RC meeting and Run Plan, Friday, November 18th

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RC Meeting Information

Time:at 3:30pm today

  • Location: Counting house conference room

RC Updates

Summary of swing 11/17 - day 11/18

  • RF cavity issue after noon, so Gordon took this opportunity to access the hall to optimize oven temperature => variac tripped => hall access continued for manual adjustment (hall back to beam permit around 5 pm) https://logbooks.jlab.org/entry/4086166
  • Continued Moller measurement, changed HWP-IN=>HWP-OUT, and completed measurement about 9:30pm after(Polarization HWPIN: 86.54 +/- 0.17 % and HWPOUT: -87.08 +/- 0.18 %). Large uncertainty on C20 vertical corrector during Moller measurement https://logbooks.jlab.org/entry/4086155
  • Mini spin dance was cancelled due to timing (injector people could not support the dance after 9 pm, PD informed us the cancellation)
  • Issue with RF when we were ready for harp scans before going to production run
  • Beam back around 1:30 am and MCC took ~3 hrs to provide acceptable beam (followed the beam recovery procedure)
  • Target polarization just before production run ~49.3% around 5 am
  • Beam current increased in steps and BBCAL HI rates compared to get to 45uA on He3 target
  • Everything looked good, so continued production run with polarized He3 target @45uA current
  • Some DAQ issue in this morning, Alex was called to fix the issue (suspicion: interference of standalone DAQ for GEM to main DAQ)

Short term run plan

  • Continue production data taking on polarized He3
  1. 45uA of beam current | Use ps3=0, ps5=3, ps2=15, rest =-1 | One hour long runs
  2. Move the target to the pickup coil position, and do NMR sweep around every 3 hours
  3. Return to step 1


  • Dump right Ion chamber cabling needs to be changed (Jerry Kowal is aware of this)

No RC meeting on Saturday and Sunday