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</style><article id="node-920101" 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/3847119" rel="bookmark">Hall C RC Update (Sept 13)</a>
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Lognumber <a href="https://logbooks.jlab.org/entry/3847119" class="lognumber" data-lognumber="3847119">3847119</a>. Submitted by <a href="https://logbooks.jlab.org/user/brads">brads</a> on <time datetime="2020-09-13T12:28:07-0400" pubdate="pubdate"><a href="https://logbooks.jlab.org/entries?start_date=1600010887&end_date=1600018087&book=HCLOG">Sun, 09/13/2020 - 12:28</a></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>Tags: </th><td><a href="https://logbooks.jlab.org/tag/shiftsummary">ShiftSummary</a></td></tr></table></div>
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<p><a class="new" title="RC Update and Run plan for Sep 13,2020" href="https://hallcweb.jlab.org/wiki/index.php?title=RC_Update_and_Run_plan_for_Sep_13,2020">RC Update and Run plan for Sep 13,2020</a></p><p><strong> NOTE: 1-pass running has been set to begin early on Friday, Sept 18</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>Taken ~12 hours of data in last 24; Accelerator struggling with a series of hardware problems</li><li>Down from 1am last night until (still down..) for series of issues with the chopper in the Injector <a class="external autonumber" href="https://logbooks.jlab.org/entry/3847003" rel="nofollow">[1]</a> and south linac <a class="external autonumber" href="https://logbooks.jlab.org/entry/3847055" rel="nofollow">[2]</a>. Problem with 1L17 that took us down yesterday doesn't look fixed either <a class="external autonumber" href="https://logbooks.jlab.org/entry/3846934" rel="nofollow">[3]</a>.<ul><li>Opportunistic access Sunday morning to reset spectrometer rotation (tripped on Friday around the same time as the HMS dipole)</li></ul></li><li>Set spectrometers to Kin-A, Kin-X Sunday morning and will continue with 90-deg running when beam returns</li><li>Max Target Tommy polarization @ 90 since Sept 10 was reached this morning (after being down for a shift) at 38.8% <a class="external autonumber" href="https://logbooks.jlab.org/entry/3847087" rel="nofollow">[4]</a></li></ul><ul><li>Junhao reports the spectrum analyzer parts are ready to go for Monday<ul><li>RadCon has been looped in and will support</li></ul></li><li>Target should be rotated to 270 deg on Monday</li></ul><div><h2><span id="Notes_for_the_Future" class="mw-headline">Notes for the Future</span></h2><ul><li>Bill, Murchhana check compass/field measurements and will report back at Sun RC meeting</li></ul><ul><li>Beam Studies planned for <strong>Monday</strong> @ 10am to ~9pm with some opportunity for 5-pass running mid-day</li><li><strong>10am</strong>: Hall C will enter <em>Controlled Access</em>as planned<ul><li>Target work (2 tasks currently planned; RadCon support needed)<ul><li>Replace a spectrum analyzer mounting plate</li><li>Take a compass measurement of the field at the carbon foil ladder position if possible [TBD]</li><li>Rotate target to <strong>Transverse/270</strong></li></ul></li><li>SOLID cherenkov config change (in parallel)</li></ul></li><li>Lock-up Hall when done and take data (Ref cell, Optics?) until 2nd part of beam studies begin</li><li><strong>4:15pm - 9:15pm</strong>: Beam studies, part 2<ul><li>Requires beam to Hall C dump, but no production running will be practical (as I understand it)</li></ul></li><li><strong>9:15<em>: Continue production running in Kin-A, Kin-X at </em><em>transverse/270'</em> </strong>when beam returns</li></ul><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> scheduled for Friday, Sept 18</li></ul></div><h2><span id="Pending_Issues" class="mw-headline">Pending Issues</span></h2><ul><li>Check EPR calibrations (particularly for 270deg setting, but others too) [Melanie]</li><li>Check field direction measurements (Compass and field probe) [Murchhana, Bill]</li><li>Magnet EPICS PV timeout issue; perhaps reboot skylla10 on Monday?<ul><li>Some Magnets Channels Lost Connection Briefly <a class="external autonumber" href="https://logbooks.jlab.org/entry/3846677" rel="nofollow">[9]</a> (Saturday, 2pm)</li><li>Also had to add more error checking to the angle reporting in the CODA run-start GUI last week too (same softIOC as above)</li><li>'Heartbeat' issue reported by Steve Lassiter last week</li></ul></li><li>Target polarization for Tommy @ 270 is low (mid to high 30s); Tommy @ 90 seems to have plateaued at 38%<ul><li>Spectrum analyzer collimator was broken at some point and present optics setup may be allowing transient light to interfere with spectrum measurement and QWP scans</li><li>JP wonders if the field direction is off for the transverse settings (Bill, Murchhana: see note in Target group chat from late Thursday)</li></ul></li></ul><ul><li>Beam energy drifts<ul><li>Just something to keep an eye on. Has not been a problem lately.