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</style><article id="node-917452" 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/3844471" rel="bookmark">RC Daily Update</a>
</h1>
</header><div class="contextual-links-wrapper"><ul class="contextual-links"><li><a href="https://logbooks.jlab.org/entry/3844471/edit?destination=email/send">Edit</a></li><li><a href="https://logbooks.jlab.org/entry/3844471/delete?destination=email/send">Delete</a></li></ul></div>
<div class="date-vitals">
<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3844471" class="lognumber" data-lognumber="3844471">3844471</a>. Submitted by <a href="https://logbooks.jlab.org/user/cyero">cyero</a> on <time datetime="2020-09-09T09:27:08-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1599654428&end_date=1599661628&book=HCLOG">Wed, 09/09/2020 - 09:27</a></time>. </p>
<p class="last-update">
Last updated on <time datetime="2020-09-09T12:34:27-0400" pubdate="pubdate">Wed, 09/09/2020 - 12:34</time></p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hclog">HCLOG</a></td></tr><tr><th>Entry Makers: </th><td>cyero</td></tr></table></div>
<div class="logentry node-content">
<b>Accelerator Status:</b>
<ul><li>Sep 08/09 Swing/Owl (yesterday, today):
<ul><li>Accelerator beam studies (~16:30 - 19:30)</li>
<li>Beam restoration to Hall C ~20:50 (took ~1 hr longer than expected)</li>
<li>2L23-5 Solenoid Fault Downtime (1:03 - 3:20) <a href="https://logbooks.jlab.org/entry/3844293">2L23-5_Downtime</a> </li>
</ul></li>
<li>Sep 09 Day (today):
<ul><li>MCC 7:45 meeting updates:
<ul><li> Ops will do "Beam Studies" next Tuesday Day Shift (Sep 15).</li>
<li> In response to the Halls B/C/D beam energy (HALLC:p for us) dropping by a few MeV (~3 MeV for C) and because of the impact on beam polarization the Halls B/C/D (drop by few percent), it was
decided to go back to the Injector (INJ) configuration as of 02:00 Sep 08 Owl (yesterday). <del>This work will be done this morning at the INJ (~10:00 - 11:00) for which beam to all Halls is expected to be down
during said time.</del> See PD (Jay) detailed log-entry: <a href="https://logbooks.jlab.org/entry/3843977">HALLC:p</a>. As of 10:05, the INJ work has been cancelled. See
lon-entry: <a href="https://logbooks.jlab.org/entry/3844503">INJ_work_cancelled</a></li>
</ul></li>
</ul></li>
</ul><b>General Hall C Updates:</b>
<ul><li> Sep 08/09 Swing/Owl (yesterday, today):
<ul><li>NOTE: Yesterday, B. Sawatzky noticed abnormaly high rates when beam to Hall C was OFF (during d2n temperature tests) while beam to Hall A was ON. This lead to the
suspicion of bleed-through beam from A to C <a href="https://logbooks.jlab.org/entry/3844073">HallA_bleedthrough</a>. Will have to watch for this during future target work that requires no beam in Hall.
