WAC Notes November 12 2020

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PREX Main << Weekly Analysis Coordinator << WAC Notes CREX << WAC Post-Run_Meeting Notes

WAC Notes November 5 2020 << >> WAC Notes November 19 2020


Date and time: November 12, 2020, 11:00am
Bluejeans ID: 454783784
Meeting link: https://bluejeans.com/454783784
Runlist spreadsheet

Suggested Changes

Each WAC will suggest changes for their run period, which will be discussed at this meeting:


Beginning of run period 2 - Slug 186

Beginning of the second run period. It is in identical conditions to how we left in March.


  • The pedestals were obtained AFTER the run began, so the first set of pedestals (or global pedestals) need to be updated and back-propagated to this run period as well.

Cuts: Stability cuts were removed, due to the FFB noise in BPM Ys - https://logbooks.jlab.org/entry/3824620


  • Slug 186 - 7626 - was not included before - is the very first run, it has 5 sigma Aq (no Aq feedback) and FFB commissioning/noise, but otherwise is fine
  • Slug 186 - 7627 - was included before - Has 2 sigma Aq (bad Aq feedback). Also, FFB turning on an off is a mess, but as far as I can tell, there is no negative impact on slopes or corrections (so it should be tolerated)
  • Slug 186 - 7628 - needs cuts - One very brief 1.5 mm 12X jump
  • Slug 186 - 7630 - needs cuts - Another brief 1.5 mm 12X jump
  • Slug 186 - 7631 - needs cuts - Another brief 1.5 mm 12X jump
  • Slug 186 - 7632 - Really huge FFB noise... is it worth keeping the 150um + BPM Y RMS data? X is OK.
  • Slug 186 - 7634 - Really huge FFB noise still
  • Slug 186 - 7635 - BPM 1 YP wire looks fishy, otherwise OK. Some BPM 12X noise, very brief. Same FFB noise problems as before.

Day 2 - Slug 187

After a day of work we get more data, with still bad FFB for a while and adjusting tunes.

Also, counting mode alignment run verified the HRSs see different accepted rates (same positions as March running) - https://logbooks.jlab.org/entry/3825555


  • Slug 187 - 7657 - was marked as suspicious - Just normally noisy run, should be fine.
  • Slug 187 - 7658 - expect detector slopes to change, as there was a gang phase adjustment. Compton rates and BPM noise gets muuuch better

Slug 188

Relatively stable running, FFB is now less problematic (still not great) - https://logbooks.jlab.org/entry/3826256

  • Slug 188 - 7681 - Some BPM 12X large noise

Moller quad gets tuned before 7693 - https://logbooks.jlab.org/entry/3826547

  • Slug 188 - 7701 - needs burp cut change - Final FFB on run, has hairy noise (burp cut??) that gets cut too often

Slug 189

BPMs are highly correlated (more so than in prior run periods, killed Japan regression until a code change to make that feature ignored) - https://logbooks.jlab.org/entry/3826978

BMOD ramp channel changed, new pedestal was put in place - https://logbooks.jlab.org/entry/3826991

FFB Off begins now, meaning dpp drifts are a major concern and should be tracked in 12X studies and counting Q2 impacts.

Initial detector and monitor pedestals - 7710, 7712, 7711 (BPM) - https://logbooks.jlab.org/entry/3826991, https://logbooks.jlab.org/entry/3827133






  • Need global cuts on ATs