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</style><article id="node-1120880" 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/4047845" rel="bookmark">RC summary for September 28</a>
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</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/4047845/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/4047845/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/4047845" class="lognumber" data-lognumber="4047845">4047845</a>. Submitted by <a href="https://logbooks.jlab.org/user/hovanes">hovanes</a> on <time datetime="2022-09-28T10:00:36-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1664370036&end_date=1664377236&book=HBLOG">Wed, 09/28/2022 - 10:00</a></time>. </p>
<p class="last-update">
Last updated on <time datetime="2022-09-28T10:19:11-0400" pubdate="pubdate">Wed, 09/28/2022 - 10:19</time></p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hblog">HBLOG</a></td></tr></table></div>
<div class="logentry node-content">
<p>During last 24 hours we were able to take some production data. Accelerator spent a significant amount of time fixing problems though, so when we got beam at 3am the trip rate looked noticeable better than before. We started day shift taking data with positive NH3 and HWP OUT. The beam was pretty choppy. At around noon with reduced the beam current to 6nA. We had to go to Controlled Access to swap a discriminator board for CND at around 5pm which accidentally coincided with the time when beam was taken away again. Dan and Jose swapped the problematic discriminator and the bad pattern in the CND TDC monitoring histograms was gone. There seem to be two bad TDC channels there. Also Silvia found that there is a missing ADC channel based on the monitoring histograms. These channels need further investigations. We get the beam back at 3am during owl shift and started taking production data until 9:30am when the target polarization switch started. </p>
<p>Day shift summary : <a href="https://logbooks.jlab.org/entry/4047249">https://logbooks.jlab.org/entry/4047249</a><br />
Swing shift summary : <a href="https://logbooks.jlab.org/entry/4047542">https://logbooks.jlab.org/entry/4047542</a><br />
Owl shift summary : <a href="https://logbooks.jlab.org/entry/4047668">https://logbooks.jlab.org/entry/4047668</a> </p>
<p>We roughly took 150M events between the day shift and the target polarization switch. The PROD66_PIN run just before the polarization switch is run 17093 . </p>
<p>Plans: </p>
<p>Take data with HWP OUT and negative polarization. Switch HWP to IN sometime late this evening to balance HWP IN and OUT with this target polarization.<br />
Controlled Access during Thursday maintenance that starts on day shift. Do the "TE measurements" for the NH3 target. Change target material to unpolarized CH2.<br />
Try to fix the CND missing channels. Work on vacuum pumps by Denny.<br />
Bleed-through test when beam comes back.<br />
Take data with CH2 target Thursday evening. </p>
<p>Today's RC meeting is at 2:15pm . </p>
<p> Zulkaida will be the next RC. </p>
<p>Hovanes.</p>
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