Difference between revisions of "WAC Notes July 22 2019"

Latest revision as of 20:37, 30 July 2019

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WAC Notes July 21 2019 << >> WAC Notes July 23 2019

July 22 2019

Production Run List Swing 2019/07/21 - 2019/07/22 Owl

Start Slug 11, IHWP Out, FFB on always, no RHRS on 3564, junk until 3566

• Dangerous Junk - 3564: HVs off on left arm - don't analyze, as it will confuse and reveal blinder due to bad pedestals/null signal/blinding confusion
• Dangerous Junk - 3565: ""
• Good - 3566: Begin production on slug 11, bcm width is quite large - 200 ppm, and minirun 4 has 185 USL ppm width, which is inexplicable as far as I can tell
• Good - 3567: large beam trip at end, BCM width got better this run
• Good - 3568
• Good - 3569
• Good - 3570: Aq ~ 0.5 ppm
• Good - Blinder failed, needed cuts - 3571: Needs cuts to recover - got its cuts and its good
• Good - 3572
• Good - 3573: Charge feedback went off for some events - needs cuts - it got its cuts and is OK now
• Good - 3574: BPM 12 slips during FFB off times
• Good - 3575
• Good - 3576

Non-Production Runs and Bad Runs

• Dangerous Junk - 3564: HVs off on left arm - don't analyze, as it will confuse and reveal blinder due to bad pedestals/null signal/blinding confusion
• Dangerous Junk - 3565: ""
• Good - Blinder failed, needed cuts - 3571: Needs cuts to recover - fixed
• Good - Needed cuts - 3573: Charge feedback went off for some events - needs cuts - fixed

Pedestal/Calibrations Updates

Issues

• There is slowness in the computer system - Ole thinks it has to do with a combination of heavy ethernet load, heavy Cache usage, and a poorly calibrated Scheduler
  • Panguin as a test, 20x longer on adaq1, ps says its in nfs_wait mode
  • logging all users out seems to fix it - (Cameron's theory is that ctrl+Z's processes were laying around everywhere and were occupying nfs file system attention that shouldn't have been)
  • https://logbooks.jlab.org/entry/3708226, https://logbooks.jlab.org/entry/3708217, https://logbooks.jlab.org/entry/3708222
• Caryn is working on pedestal studies
  • 3708263
• Caryn is also working on investigating Aq double peaking in the injector
  • 3708239
  • 3708254
• No beam all day due to LCW leak in west arc: HALOG

New Cuts

Applying detector Volts/uA cut to remove HV trips (LHRS 3564-3565) globally, and Quad mistunes and non-normalization (Slug 8->) locally

• HALOG

Looking at the effect of global, generous position yield cuts

• HALOG

Other Status Updates

• Accumulated charge = 11.33 Coulombs, 1.03 x PREX 1 statistical error bar
• Slug 11 is the final with the old PREX 1 quartz - from here on we are using different quartz: HALOG
• LHRS Counting Mode analyzer has major slowness
  • It seems to be spending too much time in tracking
  • Maybe a bad line in a db file?
  • Actually it looks like the data itself is somehow difficult to parse / bad electronics, or some kind of power supply noise?
  • Bob checks the electronics and it doesn't seem to be that... software/aonl?
  • Its in PODD/the VDCs both!!
• Catherine has gone through permutations of BPM regression sets and has found that 11X is superior to 12X: HALOG, HAPLOG
• The RQ2 has some issues, largely to do with accumulated condensed/depositted/melted water around the quench detection circuit