[Hallc_running] [New Logentry] RC Update for Thursday, Feb 27

[brads at jlab.org]

Logentry Text:
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<p><a class="new" title="RC Meeting and Run Plan, Thursday, February 27th 2020" href="https://hallcweb.jlab.org/wiki/index.php?title=RC_Meeting_and_Run_Plan,_Thursday,_February_27th_2020">RC Meeting and Run Plan, Thursday, February 27th 2020</a></p><p> </p><p><strong>RC Daily Meetings are at 4:15 PM, 2nd floor Counting House Meeting Room </strong> <a class="external text" href="https://bluejeans.com/861439920" rel="nofollow">Bluejeans Connection</a></p><p><strong> Thursday 27th Feb. 2020. </strong></p><p> </p><h1><span id="General_updates" class="mw-headline">General updates</span></h1><ul><li>Extended down over OWL (~7 hours) due to issues in the NL<ul><li>Production running when we had beam<ul><li>Beam pretty trippy</li><li>Significant beam excursion on target (at 5-pass) traced to an orbit tweak in 1st pass line: <a class="external free" href="https://logbooks.jlab.org/entry/3792693" rel="nofollow">https://logbooks.jlab.org/entry/3792693</a></li></ul></li></ul><!
 /li><li>Moller measurement completed with some difficulties Thursday day shift <a class="external free" href="https://logbooks.jlab.org/entry/3793115" rel="nofollow">https://logbooks.jlab.org/entry/3793115</a></li><li>~90 min down planned for early Friday day shift to implement some software fixes at MCC<ul><li>Make escorted access to look at NMR hardware at that time? (JP, Junhao, et al?)</li><li>Swap USB-ethernet bridge with our spare (Arun, Junhao?)</li></ul></li></ul><p> </p><h2><span id="Notes_for_the_Future" class="mw-headline">Notes for the Future</span></h2><ul><li>Injector spot move tentatively planned for early next week (Mon/Tues)?<ul><li>2--3 hour down</li></ul></li><li>Photocathode reactivation likely deferred until week of March 16(?)<ul><li>Will depend on measured QE lifetime after spot move</li></ul></li><li>1 hour run with target out for measure of the background just from the beryllium windows (<em>Filler</em> for next spin-up)</li></ul><p> </p><!
 ul><li>Target coil rotation planned for March 13--20<ul><li>No!
 minal 1-week downtime in Hall C to rotate target coils, install new cell, and transition to d2n program</li><li>Lots of preplanning to be completed (RadCon, Techs, S&A, Target group, etc)</li><li>RW-II training for JP, Arun, Brad (Complete the training documentation and take the RW-II test if you haven't already done so)</li></ul></li></ul><p> </p><h2><span id="Pending_problems" class="mw-headline">Pending problems</span></h2><ul><li>Beam energy shifts between ARC1:p and INJ:p impacted beam polarization to A/C? (Started 2/18 through today): <a class="external free" href="https://logbooks.jlab.org/entry/3793295" rel="nofollow">https://logbooks.jlab.org/entry/3793295</a></li><li>3C20 BPM noise issue <a class="external free" href="https://logbooks.jlab.org/entry/3793274" rel="nofollow">https://logbooks.jlab.org/entry/3793274</a></li><li>Large coil current 'flatline' questions (<a class="external free" href="https://logbooks.jlab.org/entry/3792713" rel="nofollow">https!
 ://logbooks.jlab.org/entry/3792713</a>)<ul><li>Conclusion is that 'flatline' is OK, PS regulation is just better than the resolution of the meter (confirm?)</li></ul></li><li>Ongoing target correction coil readback/software issue (LabView) <a class="external free" href="https://logbooks.jlab.org/entry/3792556" rel="nofollow">https://logbooks.jlab.org/entry/3792556</a><ul><li>Opportunistic access to replace USB-ethernet bridge Friday morning?</li></ul></li><li>NMR issues<ul><li>Opportunistic access to investigate cabling/settings in the Hall Friday morning?</li></ul></li><li>Persistent BLM & ion chamber trips<ul><li>General activation, weird BLM issues (<a class="external free" href="https://logbooks.jlab.org/entry/3792326" rel="nofollow">https://logbooks.jlab.org/entry/3792326</a>), Ad-hoc ion chamber threshold adjustments (<a class="external free" href="https://logbooks.jlab.org/entry/3792095" rel="nofollow">https://logbooks.jlab.org/entry/3792095</a>)</li><li><strong>!
 NOTE</strong>: Shift crew should <em>NOT</em> give authorization to MCC!
  change ion chamber thresholds. If they ask, tell Operator to contact an appropriate expert. Make a log entry if trips persist, or call the RC if it becomes severe (for example, >20 trips/hour is getting intolerable)</li></ul></li></ul><p> </p><h2><span id="Fixed_problems" class="mw-headline">Fixed problems</span></h2><h2><span id="Opportunistic_Access_Jobs" class="mw-headline">Opportunistic Access Jobs</span></h2><ul><li>Target group would like to check NMR connections and hardware settings in the Hall (JP, Junhao)<ul><li>See <a class="external free" href="https://logbooks.jlab.org/entry/3792467" rel="nofollow">https://logbooks.jlab.org/entry/3792467</a> , <a class="external free" href="https://logbooks.jlab.org/entry/3792457" rel="nofollow">https://logbooks.jlab.org/entry/3792457</a></li></ul></li></ul><p> </p><h2><span id="Recent_polarization_measurements" class="mw-headline"><br></span></h2>

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