[Hallc_running] [New Logentry] Hall C RC Update (Sept 20)

Sun Sep 20 15:40:05 EDT 2020

Logentry Text:
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<p> </p><p><strong>RC Daily Meetings are at 4:15 PM</strong></p><pre>To join the Meeting:  <a class="external free" href="https://bluejeans.com/861439920" rel="nofollow">https://bluejeans.com/861439920</a>
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</pre><pre>** This page is in progress. **
</pre><p><strong> Sunday 20 Sept 2020. </strong></p><h1><span id="General_updates" class="mw-headline">General updates</span></h1><p>(See <a title="D2n Run Plan 2020" href="https://hallcweb.jlab.org/wiki/index.php/D2n_Run_Plan_2020">d2n Run Plan 2020</a> for broader status/overview.)</p><ul><li><dl><dt><strong> d2n program completed around 9:30am</strong> (ran about 1 shift longer than initially planned)</dt></dl><ul><li>After looking at the He3 elastics data, it was decided to run 8 hour longer with some more aggressive paddle settings to improve statistics <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851938" rel="nofollow">[1]</a></li><li>E:QE ratio improved <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851946" rel="nofollow">[2]</a>; we'll have to work out the final numbers offline.</li><li>Target polarization continues to improve (good!), NMR calibration constant is likely overly optimistic, needs updating (but we'll stick!
  with it for now to maintain consistent relative numbers)</li></ul></li><li>Had an issue with s1y05+(B) signals were missing after paddles turned back on in the morning<ul><li>HV readbacks seemed to be good, thought this might be a issue with CAEN firmware, or in the DAQ/software chain. No problems found with signals when I got in to check -- puzzling.</li><li>Simona reports this is a known issue (tube needs to 'warm up' or something) and should call her. Strange symptom... <a class="external autonumber" href="https://logbooks.jlab.org/entry/3592165" rel="nofollow">[3]</a></li></ul></li></ul><ul><li><strong>Polarized 3He Elastic Longitudinal Asymmetry Study begins (E12-06-121A)</strong><ul><li><strong>9:00am</strong> Rotated HMS to 17deg, and checked analysis cuts and paddle settings</li><li><strong>9:50am</strong> Rotated SHMS to 13deg, no opportunity to check settings yet; beam went off</li></ul></li><li><strong>9:45am</strong> Beam off for MCC/Cryo to investigate 1L20 tu!
 rbo cube issue (insulating vacuum) <a class="external autonumb!
 er" href="https://logbooks.jlab.org/entry/3852110" rel="nofollow">[4]</a>, and trim card problem <a class="external autonumber" href="https://logbooks.jlab.org/entry/3852170" rel="nofollow">[5]</a><ul><li>1L20 Turbo Repaired/Reset by 10:30am</li><li>MQA8A20 trim card issue identified later in this down</li></ul></li><li><strong>11:30</strong> Beam back --- Production for E12-06-121A continues</li></ul><ul><li>Beam will shut off at 7am, Monday morning for 1 hour of Beam Study tests to address energy stability issues</li></ul><p> </p><h2><span id="Notes_for_the_Future" class="mw-headline">Notes for the Future</span></h2><ul><li>Hall will move to Restricted Access on Monday<ul><li>Expectation is 11am--noon; depends when RadCon is available</li><li>EPR photodiode will be replaced on Monday afternoon (JP, Junhao, RadCon)</li></ul></li></ul><ul><li>Bill, Murchhana check compass/field measurements<ul><li>Also checking with Jixie re: modeled fields</li><li>Need to make a write!
 -up that clearly defines all the different coordinate systems used, swapped power supply/polarity issues, etc.</li></ul></li></ul><ul><li>Start prepping for post-run work<ul><li>See <a title="D2n Run Plan 2020" href="https://hallcweb.jlab.org/wiki/index.php/D2n_Run_Plan_2020#POST-run_Calibrations.2FMeasurements">POST-run Calibrations/Measurements</a> for list</li><li>HCList being prepared for submission on Sunday</li></ul></li></ul><h2><span id="Pending_Issues" class="mw-headline">Pending Issues</span></h2><ul><li>Some beam energy stability issues have been noticed by Hall B (in particular); Jay is looking into this (Not immediate problem, just leaving this here as notes for future)<ul><li>These should not impact Hall C significantly, but may feed into beam polarization corrections.</li><li>Jay has link some of this discussion to the Hall C beam energy measurement HCLog entry and cross posted to the HCLog. This will help us follow breadcrumbs during beam polarization analys!
 is for 1-pass.</li><li>Hall C beam energy drifted up after the Hall C b!
 eam energy measurement was taken <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851714" rel="nofollow">[6]</a></li><li>Hall B Moller Fri, 09/18/2020 - 10:20 was higher than expected: -86.233 +/- 1.494 (several percent) <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851060" rel="nofollow">[7]</a></li><li>Energy shift that would impact Hall B polarization at few percent level <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851645" rel="nofollow">[8]</a></li><li>Energy lock switched from 2A to 3C Sat (19th) @ 9:40 <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851715" rel="nofollow">[9]</a>. No notice to Halls, unfortunately..</li></ul></li></ul><h1><span id="Current_Run_Plan" class="mw-headline">Current Run Plan</span></h1><h2><span id="Saturday_DAY_.E2.86.92_Monday_OWL" class="mw-headline">Saturday DAY → Monday OWL</span></h2><ul><li>See <a title="D2n Run Plan 2020-1pass" href="https!
 ://hallcweb.jlab.org/wiki/index.php/D2n_Run_Plan_2020-1pass#Polarized_3He_Elastic_Longitudinal_Asymmetry_.28until_end_of_1-pass_running.29">Polarized 3He Elastic Longitudinal Asymmetry Run Plan</a> for details</li></ul><ul><li><strong>NOTE</strong>: Hall C is in control of the Charge Asymmetry feedback system until Monday<ul><li><a title="Charge Feedback Parity DAQ" href="https://hallcweb.jlab.org/wiki/index.php/Charge_Feedback_Parity_DAQ">Charge Feedback Parity DAQ</a> Instructions</li><li>We will have to run the <code> ./FlipPCvaluesHallC</code> script in the Parity DAQ VNC session after every IHWP change</li></ul></li></ul><h2><span id="Monday_DAY" class="mw-headline">Monday DAY</span></h2><ul><li>Everything is opening up, so RadCon is pretty busy and isn't sure how quickly they will get to Hall C.<ul><li>Best guess is they'll be able to open the Hall to Restricted around 11--noon and be able to support the EPR diode swap in the afternoon</li></ul></li></ul><ul><li><a ti!
 tle="D2n Run Plan 2020" href="https://hallcweb.jlab.org/wiki/index.php/!
 D2n_Run_Plan_2020#POST-run_Calibrations.2FMeasurements">POST-run Calibrations/Measurements</a> are expected to take roughly 2 weeks.</li></ul>

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