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</style><article id="node-1117910" 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/4044875" rel="bookmark">RC Summary September 21</a>
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</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/4044875/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/4044875/delete?destination=email/send">Delete</a></li></ul></div>
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Lognumber <a href="https://logbooks.jlab.org/entry/4044875" class="lognumber" data-lognumber="4044875">4044875</a>. Submitted by <a href="https://logbooks.jlab.org/user/hauenst">hauenst</a> on <time datetime="2022-09-21T10:03:19-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1663765399&end_date=1663772599&book=HBLOG">Wed, 09/21/2022 - 10:03</a></time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hblog">HBLOG</a></td></tr><tr><th>Entry Makers: </th><td>hauenst</td></tr></table></div>
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<p>Welcome to the RC summary september 21</p><p>Yesterday was a long day of RF maintenance which we used to change target to ND3 and did some maintenance in the hall:</p><ul><li>Check of FTOF PMT (<a href="https://logbooks.jlab.org/entry/4044419">https://logbooks.jlab.org/entry/4044419</a>)</li><li>Check of DRCB firmware (<a href="https://logbooks.jlab.org/entry/4044497">https://logbooks.jlab.org/entry/4044497</a>), Problem wasn't fixed and made the decision to revert back to the firmware (v1.5) which was used for the last years and the beginiing of RGC (excluding the last week on NH3 on firmware v1.6) <a href="https://logbooks.jlab.org/entry/4044548">https://logbooks.jlab.org/entry/4044548</a></li></ul><p>First beam came back around 9:30pm. Initial harp scans looked good (<a href="https://logbooks.jlab.org/entry/4044628, https://logbooks.jlab.org/entry/4044633">https://logbooks.jlab.org/entry/4044628, https://logbooks.jlab.org/entr...</a>). We started Moller setup but run into trouble with a factor 2 difference between BCM readings on 2C24 and 2C21. Backed out of Moller to let MCC clean Orbits. Then there was a 1.5 downtime because of an ARC4 trip.</p><p>Around midnight, we got beam back with cleaned Orbits and did another harp scan ( <a href="https://logbooks.jlab.org/entry/4044686">https://logbooks.jlab.org/entry/4044686</a>). This time BCM readings were closer together for Moller run. Moller run concluded with -84+/-1.2% polarization but rather high charge asymmetry 0.445 - <a href="https://logbooks.jlab.org/entry/4044709">https://logbooks.jlab.org/entry/4044709</a>. We probably need to redo the Moller for this week with 1/2 plate OUT. It might be also correlated with HallC coming up to 80uAs. We will do a bleedthrough test in the next hour after the current run concludes.</p><p>In the meantime target was polarized and hold steady at around 44%.</p><p>Around 2:30am, we start going to the FC and everything was fine. We switched on detectors and started a run with PROD66_PIN with 8nA beam. Raster plots and DC occupancies looked good (<a href="https://logbooks.jlab.org/entry/4044740, https://logbooks.jlab.org/entry/4044750">https://logbooks.jlab.org/entry/4044740, https://logbooks.jlab.org/entr...</a>).</p><p>So far we collected about 100 M triggered events.</p><p>Plans:</p><ul><li>Bleedthrough test</li><li>Production with OUT and 8nA</li><li>Handing over phone to Hovanes :)</li></ul><p>We will have the RC meeting at 2:30pm today due to the MCC meeting (<a href="https://jlab-org.zoomgov.com/j/1608674253?pwd=SFZyYmZLWXJieGtpV2dEdVRiUEJnUT09&from=addon">https://jlab-org.zoomgov.com/j/1608674253?pwd=SFZyYmZLWXJieGtpV2dEdVRiUE...</a>)</p><p>Best,</p><p>Florian</p><p> </p><p> </p> </div>
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