[Hallc_running] [New Logentry] RC Report for Monday, March 2

Mon Mar 2 13:55:01 EST 2020

Logentry Text:
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<p><strong><a class="new" title="RC Meeting and Run Plan, Monday, March 2 2020" href="https://hallcweb.jlab.org/wiki/index.php?title=RC_Meeting_and_Run_Plan,_Monday,_March_2_2020">RC Meeting and Run Plan, Monday, March 2 2020</a></strong></p><p><strong>RC Daily Meetings are M-F 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> Monday 2 Mar 2020. </strong></p><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 was actually pretty great during OWL (~10/hour)</li><li>Target has been running smoothly in longitudinal at around 53%</li><li>OPs/Injector group concluded it was best to get the spot move out of the way this morning at 11am</li><li>Target rotated to transverse at 11am for 5 hours of running, then switch back to longitudinal<ul><li>We will run !
 roughly 5 hours/day of transverse and then take the balance on longitudinal for the time being.</li></ul></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 (beam loss, activation, etc) are planned for Tuesday DAY shift<ul><li>Details being worked out, but it'll be a full 7--8 hour beam studies shift</li><li>Target EPR and pNMR measurements/work are planned during this downtime (see Pending Issues)</li><li>RadCon will support a Controlled Access first thing on Tuesday morning<ul><li>They are aware target group may need to open the enclosure (TBD)</li></ul></li><li>There are portions of the Beam Studies program that would involve beam delivery into Hall C (no target), we've arranged for that to happen in the afternoon.</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 j!
 ust 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> -- <strong>Solved</strong> (Bad 'Tee' in CH)</li><li>pNMR issues</li><li>EPR problems <a class="external autonumber" href="https://logbooks.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="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><li>Beam Studies program will investigate some of these issues (most pressing is significant activation + beam loss in the arcs)</li></ul></li><li>Contact with Target readbacks through AnywhereUSB USB bridge still drop out on occasio!
 n<ul><li>Initial replacement of the USB bridge failed (did not seem to !
 help underlying issue, then bridge stopped working), replaced with original device</li></ul></li><li>OPs wished to reboot hung iochc10 <a class="external autonumber" href="https://logbooks.jlab.org/entry/3795636" rel="nofollow">[3]</a>, noted in December as well <a class="external autonumber" href="https://logbooks.jlab.org/entry/3745818" rel="nofollow">[4]</a><ul><li>This runs the Moller cryo controls and should not be rebooted without expert oversight (does not impact operations). D. Gaskell is looking into getting this addressed properly with OPs.</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">[5]</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 March 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)<ul><li>Had job walkthrough meeting this (Monday) morning with the above parties -- so far, so good</li><li>Must coordinate Tech support with the parasitic test installation plans</li></ul></li><li>RW-II training for JP, Arun, Brad (Complete the training documentation and take the RW-II test if you haven't al!
 ready done so)</li></ul></li></ul><h1><span id="Current_Run_Plan" class!
 ="mw-headline">Current Run Plan</span></h1><h2><span id="Monday_DAY_.E2.86.92_Tuesday_OWL" class="mw-headline">Monday DAY → Tuesday OWL</span></h2><ul><li>Beam spot move in injector starting at 11am (few hours down)</li><li>Complete the last ~5 hour <em>NMR run period</em>from OWL, then do this (Finished when spot move started)<ul><li>Take longitudinal NMR</li><li>Rotate target to 90deg Transverse (<strong>Target Expert only</strong>)</li><li>Take transverse NMR</li><li>Take 5 hours of production data (HMS/SHMS -3.5/-3.4 GeV) with 3He target in <strong>transverse</strong></li><li>Take transverse NMR</li><li>Rotate target to 180deg Longitudinal (<strong>Target Expert only</strong>)</li><li>Take longitudinal NMR</li></ul></li><li>Continue production data (HMS/SHMS -3.5/-3.4 GeV) with 3He target, <strong>longitudinal</strong> polarization with NMR every 5 hrs.</li></ul><h2><span id="Tuesday_DAY" class="mw-headline">Tuesday DAY</span></h2><ul><li>Down for beam studies for mos!
 t of DAY shift<ul><li>Hall C will be in Controlled Access starting 8:30am through noon (likely in Laser CANS mode) for part of it</li><li>Hall C will be locked up for beam studies plans for 2nd half of shift<ul><li><strong>NOTE: Move target to 'NO TARGET' position and be aware of MCC operations at all times when in Beam Permit!</strong></li></ul></li></ul></li></ul><h2><span id="Tuesday_SWING_.E2.86.92_Wed_DAY" class="mw-headline">Tuesday SWING → Wed DAY</span></h2><ul><li>Follow the <a class="external text" href="https://hallcweb.jlab.or/wiki/index.php/Beam_and_Raster_Checkout_for_A1n/d2n_(Short_Procedure)" rel="nofollow">Short beam recovery procedure</a><ul><li>Skip the YAG <em>unless</em> you are concerned about the harp scan data.</li></ul></li><li>Take production data (HMS/SHMS -3.5/-3.4 GeV) with 3He target, <strong>longitudinal</strong> polarization with NMR every 5 hrs.</li></ul><h2><span id="Wednesday_DAY_.E2.86.92_Thursday_OWL" class="mw-headline">Wednesday DAY !
 → Thursday OWL</span></h2><ul><li>Complete the last ~5 hour <em>NMR r!
 un period</em>from OWL, then do this (should happen before noon!)<ul><li>Take longitudinal NMR</li><li>Rotate target to 90deg Transverse (<strong>Target Expert only</strong>)</li><li>Take transverse NMR</li><li>Take 5 hours of production data (HMS/SHMS -3.5/-3.4 GeV) with 3He target in <strong>transverse</strong></li><li>Take transverse NMR</li><li>Rotate target to 180deg Longitudinal (<strong>Target Expert only</strong>)</li><li>Take longitudinal NMR</li></ul></li><li>Continue production data (HMS/SHMS -3.5/-3.4 GeV) with 3He target, <strong>longitudinal</strong> polarization with NMR every 5 hrs.</li></ul>

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