RC meeting and Run Plan, Sunday December 4th

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RC Meeting Information

Data taking has been smooth. No RC meeting for today, Have a nice weekend!


Bill will host a target training session on next Monday after the RC meeting. We have lots of TO shifts open; please take the chance to join the session

Current Status

  • Very smooth production run on He3 target @ 36 uA. No big interruptions.
  • NMR polarization - 46.8% (rough) at the time of this log entry
  • During Saturday Swing shift, MCC temporarily dropped us to 30 uA due to RF instability issue, I checked with MCC, and confirmed that this is only temporary, as long as they have better RF stability, they will bring us back to 36 uA.
  • Jiwan, Alexander, Bryan and Ben traceing the cause of the HCal f1TDC 1 & 4 timing shift issue (see a log https://logbooks.jlab.org/entry/4095193 ). Up to now, this issue only shows up in a single run 3005. Jiwan put specific instructions on what to do when we encounter this issue again. We will keep an eye on it.
  • There are a few runs with 50 K replay missing SBS GEMs plots due to the oversized pdf file, which blocked them from being posted to the logbook. Sean reduced the pdf file size by removing a few histograms. The later runs seem fine since then.
  • For future shift takers, MCC gave us an option for checking beam restoration status. Please check a detailed description in a log by Iuliia [ https://logbooks.jlab.org/entry/4094990 https://logbooks.jlab.org/entry/4095153 ]
  • Target increased laser power from 144 W to 155 W, please see a summary log entry by Jack ( https://logbooks.jlab.org/entry/4095195 )
  • Paul ran the charge asymmetry feedback briefly during run 10038, please see log entries by Paul ( https://logbooks.jlab.org/entry/4095262 https://logbooks.jlab.org/entry/4095247 https://logbooks.jlab.org/entry/4094291 )
  • No major issue in OWL shift
  • Sunday morning, MCC brought us back to 36 uA beam

Short Term Run Plan

  • Continue production run on He3 target, 36 uA
  • Use GEnII-3stream DAQ config
  • Use ps3=0, ps5=6, others =-1
  • BBCal threshold at -366 mV, HCal threshold at -19 mV
  • NMR measurement every 2 hours

Current Issues

Planned Accesses to the Hall

  • Will try to arrange an escorted access for fixing hodoscope when we have a long beam down ( longer than 1 hour).

Special Requests

  • None

Notices in Effect for Shift Crew

  • Power down SBS, BB, and Detector HV before making an access to the Hall