[Hallc_running] [New Logentry] Hall C RC Update (Sept 17)

Thu Sep 17 13:30:02 EDT 2020

Logentry Text:
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<p> </p><p><strong>RC Daily Meetings are M-F at 4:15 PM</strong></p><pre>To join the Meeting:  <a class="external free" href="https://bluejeans.com/861439920" rel="nofollow">https://bluejeans.com/861439920</a>
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</pre><p><strong> Thursday 17 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>Production running in Kin-C, Kin-Z at transverse/270 (T1 trigger only) resumed around 1pm Wed</li><li>SHMS collimator readback went nuts <a class="external autonumber" href="https://logbooks.jlab.org/entry/3849940" rel="nofollow">[1]</a>, data look OK though <a class="external autonumber" href="https://logbooks.jlab.org/entry/3850119" rel="nofollow">[2]</a><ul><li><a class="external text" href="https://hallcweb.jlab.org/DocDB/0010/001002/002/Instructions-power-cycle-HallC-collimators.pdf" rel="nofollow">Power cycle the controllers</a> in the Hall at next access.</li></ul></li><li>Laser polarimetry computer (polhe4) crashed around 3am <a class="external autonumber" href="https://logb!
 ooks.jlab.org/entry/3850134" rel="nofollow">[3]</a>, needed some experts to support getting things running again, but didn't impact data taking too much. Documentation is being updated.</li><li>Target polarization holding around 39% <a class="external autonumber" href="https://logbooks.jlab.org/entry/3850384" rel="nofollow">[4]</a>, <a class="external autonumber" href="https://logbooks.jlab.org/entry/3850252" rel="nofollow">[5]</a>, <a class="external autonumber" href="https://logbooks.jlab.org/entry/3850014" rel="nofollow">[6]</a></li><li>Lost RF at 11:00am <a class="external autonumber" href="https://logbooks.jlab.org/entry/3850408" rel="nofollow">[7]</a></li><li>Still waiting for recovery (1:30pm)</li></ul><h2><span id="Notes_for_the_Future" class="mw-headline">Notes for the Future</span></h2><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<!
 ul><li>RadCon will enter at 6am and complete the Hall survey b!
 y themselves. Others will enter when that is complete (6:45 or so)</li><li>Unplug raster Coil B [Bill G] (MCC needs to update settings on their end; system needs testing -- Brad)</li><li>Reset SHMS collimator controls (Brad)</li><li>Install collimator in target (JP, RadCon)</li><li>Change spectrometer angles (Steve L, Techs will support)</li><li>EPR photodiode will NOT be replaced (Junhao reports it should be OK, can also replace after run) <a class="external autonumber" href="https://logbooks.jlab.org/entry/3849668" rel="nofollow">[8]</a></li><li>Hall A will setup the charge-asym feedback system for us (P. King, et al)<ul><li><a title="Charge Feedback Parity DAQ" href="https://hallcweb.jlab.org/wiki/index.php/Charge_Feedback_Parity_DAQ">Charge Feedback Parity DAQ</a> Instructions will need to be followed by Shift Crew -- We will have to run the 'flipper script'</li></ul></li></ul></li></ul><p> </p><ul><li>Bill, Murchhana check compass/field measurements<ul><li>Also ch!
 ecking 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>Start prepping for post-run work<ul><li>See <a title="D2n Run Plan 2020" href="https://hallcweb.jlab.org/wiki/index.php/D2n_Run_Plan_2020#POST-run_Calibrations.2FMeasurements">POST-run Calibrations/Measurements</a> for list</li></ul></li></ul><h2><span id="Pending_Issues" class="mw-headline">Pending Issues</span></h2><ul><li>Review and do any final prep/planning for 1-pass running<ul><li>Paddle optimization for 3He Elastic xsec running [Chao]<ul><li>Done. Same paddles as before. A dA/A:2--3% measurement will require ~16 hours</li></ul></li><li>Junhao has some estimates of the NMR calibration coeffs for 1-pass 0 and 180 settings <a class="external autonumber" href="https://logbooks.jlab.org/entry/3849028" rel="nofollow">[9]</a></li></ul></li></ul><ul><li>Beam energy drifts<ul!
 ><li>Should confirm that MCC remembers to shift the energy lock to Hall!
  C when Hall A turns off</li><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>SHMS collimator readback went nuts <a class="external autonumber" href="https://logbooks.jlab.org/entry/3849940" rel="nofollow">[11]</a>, data look OK though <a class="external autonumber" href="https://logbooks.jlab.org/entry/3850119" rel="nofollow">[12]</a><ul><li><a class="external text" href="https://hallcweb.jlab.org/DocDB/0010/001002/002/Instructions-power-cycle-HallC-collimators.pdf" rel="nofollow">Power cycle the controllers</a> in the Hall at next access.</li></ul></li></ul><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></li></ul></li></ul><h1><span id="Current_Run_Plan" class="mw-headline">Current Run Plan</span></h1><h2><span id="Thursday_DAY_.E2.86.92_Thursday_SWING" class="mw-headline">Thursday DAY → Thursday 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 Kin-C and Kin-Z settings use the <strong>T1</strong> trigger <em>only</em></li></ul></li></ul><h2><span id="Friday_OWL" class="mw-headline">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 Kin-C and Kin-Z setting!
 s use the <strong>T1</strong> trigger <em>only</em></li></ul></li><li><!
 strong>6 am</strong>Friday Morning<ul><li>Ensure RadCon is ready to enter Hall</li><li>RadCon will survey Hall and begin transition to Controlled Access</li><li>Stop beam, take NMR/pNMR</li><li>Rotate target to Longitudinal/180, switch on longitudinal lasers<ul><li>Continue to pump in longitudinal direction until 6:30pm or so</li></ul></li><li>Shut off lasers and lock-out fibers<ul><li>All personnel (RadCon, Techs, and Target personnel) must attach their LOTO locks</li></ul></li></ul></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><li><strong>NOTE</strong>: Hall C is in control of the Charge Asymmetry feedback system until Monday<ul><li><a title="Charge Feedback Parity DAQ" href="https://hallcweb.jlab.org/wiki/index.php/Charge_Feedback_Parity_DAQ">Charge Feedback Parity DAQ</a> Instructions</li><li>We will have to run the <code> ./FlipPCvaluesHallC</code> script in the Parity DAQ VNC session after every IHWP change</li></ul></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 xs!
 ec measurement</li><li>Pressure curves</li></ul></li></ul></li><li><str!
 ong>NOTE</strong>: Hall C is in control of the Charge Asymmetry feedback system until Monday<ul><li><a title="Charge Feedback Parity DAQ" href="https://hallcweb.jlab.org/wiki/index.php/Charge_Feedback_Parity_DAQ">Charge Feedback Parity DAQ</a> Instructions</li><li>We will have to run the <code> ./FlipPCvaluesHallC</code> script in the Parity DAQ VNC session after every IHWP change</li></ul></li></ul><p> </p>

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