[Hallc_running] [New Logentry] RC Daily Update

cyero at jlab.org cyero at jlab.org
Thu Sep 3 08:55:02 EDT 2020

Logentry Text:
<b>Accelerator Status:</b>
  <li>RF recovery (Day Shift)
     <li>Beam restoration (~ 2 additional hours)</li>
  <li>Beam delivered to Hall C (~10 pm)</li>
  <li>Very stable beam over Owl Shift  (<a href="https://logbooks.jlab.org/entry/3840114">Owl_Beam_Summary</a>) </li>

<b>General Hall C Updates:</b>
  <li>Target work completed (Sep 02, Day Shift):
    <li>Beam positions at ALL d2n glass cell targets (determined from laser alignment, Bill & Arun) were estimated to be (X,Y) = (0,0) mm.</li>
    <li>Reference cell (Fauci) has been evacuated (vacuum).</li>
    <li>Pol He3 Cell is set for transverse (+90 deg) polarization. (See 'Recent NMR measurements' for updates)</li>
  <li>Beam delivery at Hall C (Sep 02-03, Swing/Owl Shifts):
    <li>Beam checkout completed.</li>
    <li>Reference cell filled with Hydrogen.</li>
    <li>Verified beam positions determined from laser alignment to be at (0,0) mm for glass cells <a href="https://logbooks.jlab.org/entry/3839905">C-hole_and_Scraping_Tests</a></li>
  <li>d2n production data-taking (Sep 03, Owl Shift):
      <li>Electron paramagnetic resonance (EPR) tests/calibration completed (Junhao Chen, 1-2 hrs expected, started at ~ 2:00 am)
	  <li>Junhao required planned controlled access as part of EPR tests (3:22 am)</li>
      <li>Harp scans were done again (3:51 am) as there was a controlled access <a href="https://logbooks.jlab.org/entry/3839972#comment-30593">IH3H07A</a>,  <a href="https://logbooks.jlab.org/entry/3839977">IH3H07B</a> </li>
      <li>Begin reference cell (for H2 and then N2, 1-hr-long run each) data-taking at Kin-A (HMS) and Kin-X (SHMS) at 4:04 am </li>
      <li>Changed spectrometer kinematics to Kin-B (HMS), Kin-Y (SHMS) for 3 hrs of data at ref. cell (H2) and 3 hrs at (N2) </li>
      <li>Moller measurement commenced at 8:00 am right after the kinematics change.</li>

<b>Recent NMR Measurements (Before EPR calibration):</b><br>
  NOTE: Need to update "polarization.vi" fitting program with new EPR calibration constant (5.24 % / mV):  <a href="https://logbooks.jlab.org/comment/30596#comment-30596">EPR_Calib_Constant</a> 
  <li> 6:30 pm -> 27.6 %  <a href="https://logbooks.jlab.org/entry/3839670">https://logbooks.jlab.org/entry/3839670</a></li>
  <li> 8:41 pm -> 29.8 % <a href="https://logbooks.jlab.org/entry/3839726">https://logbooks.jlab.org/entry/3839726</a></li>
  <li> 11:43 pm -> 32.7 %  <a href="https://logbooks.jlab.org/entry/3839829">https://logbooks.jlab.org/entry/3839829</a> <br>
  ------NMR measurements taken after EPR Calibration------- </li> <br>
  <li> 3:12 am -> 24.2 % <a href="https://logbooks.jlab.org/entry/3840077">https://logbooks.jlab.org/entry/3840077</a> </li>
  <li> 5:16 am -> 27.2 % <a href="https://logbooks.jlab.org/entry/3840077">https://logbooks.jlab.org/entry/3840077</a> </li>
  <li> 7:56 am -> 27.6 % <a href="https://logbooks.jlab.org/entry/3840080">https://logbooks.jlab.org/entry/3840080</a> </li>

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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/3840132
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