time datetime="2018-10-13T13:56:57-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1539449817&end_date=1539457017&book=HCLOG">Sat, 10/13/2018 - 13:56</a></time>. </p>
<p class="last-update">
Last updated on <time datetime="2018-10-13T13:57:39-0400" pubdate="pubdate">Sat, 10/13/2018 - 13:57</time></p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hclog">HCLOG</a></td></tr></table></div>
<div class="logentry node-content">
<p>After 6 hours, the studies to improve the BLM trip rate was concluded after the start of swing,<br />
we had a very steady beam of 35uA (as requested) until 11pm. Then the beam was down for<br />
3 hours due to an issue with the cryo-modules. Around 2am, beam was restored and beam<br />
stayed very steady since. More info here: <a href="https://logbooks.jlab.org/entry/3608762">https://logbooks.jlab.org/entry/3608762</a><br />
This is definitely some of the most stable beam I have seen so far.</p>
<p>Around noon, we noticed that all the files in the hallc_replay directory had disappeared<br />
(<a href="https://logbooks.jlab.org/entry/3608730">https://logbooks.jlab.org/entry/3608730</a>). I contacted Eric and Brad, and Brad found<br />
out it was because someone accidentally executed an "rm -r *" in hallc_replay. Brad<br />
had a backup from 11pm yesterday and we still had the experiment CSV file open in<br />
an editor, so we were able to recover the full hallc_replay directory smoothly.</p>
<p>We took data at the Q2=3. W=3.14 x=0.25 theta_Shms=6.495 deg kinematic point<br />
and collected ~12% of the total statistics goal. The owl shift crew brought up the fact<br />
that the lambda missing mass distribution in the online reconstruction looks about<br />
twice as wide in this setting, meaning we might be underestimating the amount of<br />
lambda events collected by a factor of ~2.<br />
At 1pm, we changed to the Al dummy target and will stay here for 2 hours. We will<br />
then resume data taking on LH2, and move to the next kinematic point either during<br />
the end of the owl shift, or the beginning of the day shift tomorrow.</p>
<p>There will be an RC meeting today at 4:30 pm on the second floor of the counting house. </p>
<p>For a summary of the meeting:<br /><a href="https://hallcweb.jlab.org/wiki/index.php?title=RC_meeting_and_Run_Plan,_Saturday_Oct._13">https://hallcweb.jlab.org/wiki/index.php?title=RC_meeting_and_Run_Plan,_...</a></p>
<p>To join the Meeting:<br /><a href="https://bluejeans.com/861439920">https://bluejeans.com/861439920</a></p>
<p>To join via Room System:<br />
Video Conferencing System: bjn.vc -or-199.48.152.152<br />
Meeting ID : 861439920</p>
<p>To join via phone :<br />
1) Dial:<br />
+1.408.740.7256 (US (San Jose))<br />
+1.888.240.2560 (US Toll Free))<br />
+1.408.317.9253 (US (Primary, San Jose))<br />
(see all numbers - <a href="http://bluejeans.com/numbers">http://bluejeans.com/numbers</a>)</p>
<p>2) Enter Conference ID : 861439920</p>
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