RC meeting and Run Plan, Sunday November 20th

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RC Meeting Information

No RC meeting today

RC Updates

Summary of swing 11/19 - day 11/20

  • Productive shifts to collect good fraction of data on polarized He3 target @45uA beam current with prescale: ps1=9, ps2=15, ps3=0, ps5=3 and all other -1
  • No major issue on DAQ during this time
  • Bill kept working to maintain oven temperature uniform (less variation over oscillation)
  • Owl shift TO and Bill found temperature jump in HaFiberTemp9 and also the standalone LASER in polhe2 was off from last 3 days https://logbooks.jlab.org/entry/4087720
  • Target polarization 45.8% (yesterday at 5:45pm) and 48.5% (today at 03:05 pm)

Run plan swing 11/20 - day 11/21

  • Continue production data taking on polarized He3
  1. 45uA of beam current | Use ps1=9, ps2=15, ps3=0, ps5=3, 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
  • Consideration to increase beam current to 50uA during tomorrow day shift


  • Dump right Ion chamber cabling needs to be changed => Jerry Kowal will try to fix for short term by changing cable on next longer downtime
  • One more channel of hodoscope has issue https://logbooks.jlab.org/entry/4087074

Charge Accumulation for MCC reporting

Figure: Charge accumulated over time with He3 target