WAC Notes July 17 2019

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No Prior Day << >> WAC Notes July 18 2019

July 17 2019 Owl Shift

• WAC = Cameron Clarke
• Slug 3 (refer to these runs as slug 3.1)
• Beam Status
  • OWL had ~7 hours of beam, with some sketchy BPM noise and clear BCM DD problems
• Major issue: BCM Upstairs Black box noise on AN_US

Production Run List (status at 6pm 7/17/2019)

• Cut first 30k events out: 3398
• Good: 3399
• Good: 3400
• Good: 3401
• Good: 3402
• Good: 3403
• Good: 3404
• Good: 3405
• Good: 3406
• Good: 3407

Non-Production Runs and Bad Runs

• Calibration (BPM): 3395 - HALOG
• Calibration (BCM): 3396 - HALOG
• Calibration (Restore Beam): 3397 - HALOG

Pedestal/Calibrations Updates

• Tao's Pedestal Update
  • Using: prexCH_beamline_pedestal.3396.map for 50uA runs from slug 3 onward - new BPMs in ARC need attention
  • Using: prexCH_beamline_pedestal.3395.map - use it as a template pedestal map for 70 uA runs.
  • I've taken prexCH_beamline_pedestal.3396.map and placed it in the prexCH_beamline_pedestal.3390-.map
• Caryn's Hall C and cav4cQ pedestals (3373 and 3378 respectively)

Issues

• Tuning 3397 - HALOG
• Charge Feedback glitch: non-fatal QW Feedback process fighting with Analysis Minder - HALOG, HALOG
• OPS FFB on: for a few minutes of run 3398 - HALOG
• Strange beam motion at beginning of 3398 - HALOG
• BCM Noise/phase lag question: Begins run 3400, varies, investigated on scope, looks like BCM black box issue - HALOG, Sakib noted, Victoria noted
  • Looked at on a scope with Tune Beam and changing all cables isolates it to a electronics/hardware issue in the Upstairs black box, not downstairs.
  • This will need to be fixed, but probably the data is fine.
• BPMs have strange noise, especially 4eY: Beings run 3399 - HALOG
• Compliment BPMs don't have this noise (anecdotal), and their DDs w.r.t. normal BPMs is noticeable - HALOG, HALOG 2
• At Left 1 is - w.r.t. At Left 2, and this isn't mirrored in Right - Devi says this is beam related, and HVs were off...
• Main Detectors R vs. L correlations shift in time? -> Kent says this is normal and has to do with beam motion sensitivity - HALOG
• LHRS Dipole moved a bit - HALOG, [1]

Other Status Updates

• Beam Mod is OK - HALOG
• Aq is working, nothing more than ~0.2 ppm mean charge asymmetry over a given run, many sub 0.02 ppm - See Online Plots
• SAM pedestals made SAM 8 look like a negative signal, was spurious, Devi is fine with it

July 17 2019 Swing Shift

• WAC = Cameron Clarke
• Slug 3 (call this slug 3.1)
• Beam Status:
  • Day had no beam
  • Swing had 4 hours of beam, with BCM DD problems still remaining, and now the BCM widths are 128 ppm too.
• Major issue: BCM DD noise, and now BCM noise too. Main dets corrected down to 120 ppm only.
• Moved to 70 uA current and recalibrated gains and took new pedestal/current ramp run

Production Run List (status at Midnight, end of 7/18/2019)

50 uA

• Good (cut first 40k events due to excursion): 3420
• Good: 3421
• Good: 3422

---

70 uA Changed to 70 uA!

• Good: 3425
• Good: 3426
• Good: 3427
• Good: 3428
• Needs Cut: 3429

Non-Production Runs and Bad Runs

• 50 uA, Suspicious, don't include in run list: 3419
• Pedestal/Current Scan: 3424 - scanned up to and around 70 uA -> Kent says its good
• Pedestal/Current Scan: 3430 - rescanned from 10 to 70 uA

Pedestal/Calibrations Updates

• Tao's pedestal calibrations from yesterday
  • 70 uA data from 3425 and onwards: I use prexCH_beamline_pedestal.3395.map - as a template pedestal map for 70 uA runs

Issues

• BCMs got noisier during Swing (the beam is noisier) and DD noise comes and goes: HALOG
• Data looks like DS detectors saturating

Other Status Updates

• Feedback engine gets some work to make it change more than just PITA values safely: 1, 2, 3
• BCM DG splitter was replaced, and then unreplaced: 1
• Bob and Silviu have changed the target encoder to properly center the target (this should not affect the blinder): HALOG