[Hallc_running] [New Logentry] Hall C RC Update (Sept 18)

Fri Sep 18 15:45:01 EDT 2020

Logentry Text:
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<p><strong>Short summary:</strong></p><ul><li>Finished 5-pass running at 6am this morning, switched to 1-pass and Beam energy measurement underway.</li><li>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></ul><h1><span id="RC_Meeting_Information" class="mw-headline">RC Meeting Information</span></h1><p><strong>RC Daily Meetings are M-F 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>
To join via phone :  +1.408.740.7256 (US (San Jose)), +1.888.240.2560 (US Toll Free))
</pre><pre>** This page is IN PROGRESS **
</pre><p><strong> Friday 18 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>Lost RF at 11:00am on Thursday <a class="external autonumber" href="https://logbooks.jlab.org/entry/3850408" rel="nofollow">[1]</a>, down until 4pm<ul><li>Root cause was issue with the Master Oscillator (MO) that drives timing for all RF cavities and other Accelerator systems.. <a class="external autonumber" href="https://logbooks.jlab.org/entry/3850453" rel="nofollow">[2]</a></li></ul></li><li>Continued production data in Kin-C, Kin-Z with pol 3He target, <strong>Transverse/270</strong> when beam returned.</li><li><strong>10:30pm</strong> set <strong>HMS</strong>to Kin-A (HMS Kin-A : p0=-4.200, Theta=13.50) and continued production running there<ul><li>Fairly smooth beam overnig!
 ht</li></ul></li><li><strong>6am</strong>Began the transition to 1-pass<ul><li>RadCon enetered at 6am and we were in CA by 6:45</li><li>Reconfigured the Raster for 1-pass <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851033" rel="nofollow">[3]</a>, <a class="external autonumber" href="https://logbooks.jlab.org/entry/3850980" rel="nofollow">[4]</a>, <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851020" rel="nofollow">[5]</a></li><li>Reset the SHMS (and HMS) collimator controls and rehomed/reset both to correct collimators <a class="external autonumber" href="https://logbooks.jlab.org/entry/3850954" rel="nofollow">[6]</a><ul><li>Everything behaving normally after the controller reset.</li></ul></li><li>Opened He3 cylinder valves at target <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851063" rel="nofollow">[7]</a></li><li>Install collimator in target; buttoned up target</li><li>Change spectrometer angles !
 to SHMS: 8.5, HMS:11.7 and set momenta appropriately</li><li>H!
 all A setup the charge-asym feedback system for us (P. King, et al)</li></ul></li><li>Hall to Beam Permit at 10:30am; MCC started sending tune beam around 11:15<ul><li>Some issues with beam focus (too narrow in y), got things squared away by 1pm</li></ul></li><li>Laser interlock tripped around 1pm (coincidentally)<ul><li>Took access and found a panel had shifted (tape relaxing) <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851175" rel="nofollow">[8]</a>; Fixed and back to beam permit around 2pm.</li></ul></li><li>Initial target polarization after target work ~25% <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851074" rel="nofollow">[9]</a><ul><li>Updated NMR calibration constant estimate: 7.39 <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851130" rel="nofollow">[10]</a>, <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851074" rel="nofollow">[11]</a>, <a class="external autonumber" h!
 ref="https://logbooks.jlab.org/entry/3851203" rel="nofollow">[12]</a></li></ul></li><li>Beam energy measurement started at 2:15pm <a class="external autonumber" href="https://logbooks.jlab.org/entry/3851159" rel="nofollow">[13]</a></li><li>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></ul><h2><span id="Notes_for_the_Future" class="mw-headline">Notes for the Future</span></h2><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 will need to be followed by Shift Crew -- We will have to run the 'flipper script'</li><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>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 replac!
 ed on Monday (JP, Junhao, RadCon)</li><li>Will move to Restricted Access ________ ?</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></ul></li></ul>

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