[Hallc_running] [New Logentry] RC Daily Update
cyero at jlab.org
cyero at jlab.org
Wed Sep 9 09:30:04 EDT 2020
Logentry Text:
--
<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). 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. See PD (Jay) detailed log-entry: <a href="https://logbooks.jlab.org/entry/3843977">HALLC:p</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>
<li>Sep 08 (Day/Swing):</li>
<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>
<li>Sep 09 (Owl):</li>
<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>
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