</li><li>Hall C 5-pass polarization goes down as energy (HALLC:p) goes up <a class="external autonumber" href="https://logbooks.jlab.org/entry/3844493" rel="nofollow">[10]</a></li></ul></li></ul><h2><span id="Opportunistic_Jobs.2FAccess" class="mw-headline">Opportunistic Jobs/Access</span></h2><ul><li>Beam Studies planned for <strong>Monday</strong>, Sept 14</li><li>Misc Target calibrations / tests<ul><li>Just before Moller measurement, and/or other known downtimes</li><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></li></ul><h1><span id="Current_Run_Plan" class="mw-headline">Current Run Plan</span></h1><h2><span id="Sunday_DAY_.E2.86.92_Monday_OWL" class="mw-headline">Sunday DAY → Monday OWL</span></h2><ul><li><strong>Monday at 8am</strong>Move spectrometers to Kin-A, Kin-X and continue Transverse/90 running there<ul><li>Update correction coil settings for Kin-X HB field [Done]</li></ul></li><li>Continue production data in Kin-A, Kin-X with pol 3He target, <strong>Transverse/90</strong> polarization with pNMR/NMR every 5 hrs.</li></ul><h2><span id="Monday_DAY" class="mw-headline">Monday DAY</span></h2><ul><li><strong>10am</strong>: Hall C will enter <em>Controlled Access</em>as planned<ul><li>Target work (2 tasks currently planned; RadCon support needed)<ul><li>Replace a spectrum analyzer mounting plate</li><li>Take a compass measurement of the field at the carbon foil ladder position if possible [TBD]</li><li>Rotate target to <strong>Transverse/270</strong></li></ul></li><li>SOLID cherenkov config change (in parallel)</li></ul></li><li>Lock-up Hall when done and take data (Ref cell, Optics?) until 2nd part of beam studies begin</li><li><strong>4:15pm - 9:15pm</strong>: Beam studies, part 2<ul><li>Requires beam to Hall C dump, but no production running will be practical (as I understand it)</li></ul></li><li><strong>9:15<em>: Continue production running in Kin-A, Kin-X at </em></strong><em>transverse/270'</em> when beam returns</li></ul><h2><span id="Monday_SWING_.E2.86.92_Tuesday_OWL" class="mw-headline">Monday SWING → Tuesday OWL</span></h2><ul><li>Continue production data in Kin-A, Kin-X with pol 3He target, <strong>Transverse/270</strong> polarization with pNMR/NMR every 5 hrs.</li></ul><h2><span id="Tuesday_DAY_.E2.86.92_Tuesday_SWING" class="mw-headline">Tuesday DAY → Tuesday SWING</span></h2><ul><li>Continue production data in Kin-A, Kin-X with pol 3He target, <strong>Transverse/270</strong> polarization with pNMR/NMR every 5 hrs.</li></ul><hr /><pre><br /><strong>-- General plan is fixed below this point, but fine details are still tentative -- </strong></pre><h2><span id="Wednesday_OWL_.E2.86.92_Wednesday_SWING" class="mw-headline">Wednesday OWL → Wednesday SWING</span></h2><ul><li>Moller measurement on Wednesday DAY<ul><li>This will also be used to infer polarization at 1-pass (if it fails, we'll try again on Thursday DAY)</li></ul></li><li><strong>Wednesday OWL or DAY during Moller</strong> Move spectrometers to Kin-C, Kin-Z and continue Transverse/270 running there</li><li>Continue production data in Kin-C, Kin-Z with pol 3He target, <strong>Transverse/270</strong> polarization with pNMR/NMR every 5 hrs when Moller complete.</li></ul><h2><span id="Wednesday_OWL_.E2.86.92_Wednesday_SWING_2" class="mw-headline">Wednesday OWL → Wednesday SWING</span></h2><ul><li>Continue production data in Kin-C, Kin-Z with pol 3He target, <strong>Transverse/270</strong> polarization with pNMR/NMR every 5 hrs.</li></ul><h2><span id="Thursday_OWL_.E2.86.92_Friday_OWL" class="mw-headline">Thursday OWL → Friday OWL</span></h2><ul><li>Continue production data in Kin-C, Kin-Z with pol 3He target, <strong>Transverse/270</strong> polarization with pNMR/NMR every 5 hrs.</li><li><strong>6 am</strong> Move to Controlled Access (w/ RadCon support) to begin transition to 1-pass</li></ul><h2><span id="Friday_DAY" class="mw-headline">Friday DAY</span></h2><ul><li>(Started at 6am) Open target enclosure<ul><li>Install collimators (JP, RadCon)</li><li>Check on EPR photo-diode status, likely replace it? (JP, RadCon)</li></ul></li><li>Ensure fast raster is reconfigured correctly (Expert: Jones, Gunning)</li><li>Rotate to minimum angles for HMS (11.7) and SHMS (8.5) (S. Lassiter, A. Comer)</li><li>Configure target for Longitudinal/0 or Longitudinal/180 (TBD)</li></ul><ul><li>Close up and wait for MCC to establish (1-pass) beam to the Hall</li></ul><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>Initial priority will be PbPt polarization cross check with longitudinal pol. elastics.</li><li>These have lower priority but will likely be pursued while target spins up<ul><li>3He, N2 density measurements</li><li>H2 xsec measurement</li><li>Pressure curves</li></ul></li></ul></li></ul></div>
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