[Hallc_running] [New Logentry] RC Update Sunday 1 March

brads at jlab.org brads at jlab.org
Sun Mar 1 13:05:01 EST 2020

Logentry Text:
<h1><span class="mw-headline"><a title="RC Meeting and Run Plan, Sunday, March 1 2020" href="https://hallcweb.jlab.org/wiki/index.php/RC_Meeting_and_Run_Plan,_Sunday,_March_1_2020">RC Meeting and Run Plan, Sunday, March 1 2020</a></span></h1><h1><span id="General_updates" class="mw-headline">General updates</span></h1><ul><li>Beam has been (relatively) quite good the last 24 hours, trip rate has improved</li><li>Target has been running smoothly in longitudinal at around 53%</li></ul><h2><span id="Notes_for_the_Future" class="mw-headline">Notes for the Future</span></h2><ul><li>Beam studies to understand what is going on with the machine are planned for Tuesday DAY shift<ul><li>We will try to get in Tuesday morning (RC will talk to PD and RadCon -- may need to open target enclosure)</li><li>Details being worked out, but it'll be a full 7--8 hour beam studies shift</li><li>May need to get into the Target enclosure (RadCon support)</li><li>There are portions of the Beam Studies!
  program that would involve beam delivery into Hall C (no target), so limited opportunity for Access only</li><li>EPR and pNMR measurements/work are planned during this downtime</li></ul></li><li>Injector spot move has been pushed off for at least another week (2--3 hour down)<ul><li>Hope is to push it off to the Hall C down that starts March 13, and then just do a reactivation that would carry us through May 6<ul><li>Not sure how it will work out, but goal will be to minimized downs and maximize integrated current to Hall(s)</li></ul></li></ul></li></ul><ul><li>'Filler' runs for next spin up / target-down period:<ul><li>1 hour run with target out for measure of the background just from the beryllium windows</li></ul></li></ul><h2><span id="Pending_Issues" class="mw-headline">Pending Issues</span></h2><ul><li>Transverse NMR measurement that failed <a class="external autonumber" href="https://logbooks.jlab.org/entry/3794242" rel="nofollow">[1]</a></li><li>pNMR issues</li><li!
 >EPR problems <a class="external autonumber" href="https://log!
 books.jlab.org/entry/3793821" rel="nofollow">[2]</a><ul><li>Going forward for EPR, I'd try (1) checking the continuity of the cable leading from the RF amplifier to the EPR coil to see if it's stable, (2) measure the current going through the EPR coil, (3) cleaning the single D2 filter (it was very dirty) and confirming the APD gain is indeed set to maximum, measure the DC light output (currently a measly 3.6 mV), then trying another FM sweep. If that doesn't improve it, then (4) remove the D2 filter, measure the DC light output, perform another FM scan.</li></ul></li><li>Kepco power supply commissioning/installation (Todd, Bill)</li><li>Update Transverse NMR calibration coeff.</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="htt!
 ps://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><h2><span id="Opportunistic_Access_Jobs" class="mw-headline">Opportunistic Access Jobs</span></h2><ul><li>Target work during Beam Studies (see above)<ul><li>pNMR troubleshooting</li><li>EPR issues <a class="external autonumber" href="https://logbooks.jlab.org/entry/3793821" rel="nofollow">[3]</a></li><li>Transverse NMR?<a class="external autonumber" href="https://logbooks.jlab.org/entry/3794242" rel="nofollow">[4]</a></li></ul></li></ul><h2><span id="Target_coil_rotation_planned_for_March_13--20" class="mw-headline"><strong>Target coil rotation planned for M!
 arch 13--20</strong></span></h2><ul><li><ul><li>Nominal 1-week downtime!
  in Hall C to rotate target coils, install new cell, and transition to d2n program</li><li>Status Update for target cell <em>Austin</em>:<ul><li>Wall and window thicknesses done</li><li>Only 'Reduced set' of density measurements available now, will continue measurements this week (issues with laser at UVa?)</li><li>It would be best for it to arrive at JLab on March 10 (at the latest) to allow locals to mount cell in oven plate before they get involved with target work in Hall.</li></ul></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>


This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/3795188
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