Follow-up entry by William (Bill) Henry shows exactly when suspected bleed-through started (~15:36, yesterday) <a href="https://logbooks.jlab.org/entry/3844179">bleedthrough_rates</a> </li>
<li> Junhao Chen did d2n temperature tests (~15:30 - 16:30) with Target: "Pickup Coil" inserted. The results are posted at: <a href="https://logbooks.jlab.org/entry/3844089">d2n_temp_test</a></li>
<li> At ~16:24, field was rotated from +90 to +270 deg. <a href="https://logbooks.jlab.org/entry/3844064">270_deg_rotation</a> </li>
<li> At ~16:36, NMR mesurement was done at +270 deg and target polarization was determined to be 33.5 %. <a href="https://logbooks.jlab.org/entry/3844050">270_deg_targetNMR</a> </li>
<li> Beam was restored at ~20:50 and beam profile checks were done. <a href="https://logbooks.jlab.org/entry/3844138">IHA3H07A</a>, <a href="https://logbooks.jlab.org/entry/3844142">IHA3H07B</a> </li>
<li> At ~21:43, NMR measurement of Pol He3 (+270 deg) was determined to be 36.7 % polarization (still too low). <a href="https://logbooks.jlab.org/entry/3844164">NMR_meas</a> <br />
It was decided to change to reference cell target (scraping checks: <a href="https://logbooks.jlab.org/entry/3844195">ref_cell_scraping_test</a>) and take reference cell (N2, 135 psig)
to allow for polarization to increase closer to ~40 %.</li>
<li>At ~05:17, NMR measureement reported 37.6 % polarization. It was decided to start (05:20) d2n Pol He3 (+270 deg) production at HMS Kin-C and SHMS Kin-Z at IHWP = OUT configuration.</li>
<li> Beam Current History during Sep 08/09 Swing/Owl: <a href="https://logbooks.jlab.org/entry/3844281">Sep08_Swing</a>, <a href="https://logbooks.jlab.org/entry/3844442">Sep09_Owl</a> </li>
</ul></li>
<li> Sep 09 Day (today):
<ul><li>Continue d2n Pol He3 (+270 deg) production at HMS Kin-C and SHMS Kin-Z at IHWP = OUT configuration. </li>
<li>Beam is expected to be down for INJ work this morning at (~ 10:00 - 11:00).</li>
</ul></li>
</ul><b>Recent NMR/pNMR Measurements:</b><br />
Sep 08 (Day/Swing):
<ul><li> NMR (+90 deg): 09:24 | 40.7 % <a href="https://logbooks.jlab.org/entry/3843811">https://logbooks.jlab.org/entry/3843811</a></li>
<li> NMR (+90 deg): 15:40 | 39.0 % <a href="https://logbooks.jlab.org/entry/3844047">https://logbooks.jlab.org/entry/3844047</a></li>
<li> pNMR (+90 deg): 15:39 | 40.5 % <a href="https://logbooks.jlab.org/entry/3844047">https://logbooks.jlab.org/entry/3844047</a></li>
<li> NMR (+270 deg): 16:36 | 33.5 % <a href="https://logbooks.jlab.org/entry/3844050">https://logbooks.jlab.org/entry/3844050</a></li>
<li> NMR (+270 deg): 21:43 | 36.7 % <a href="https://logbooks.jlab.org/entry/3844164">https://logbooks.jlab.org/entry/3844164</a></li>
</ul>
Sep 09 (Owl):
<ul><li> NMR (+270 deg): 02:21 | 37.7 % <a href="https://logbooks.jlab.org/entry/3844308">https://logbooks.jlab.org/entry/3844308</a></li>
<li> pNMR (+270 deg):02:21 | 31.0 % <a href="https://logbooks.jlab.org/entry/3844308">https://logbooks.jlab.org/entry/3844308</a></li>
<li> NMR (+270 deg): 05:17 | 37.6 % <a href="https://logbooks.jlab.org/entry/3844366">https://logbooks.jlab.org/entry/3844366</a></li>
</ul><b>Recent IHWP Changes:</b><br /><ul><li>Sep 03 (Swing, as of 19:58) | IHWP = IN </li>
<li>Sep 04 (Owl, as of 04:00) | IHWP = OUT <a href="https://logbooks.jlab.org/entry/3840776">https://logbooks.jlab.org/entry/3840776</a> </li>
<li>Sep 04 (Day, as of 12:01) | IHWP = IN <a href="https://logbooks.jlab.org/entry/3841011">https://logbooks.jlab.org/entry/3841011</a> </li>
<li>Sep 05 (Day, as of 14:55) | IHWP = OUT <a href="https://logbooks.jlab.org/entry/3841696">https://logbooks.jlab.org/entry/3841696</a> </li>
<li>Sep 06 (Owl, as of 07:00) | IHWP = IN <a href="https://logbooks.jlab.org/entry/3842175">https://logbooks.jlab.org/entry/3842175</a> </li>
<li>Sep 06 (Swing, as of 22:04) | IHWP = OUT <a href="https://logbooks.jlab.org/entry/3842667">https://logbooks.jlab.org/entry/3842667</a> </li>
<li>Sep 07 (Day, as of 12:11) | IHWP = IN <a href="https://logbooks.jlab.org/entry/3843209">https://logbooks.jlab.org/entry/3843209</a> </li>
<li>Sep 08 (Owl, as of 05:05) | IHWP = OUT <a href="https://logbooks.jlab.org/entry/3843688">https://logbooks.jlab.org/entry/3843688</a> </li>
</ul><p>
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