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<article id="node-1524171" class="node node-logentry article ia-n clearfix" role="article">
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<h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/4451103" rel="bookmark">Hall B RC Summary 08/27/2025</a>
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<div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/4451103" class="lognumber" data-lognumber="4451103">4451103</a>. Submitted by <a href="https://logbooks.jlab.org/user/efuchey">efuchey</a> on <time datetime="2025-08-26T09:40:05-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1756212005&end_date=1756219205&book=HBLOG">Tue, 08/26/2025 - 09:40</a></time>. </p>
<p class="last-update">
Last updated on <time datetime="2025-08-27T09:59:54-0400" pubdate="pubdate">Wed, 08/27/2025 - 09:59</time> </p>
<table class="field-vitals">
<tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hblog">HBLOG</a></td></tr>
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<div class="logentry node-content">
<p>Continuing pass 1 plan, with 50nA on D2 until 10:30<br />
10:40-14:45: 100 uA on D2:<br />
14:50-20:35: 200nA on D2:<br />
Issues during 200nA data taking<br />
* Downstream halo counters alarm: <a href="https://logbooks.jlab.org/entry/4451237">https://logbooks.jlab.org/entry/4451237</a><br />
-> Eugene fixed it by raising thresholds;<br />
* DAQ issue, then livetime with 200nA and rgl_2GeV_v7.5.trg too low (30%)<br />
-> Valery fixed it.<br />
* Accelerator scheduled (and unscheduled) downs (see below)</p>
<p>20:40-22:35 Target change from D2 to 4He. Sync-ed quite well with 2L20-2 issue (see below), only 30min of BANU necessary.</p>
<p>Production on 4He, 100 nA 8/26, 22:50 - 8/27, 2:35<br />
Production on 4He, 200 nA 2:35 - 5:15<br />
Issues during 4He production:<br />
00:15 Trig bit issues, Sergey indicated that adcft3 needed to be rebooted (15 min down): <a href="https://logbooks.jlab.org/entry/4451530">https://logbooks.jlab.org/entry/4451530</a><br />
5:10 (yes, 5 min before beam is taken away): AHDC HV drop, wouldn't come back with OFF/ON </p>
<p>Accelerator time-offs/issues:<br />
13:15 scheduled /one hour/ beam down to set Hall D back online at 15:30 (Yours truly had been informed immediately and adjusted the run plan)<br />
(and of course we had purged the target before we knew... to be fair it is due every 12-ish hours on D2)<br />
15:30 schedule beam off for... 2 hours 30 minutes! - (Yours truly should have know better...)<br />
After which issues with 2L07-4 <a href="https://ace.jlab.org/dtm/incidents/16279">https://ace.jlab.org/dtm/incidents/16279</a> (15 min down)<br />
<a href="https://ace.jlab.org/dtm/incidents/16283">https://ace.jlab.org/dtm/incidents/16283</a><br />
20:35 2L20-2 RFCM watchdog fault (1:50 down) <a href="https://ace.jlab.org/dtm/incidents/16281">https://ace.jlab.org/dtm/incidents/16281</a><br />
3:35 1L14 HV drop <a href="https://ace.jlab.org/dtm/incidents/16283">https://ace.jlab.org/dtm/incidents/16283</a> (12 min down)<br />
5:15 beam taken away for maintenance</p>
<p>Summary of Pass 1 data so far:<br />
Time/charge for 50nA, 4He: 430 min ABU / 1.29 mC<br />
Time/charge for 50nA, D2: 472 min ABU / 1.42 mC<br />
Time/charge for 100 nA, D2: 211 min ABU / 1.266 mC<br />
Time/charge for 200 nA, D2: 60 min ABU / 0.72 mC<br />
Time/charge for 100 nA, 4He: 195 min ABU / 1.17 mC<br />
Time/charge for 200 nA, 4He: 130 min ABU / 1.56 mC</p>
<p>Plan for tonight is to take calibration data on hydrogen (and not Helium-2 of course...)</p>
<p>News from MCC:<br />
Long maintenance day today: <a href="https://logbooks.jlab.org/entry/4451693">https://logbooks.jlab.org/entry/4451693</a><br />
Beam will most likely not be back before late swing.</p>
<p>RC meeting 11:30, in person at CH 200 or on zoom at <a href="https://jlab-org.zoomgov.com/j/1605705819">https://jlab-org.zoomgov.com/j/1605705819</a></p>
<p>Shift summaries:<br />
DAY: <a href="https://logbooks.jlab.org/entry/4451056">https://logbooks.jlab.org/entry/4451056</a><br />
SWING: <a href="https://logbooks.jlab.org/entry/4451286">https://logbooks.jlab.org/entry/4451286</a><br />
OWL: <a href="https://logbooks.jlab.org/entry/4451512">https://logbooks.jlab.org/entry/4451512</a></p>
<p>BTA from 8/26 8am to 8/27 8am:<br />
ABU: 748<br />
BANU: 121<br />
BNA+OFF: 571<br />
Logs:<br />
DAY: <a href="https://logbooks.jlab.org/entry/4451283">https://logbooks.jlab.org/entry/4451283</a><br />
SWING: <a href="https://logbooks.jlab.org/entry/">https://logbooks.jlab.org/entry/</a><br />
OWL: <a href="https://logbooks.jlab.org/entry/">https://logbooks.jlab.org/entry/</a></p>
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