WAC Notes February 9 2021

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

WAC Notes February 5 2021 << >> WAC Notes February 16 2021


Date and time: February 9, 2021, 11am
Bluejeans ID: 454783784
Meeting link: https://bluejeans.com/564945377
Runlist spreadsheet

February 9th 2021

Special investigations to finish cleaning up the runlist and cuts:

  • Burp cuts too tight around 7800 run range
  • Limit cuts slice data off after pedestal shifts in respin1

February 5th 2021

Finishing up looking at BPM issues and Aq issues

  • 7790-7794 run range has a BPM Y hairy noise that is in all BPMs
    • Check if the beam trip recovery is at fault
    • If needed add a Y hard limit cut to some of these runs (maybe 4eY)
    • See also: Run 7259 also has X noise in all the BPMs for no clear reason
  • 7719 has some low current data during beam trip times that make it past > 80 uA cut
    • We should try to cut out low current data, particularly if it is during very trippy periods
    • They don't matter a whole lot
  • Large Aq runs: http://ace.phys.virginia.edu/HAPPEX/4457
    • The bad ones are already under suspicion, remaining runs will be checked for bad beam positions or other fatalities (large Aq alone is not fatal)

Convenient Agg scans:

  • Aq scan (2 sigma cut)
    • agg->Scan("rcdb_run_type:rcdb_run_flag:run_number:minirun_n:n_runs:yield_bcm_target_mean:yield_bpm12X_mean:1:asym_bcm_target_mean/ppm:asym_bcm_target_mean_error/ppm:asym_bcm_target_rms/ppm:(asym_bcm_target_mean/asym_bcm_target_mean_error)","abs(asym_bcm_target_mean/asym_bcm_target_mean_error)>2")
  • BCM yields per minirun
    • agg->Scan("run_number:minirun_n:yield_bcm_target_mean:yield_bcm_target_rms:rcdb_run_type:rcdb_run_flag","rcdb_run_flag==1 && yield_bcm_target_mean<120")
    • Change the low current cut to get an idea

February 2nd 2021

BPM 1X and 12X look stable and have reasonable noise, coming from Devika's analysis of BPMs vs. eachother.

Looking at 12X and Target BPM jumps/shift runs: http://ace.phys.virginia.edu/HAPPEX/4428

  • BPM Target matter for avoiding copper
  • BPM E matter for avoiding inelastics and preserving regression stability

Need to finish looking at BPM jumps on Friday

February 1st 2021

Finish looking over runs:

  • Finished looking at NeedCut and Suspicious runs - suggestions live in spreadsheet
  • Pedestals for BPMs are all over the place, and cause yield shifts
    • These yield shifts bump into limit-cuts for target BPMs at least once, and likely more - see HAPLOG 4454
    • BPM 12X sees a 0.3mm shift during CREX part 2 vs. it's prompt value, this likely causes cut issues too
    • Reverify pedestal values used in respin1
    • Recheck pedestal analyses for quality

January 29th 2021

We looked at the run lists generated by WACs over the last few weeks and blessed suggestions or suggested new things to do to fix runs with obvious issues or solutions:


We'll meet again on Monday (starting at 7994 in the NeedCut list) and also look at the BPM jump run list (http://ace.phys.virginia.edu/HAPPEX/4437)

January 26th 2021

Last day of going over issues and populating the WAC lists. A number of comments and notes are listed here, including possible merging of slugs, etc.