[Hallc_running] [New Logentry] Hall C RC Update (Sept 19)

brads at jlab.org brads at jlab.org
Sat Sep 19 14:45:02 EDT 2020

Logentry Text:
<ul><li>Generally pretty good beam during Swing and Owl</li><li>Making good progress on the 1-pass run plan (more details below).</li></ul><p> </p><p><strong>RC Daily Meetings at 4:15 PM</strong></p><p> </p><pre>To join the Meeting:  <a class="external free" href="https://bluejeans.com/861439920" rel="nofollow">https://bluejeans.com/861439920</a>
To join via phone :  +1.408.740.7256 (US (San Jose)), +1.888.240.2560 (US Toll Free))
</pre><p> </p><p><strong> Saturday 19 Sept 2020. </strong></p><p> </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><p> </p><ul><li>Beam energy measurement started at Fri 2:15pm <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851159" rel="nofollow">[1]</a>, completed around Fri 5:30pm (including restoring production optics)<ul><li>Results: 2182.708 +/- 2.3662 MeV <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851233" rel="nofollow">[2]</a>, <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851231" rel="nofollow">[3]</a></li></ul></li><li><strong>Fri 5:15pm--7:45pm</strong> Ion chamber calibrations on No Target, Carbon-Optics, and Ref Cell(135psig N2):* Will continue with <a title="D2n Run Plan 2020-1pass" href!
 ="https://hallcweb.jlab.org/wiki/index.php/D2n_Run_Plan_2020-1pass">1-pass runplan</a></li><li><strong>Fri 7:55pm</strong> Began 1-pass production</li><li><strong>Fri 11:30pm</strong> SHMS dipole tripped, not clear why.. Reset cleanly though <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851428" rel="nofollow">[4]</a><ul><li>Run plan delivered to shift crew: <a title="D2n Run Plan 2020" href="https://hallcweb.jlab.org/wiki/index.php/D2n_Run_Plan_2020#1-pass_Running">1-pass running</a> program</li><li>-Done- Beam Energy Measurement (1 hour)</li><li>-Done- Reference Cell Empty, Hydrogen (H2), Carbon Cross Sections (3--4 hours)</li><li>-Done- No Target Run</li><li>-Done- 3He Reference Cell Runs (N2 and 3He Pressure Curves, False Asymmetries) (5hrs ideal, 3 hrs min)</li><li>-Done- Reference Cell He3 Cross Sections (1 hour)</li><li>-- In Progress -- Polarized 3He Runs, 3He elastic and QE longitudinal Asymmetries (16 hours)<ul><li>~50% complete as of Sat, 2!
 pm</li><li>Should Flip Target polarization to Longitudinal/0 a!
 round Sat, 2pm</li><li>Another ~8 hours of production follows</li></ul></li><li>Polarized 3He Elastic Longitudinal Asymmetry (until end of 1-pass running)</li><li>NOTE: OPS/MCC would like to stop beam at Monday 7am for some Accel tests (TBD)</li></ul></li></ul><p> </p><ul><li>Some beam energy stability issues have been noticed by Hall B (in particular); Jay is looking into this<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 analysis for 1-pass.</li><li>Hall C beam energy drifted up after the Hall C beam energy measurement was taken <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851714" rel="nofollow">[5]</a></li><li>Hall B Moller Fri, 09/18/2020 - 10:20 was higher than expected: -86.233 +/- 1.494 (several pe!
 rcent) <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851060" rel="nofollow">[6]</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">[7]</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">[8]</a>. No notice to Halls, unfortunately..</li></ul></li></ul><p> </p><p> </p><p> </p><h2><span id="Notes_for_the_Future" class="mw-headline">Notes for the Future</span></h2><ul><li><a title="D2n Run Plan 2020" href="https://hallcweb.jlab.org/wiki/index.php/D2n_Run_Plan_2020#1-pass_Running">1-pass running</a> program</li><li><strong>MCC/OPs is requesting that beam delivery to Halls be halted at 7am instead of 8am to run a couple measurements (TBD)</strong><ul><li>Measurements are intended to guide future work on beam and e!
 nergy stability issues noted earlier.</li></ul></li><li>Hall will move !
 to Controlled Access on Monday<ul><li>When is still TBD; depends when RadCon is available</li><li>Could be in the afternoon</li><li>EPR photodiode will be replaced on Monday (JP, Junhao, RadCon)</li><li>Will move to Restricted Access ________ ?</li></ul></li></ul><p> </p><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><p> </p><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><p> </p><h2><span id="Pending_Issues" class="mw-headline">Pending Issues</span></h2><h2><span id="Opportunistic_Jobs!
 .2FAccess" class="mw-headline">Opportunistic Jobs/Access</span></h2><ul><li>See <a title="D2n Run Plan 2020" href="https://hallcweb.jlab.org/wiki/index.php/D2n_Run_Plan_2020#Target_Calibrations_and_Tests">D2n_Run_Plan_2020#Target_Calibrations_and_Tests</a></li></ul><p> </p><h1><span id="Current_Run_Plan" class="mw-headline">Current Run Plan</span></h1><h2><span id="Friday_SWING_.E2.86.92_Monday" class="mw-headline">Friday SWING → Monday</span></h2><ul><li>See task list at <a title="D2n Run Plan 2020" href="https://hallcweb.jlab.org/wiki/index.php/D2n_Run_Plan_2020#Run_Plan_for_1-pass">Run Plan for 1-pass</a>for more details<ul><li>Priority will be PbPt polarization cross check with longitudinal pol. elastics.</li><li>These have lower priority but will likely be pursued <strong>first</strong>while target spins up<ul><li>Beam energy measurement (1st thing)</li><li>3He, N2 density measurements</li><li>H2 xsec measurement</li><li>Pressure curves</li></ul></li></ul></li><!
 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>


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