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</style><article id="node-992267" 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/3919256" rel="bookmark">RC Update [10/6/21]</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/3919256/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3919256/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/3919256" class="lognumber" data-lognumber="3919256">3919256</a>. Submitted by <a href="https://logbooks.jlab.org/user/flay">flay</a> on <time datetime="2021-10-06T20:35:11-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1633563311&end_date=1633570511&book=HALOG">Wed, 10/06/2021 - 20:35</a></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 RC update from the RC meeting is here: <a href="https://sbs.jlab.org/cgi-bin/DocDB/public/ShowDocument?docid=122">https://sbs.jlab.org/cgi-bin/DocDB/public/ShowDocument?docid=122</a></p>
<p>Overview<br />
- Hall is in Restricted Access<br />
- Jessie and his team have cleaned up the hall<br />
- Jack and his team are powering and testing the magnets to full current on<br />
SBS and BB<br />
- The target group is working on condensing the target; they had software<br />
issues during the day, but as of about 5 pm those have been resolved.<br />
They will work on condensation, and expect to need a TO at roughly **12 noon Thu**.<br />
- Shift Leader shifts are **cancelled* through Thursday Day. We have TO shifters on call. </p>
<p>All teams are working hard in the final stretch; the magnets testing is the<br />
critical path to obtain the run certificate. Other notes from today's<br />
RC meeting are below: </p>
<p>Magnet Current Settings<br />
- SBS: 2100 A<br />
- BB: 750 A </p>
<p>Analyzer<br />
- Effectively ready for initial commissioning program<br />
- Progress in setting up automated shift worker analysis<br />
- Plans: Shift workers type gosbs and run a wrapper/shell script that takes 1--2 command line arguments<br />
run-no no-events => replay => bring up analysis GUIs and click through pages of GUI (successively)<br />
- Division of responsibilities: Shift crew vs experts<br />
- Need online GUI parameters (only GEMs have it so far).<br />
- Training session for shifters, RCs?<br />
- Coming in a few days (?)<br />
- How-To documentation for online analysis is being developed </p>
<p>DAQ<br />
- Running combined DAQ (GMn1 config) last night.<br />
- Yesterday: VETROC warnings for the GRINCH (F1TDC). Bad events? (CODA 3 unidentified event warning in replays<br />
seen by DF, Scott B, others)<br />
- Raster test (see beam below)<br />
- BB shower window reduced by factor of 2 (200 ns -> 100 ns)<br />
- DAQ running at 4 kHz (good!)<br />
- sbsvme29 event-by-event readout work ongoing<br />
- Are we turning on the GEM HV tonight (late) or not?<br />
- Coordinate with Jack since he's doing magnet tests<br />
- All-detector config runs tonight<br />
- Make a Pedestal CODA config </p>
<p>GEMs<br />
- Efficiency: Hypothesis is that it's the new gas mixture system, but not quite sure yet.<br />
Minor issues with *configuration* of the DAQ.<br />
- Seeing efficiencies that make sense 80--90%) with HV before 9/27. Thereafter down to 60% or so.<br />
- Switched from standalone mixed gas system to Hall system that mixes Ar and CO2.<br />
- Sean, Zeke, Holly set up pre-mixed gas on J0 earlier today (one of layers that had a huge decrease in eff).<br />
Data on this can verify if the Hall gas system is the problem.<br />
- UVa at lower HV => lower efficiency?<br />
- INFN showing significantly lower efficiencies; focus gas studies on INFN GEMs? However, gas is the same for<br />
the whole system...<br />
- Compare data from tonight against two nights ago which was a good benchmark.<br />
- Run at HV where we expect high efficiency should tell us something. </p>
<p>HCAL<br />
- Gains are pretty well matched at this point<br />
- Sebastian working on energy calibration code<br />
- EDTM work with Mark Jones; EDTM (HCAL) to EDTM pulser in BB Hodo crate; pulsing fine; coincidence test<br />
after this meeting<br />
- Working on documentation for the first few days (threshold scan + energy calibration)<br />
- Update DAC GUI<br />
- Just about ready for beam </p>
<p>BB CAL<br />
- Working on documentation (first few minutes, hours, etc). Thinking about next steps: setting thresholds, etc.<br />
- SH and PS are calibrated, plots look good </p>
<p>BB GRINCH<br />
- HV is right where we want it for beam; dialing down from nominal settings; originally matched by gain top to bottom<br />
- Multiplicities are single-electron hits with the pulser; trying to be safe for beam.<br />
- Trying to optimize voltages to get raw PMT counts to about 50% of triggers<br />
- VETROC scalers stopped working; using up too much CPU cycles?<br />
- FADC scalers added by the DAQ group<br />
- Documentation is being written; will be updated<br />
- Tying up last ends; online analysis plots being developed/passed to analysis group </p>
<p>Beam<br />
- Raster test last night (nominal 2x2). Found *our* signals are plugged in backwards<br />
on FADC (LHRS). Raster pattern looks reasonable<br />
- Need to push replay code to SBS-replay </p>
<p>Helicity Flip Rate and Reporting<br />
- Settled on **120 Hz prompt reporting**</p>
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