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</style><article id="node-990952" 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/3917941" rel="bookmark">RC Update [10/4/21]</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/3917941/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3917941/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/3917941" class="lognumber" data-lognumber="3917941">3917941</a>. Submitted by <a href="https://logbooks.jlab.org/user/flay">flay</a> on <time datetime="2021-10-04T21:15:18-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1633392918&end_date=1633400118&book=HALOG">Mon, 10/04/2021 - 21:15</a></time>. </p>
<p class="last-update">
Last updated on <time datetime="2021-10-04T21:30:17-0400" pubdate="pubdate">Mon, 10/04/2021 - 21:30</time></p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/halog">HALOG</a></td></tr><tr><th>Entry Makers: </th><td>flay</td></tr></table></div>
<div class="logentry node-content">
<p>The slides I presented at today's RC meeting are posted to the doc-db: <a href="https://sbs.jlab.org/cgi-bin/DocDB/private/ShowDocument?docid=119">https://sbs.jlab.org/cgi-bin/DocDB/private/ShowDocument?docid=119</a>. </p>
<p>We're in the final days before beam arrives on Wednesday, and there's a lot of activity going on in the hall and remotely in this final stretch. Details are below (with updates through about 6:30 pm): </p>
<p>BB survey:<br />
- Give Jessie a threshold for pointing: 20 mm pointing to the target</p>
<p>Analyzer<br />
- Good shape; efficiency plots on the GUI<br />
- Question of DAQ/raw data producing mixed endian-ness of data?<br />
Replay bug was fixed.<br />
- Last steps: automating software</p>
<p>DAQ<br />
- Iterative improvements, testing TI<br />
- Full DAQ config testing ongoing<br />
- Tested spot++ on standalone LHRS DAQ config (HALOG:3917863, plots in 3917832, 3917838, 3917850, 3917851, )</p>
<p>HCAL<br />
- Brian: <more> confused with what's happening with the 24 modules (long tails)<br />
Not in signal path, HV. Base, tube, module itself? Latest hypothesis:<br />
pulser shows gain is very high => problem in module? Light collection in<br />
WLS may be compromised. Sebastian and Scott are swapping tubes and bases<br />
to see if the problem moves with the tube/base or stays with the module.<br />
if it's with the module, can't fix it in-situ. Maybe re-glue light guide?<br />
If no improvement, we'll take data this way, and calibrate HV to compensate<br />
due to low light collection</p>
<p>Spectrometer Magnets<br />
- BigBite & Super BigBite: low-power testing over the weekend<br />
- BigBite: Leaky hoses swapped with new ones over the weekend and pressure tested (30 mins)<br />
- Leak found today; fixes ongoing. Pushes survey to Tuesday<br />
- Super BigBite: Installation of SBS corrector magnet<br />
- SBS corrector magnet braces installed<br />
- Full-field testing planned for Wednesday</p>
<p>GEMs/Tracking<br />
- Fixed J2 middle, running with HV since then, big accomplishment/effort<br />
J2 top remains as the problem. Need detailed plan for making that swap.<br />
- All other latency changes<br />
- Argon gas ran out (!) DF & Alexandre changed that out Sunday<br />
Working on alarms to monitor this better. We want this on the shift checklist<br />
Monitoring flow rates, and <not> pressure readbacks. Running Ar and C02,<br />
mixing on site, not pre-mixed.<br />
- Weekly GEM expert schedule. Advance notice (to RC) switch bottles<br />
- Is this mixing system the one to be used in the future? This won't sustain the<br />
SBS GEMs. Follow-up offline (DF, Kondo, Brad, Jack, others)braces & guards on cabling/LCW hoses</p>
<p>BB CAL<br />
- PS calib almost done<br />
- SH calib complete<br />
- Looking at calibration scripts to have ready for Wed (e.g., Trig Rate vs threshold)<br />
- Ready by Wednesday</p>
<p>Beam Line (monitors, vacuum, correctors,...)<br />
- BCM u_new flatline? Not unexpected (0 V signal => 0 Hz)<br />
- Dave Mack & Simona Malace re-configured fanout of Dx10 to Moller polarimeter setup</p>
<p>Target<br />
- Vacuum pumpdown of all three sections (target chamber + DP station + downstream beamline) underway<br />
- Plan to cool with He tomorrow if all goes well tonight<br />
- No need for a shifter until we condense H2/D2.<br />
- Need access to the hall for condensation on Wed Oct 6. Can be controlled access, but <uninterupted><br />
- Ion chamber installed </p>
<p>Radiation Monitoring<br />
- Ellen Becker is setting up NDX detectors that will be placed in the BB GEM electronics bunker and the SBS bunker; plan to finish tomorrow. </p>
<p>Shifts<br />
- Cancelled through Wed Owl. On pace for starting shifts for Wed day shift</p>
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