[Hallc_running] [New Logentry] Hall C RC Update (Sept 14)

Mon Sep 14 17:25:02 EDT 2020

Logentry Text:
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<p><a class="new" title="RC Update and Run plan for Sep 14,2020" href="https://hallcweb.jlab.org/wiki/index.php?title=RC_Update_and_Run_plan_for_Sep_14,2020">RC Update and Run plan for Sep 14,2020</a></p><p><strong> Monday 14 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>Smooth running once beam came back at 4pm yesterday<ul><li>Took production in Kin-A, Kin-X in transverse/90 w/ triggers T1, T3 (and some T2)</li><li>Will likely switch to T2 triggers (EL_real) for rest of Kin-A, Kin-X running (confirm)<ul><li>T2 and T3 cut out a fair bit of garbage at forward angles, particularly in the SHMS</li><li>Charge normalized yields look comparable for both T2 and T3 (vs T1), but T2 is safer than T3 so we will go with that trigger for remaining Kin-X and Kin-A runni!
 ng</li></ul></li></ul></li><li>Beam Studies underway from 10am to ~9pm (including recovery) with opportunity for 5-pass running mid-day<ul><li><strong>10am</strong>: Hall C entered <em>Controlled Access</em> as planned</li><li>Target work (2 tasks currently planned; RadCon support needed)<ul><li>Replace a spectrum analyzer mounting plate. Updates: <a class="external autonumber" href="https://logbooks.jlab.org/entry/3848155" rel="nofollow">[1]</a>. Re-entered Hall at 3pm (no light in analyzer now) <a class="external autonumber" href="https://logbooks.jlab.org/entry/3848175" rel="nofollow">[2]</a>. Issue corrected <a class="external autonumber" href="https://logbooks.jlab.org/entry/3848241" rel="nofollow">[3]</a></li><li>Take a compass measurement of the field at the carbon foil ladder position if possible. Updates: <a class="external autonumber" href="https://logbooks.jlab.org/entry/3848226" rel="nofollow">[4]</a> Initial impression is that these measurements are consistent !
 with Bill/Murchhana's earlier measurements. So target field an!
 gle is not the driver for lower than expected polarization.</li><li>Rotate target to <strong>Transverse/270</strong> -- Done <a class="external free" href="https://logbooks.jlab.org/entry/3848250" rel="nofollow">https://logbooks.jlab.org/entry/3848250</a>], <a class="external autonumber" href="https://logbooks.jlab.org/entry/3848280" rel="nofollow">[5]</a></li></ul></li><li>SOLID cherenkov config change (in parallel) [Done]</li><li><strong>4:15pm - 9:15pm</strong>: Beam studies, part 2</li><li>Requires beam to Hall C dump. Position locks at our target should remain <strong>ON</strong>; MCC will use a <strong>0.5mm raster</strong>;<ul><li>Talked to Dan Moser: MCC will start with 10uA tune beam and manipulate injector parameters while logging various beam data. Later will switch to 10--30 uA CW and repeat.</li><li>We'll try to take some C-optics data parasitically</li></ul></li><li><strong>9:15pm<em>: Continue production running in Kin-A, Kin-X at transverse/270</em></strong>!
 <em> after standard beam profile checks.</em></li></ul></li></ul><h2><span id="Notes_for_the_Future" class="mw-headline">Notes for the Future</span></h2><ul><li>Melanie, Murchhana, Chao, Sylvester: please check good electron yields per Coulomb for Kin-A/X runs with T1 vs. T3 (T2)<ul><li>Mostly complete. Early results don't show any surprises..</li><li>We will continue with 1 hour (<strong>T1</strong>) + 3 hours (<strong>T2</strong>) [and repeat] for remaining Kin-A, Kin-X running</li></ul></li></ul><ul><li>Moller measurement planned for Wednesday DAY (tentative)</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> transition scheduled for 6am Friday, Sept 18</li></ul><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]<ul><li>Summary log entries: EPR(270, Kin-Z) <a class!
 ="external autonumber" href="https://logbooks.jlab.org/entry/3847972" r!
