WAC Notes August 13 2020

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WAC Notes August 12 2020 << >> WAC Notes August 14 2020

August 13 2020

Daily Meeting BlueJeans

Production Run List - Slug 188 - IHWP OUT - Flip-RIGHT - Production/Recommissioning

• Good - Run 7679 - Everything looks way better. Still has RHRS more noisy, but the BPMs are much cleaner all around. 120 uA to avoid high compton background rates - first Compton ON data we've had
• Good - Run 7681 - looks good
• Good - Run 7682 - looks good
• Good - Run 7683 - looks good
• Good - Run 7684 - looks good
• Good - Run 7685 - looks good
• Good - Run 7686 - looks good
• Good - Run 7687 - looks good

Non-Production Runs and Bad Runs

• Junk - Run 7678 - Carbon 1% compton commissioning
• Junk - Run 7680 - Carbon 1% compton commissioning
• Junk - Run 7688 - 20 seconds beam on junk run

Issues

• FFB issues at the beginning of the shift, but Gang Phase adjustments seem to get it down to a manageable level
  • Eventually got better: https://logbooks.jlab.org/entry/3826256
• There was concern over the RHRS having worse RMS regressed asymmetry
  • There is a ~30 ppm worse RHRS width, due to LHRS having 3mm more acceptance of inelastics
  • There was a false alarm of high width due to misusing 4aX BPM instead of 1X in the regressed histogram in panguin... oops!
  • Devi took an alignment run (with no dpp...) and sees everything is almost exactly as it was in March

Updates

• Detectors are in exactly the same spots and conditions as in March
• Pedestals need to be obtained in a few days and these runs reprompted