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.

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






  • Need global cuts on ATs