 el="nofollow">[6]</a>, EPR(90, Kin-X) <a class="external autonumber" href="https://logbooks.jlab.org/entry/3848215" rel="nofollow">[7]</a></li><li>No issues found -- 'online' calibrations look good</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>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">[8]</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 t!
 o 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">[9]</a></li></ul></li></ul><h2><span id="Opportunistic_Jobs.2FAccess" class="mw-headline">Opportunistic Jobs/Access</span></h2><ul><li><dl><dt>Target calibrations / tests (Particularly anything that will be needed at 1-pass!)</dt></dl><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><ul><li>NOTE: Moller planned for Monday</li></ul></li></ul></li></ul><h1><span id="Current_Run_Plan" class="mw-headline">Current Run Plan</span></h1><h2><span id="Monday_SWING_.E2.86.92_Tuesday_OWL" class="mw-headline">Monday SWING → Tuesday OWL</span></h2><ul><li>Beam studies will run from 4:15pm to 9:15pm (or so)<ul><li>Requires beam to Hall C dump. <strong>We must monitor beam positions on the stripchart!</strong></li><li>Position locks at our target should remain <strong>ON</strong></li><li>MCC will use a <strong>0.5mm raster</strong> for the entire beam studies program</li><li>We will start with <strong>No Target</strong>position<ul><li>Talked to Dan Moser: MCC will start with 10uA tune beam and manipulate injector parameters while logging various beam data. Later will switch to 10--30 uA CW and repeat</li></ul></li><li><strong>When MCC switches to CW mode</strong><ul><li>Request !
 target be masked to move target to <strong>C-Optics</strong></li><li>Take 1 hour C-Optics runs with T2 trigger on both SHMS and HMS. Just keep the runs going; don't worry about beam trips or pauses. Adjust prescales to keep the rates around 3.5 kHz in both arms, but no need to 'fine tune', a little extra deadtime is fine for parasitic optics running.</li><li>Add a run-comment that these runs were taken during the Beam Studies program in the Shift Summary and Run database using the <code>add_run_comment</code> command.</li></ul></li></ul></li></ul><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.<ul><li><strong>NOTE</strong>: Take 1 run with <strong>T1</strong>(3/4) trigger; then 3 runs using <strong>T2</strong>(EL_real) trigger; <strong>Then repeat that cycle.</strong><ul><li>Be sure to monitor and set the prescales correctly.</li><li>Put <strong>T1</strong> or <strong>T2</strong> in !
 the CODA comments field for the runs.</li><li>Note the <strong>T1</stro!
 ng> or <strong>T2</strong> trigger type for each run in the Shift Summary and Run database using the <code>add_run_comment</code> command.</li></ul></li></ul></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.<ul><li><strong>NOTE</strong>: Take 1 run with <strong>T1</strong>(3/4) trigger; then 3 runs using <strong>T2</strong>(EL_real) trigger; <strong>Then repeat that cycle.</strong><ul><li>Be sure to monitor and set the prescales correctly.</li><li>Put <strong>T1</strong> or <strong>T2</strong> in the CODA comments field for the runs.</li><li>Note the <strong>T1</strong> or <strong>T2</strong> trigger type for each run in the Shift Summary and Run database using the <code>add_run_comment</code> command.</li></ul></li></ul></li></ul><pre>-- General plan below this po!
 int is fixed, but details may be adjusted as beam/target requires --
</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.<ul><li>All runs for these settings use the <strong>T1</strong> trigger <em>only</em></li></ul></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.<ul><li>All runs for these settings!
  use the <strong>T1</strong> trigger <em>only</em></li></ul></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.<ul><li>All runs for these settings use the <strong>T1</strong> trigger <em>only</em></li></ul></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 Longitudi!
 nal/180 (TBD)</li></ul><ul><li>Close up and wait for MCC to es!
 tablish (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><p> </p>

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