RC Update and Run plan for Sep 13,2020

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RC Meeting Information

RC Daily Meetings are M-F at 4:15 PM 

To join the Meeting:  https://bluejeans.com/861439920
To join via phone :  +1.408.740.7256 (US (San Jose)), +1.888.240.2560 (US Toll Free))

Sunday 13 Sept 2020.

General updates

(See d2n Run Plan 2020 for broader status/overview.)

  • Down from 1am until (tbd) for series of issues with the chopper in the Injector [1] and south linac [2]. Problem with 1L17 that took us down yesterday doesn't look fixed either [3].
    • Took this time to take access to reset spectrometer rotation (tripped on Friday around the same time as the HMS dipole I guess)
  • Set spectrometers to Kin-A, Kin-X Sunday morning and will continue with 90-deg running when beam returns
  • Max Target Tommy polarization @ 90 since yesterday has been 38.5% [4], it seems to have plateaued at 37% today [5], [6]
    • For comparison, maximum seen with target at 90 deg last week was 44% (9/5/2020 22:56:38)
    • FWIW, that is similar to the maximum seen at 270 was 37.5% [7]; Recent max around 36% (Thursday) [8]
  • Junhao reports the spectrum analyzer parts are ready to go for Monday
    • RadCon has been looped in and will support
  • Target should be rotated to 270 deg on Monday

Notes for the Future

  • Beam Studies planned for Monday @ 10am to 6pm (including recovery), Sept 14
    • RadCon will support going to CA at 10am, we can stay in CA for roughly 2 hours; OPS wants Hall C dump available after that
    • Simona wants access at this time for SOLID cherenkov related work
    • Target work
      • Install spectrum analyzer collimator
      • Check field at target region for 270 setting, if possible
      • Want to determine field direction at the precision of a few degrees vs the alignment laser
    • Bill, Murchhana check compass/field measurements and will report back at Sat RC meeting
  • 1-pass running tentatively scheduled for Sept 17/18
    • Hall A would like a specific date soon so they can finalize their end-of-run plans

Pending Issues

  • Check EPR calibrations (particularly for 270deg setting, but others too) [Melanie]
  • Magnet EPICS PV timeout issue; perhaps reboot skylla10 on Monday?
    • Some Magnets Channels Lost Connection Briefly [9] (Saturday, 2pm)
    • Also had to add more error checking to the angle reporting in the CODA run-start GUI last week too (same softIOC as above)
    • 'Heartbeat' issue reported by Steve Lassiter last week
  • Target polarization for Tommy @ 270 is low (mid to high 30s); Tommy @ 90 seems to have plateaued at 38%
    • Spectrum analyzer collimator was broken at some point and present optics setup may be allowing transient light to interfere with spectrum measurement and QWP scans
    • JP wonders if the field direction is off for the transverse settings (Bill, Murchhana: see note in Target group chat from late Thursday)
  • Beam energy drifts
    • Just something to keep an eye on. Has not been a problem lately.
    • Hall C 5-pass polarization goes down as energy (HALLC:p) goes up [10]

Opportunistic Jobs/Access

Current Run Plan

Sunday DAY → Monday OWL

  • Monday at 8am Move spectrometers to Kin-A, Kin-X and continue Transverse/90 running there
    • Update correction coil settings for Kin-X HB field [Done]
  • Continue production data in Kin-A, Kin-X with pol 3He target, Transverse/90 polarization with pNMR/NMR every 5 hrs.

Monday DAY

  • 10am: Hall C will enter Controlled Access as planned
    • Target work (2 tasks currently planned; RadCon support needed)
      • Replace a spectrum analyzer mounting plate
      • Take a compass measurement of the field at the carbon foil ladder position if possible [TBD]
      • Rotate target to Transverse/270
    • SOLID cherenkov config change (in parallel)
  • Lock-up Hall when done and take data (Ref cell, Optics?) until 2nd part of beam studies begin
  • 4:15pm - 9:15pm: Beam studies, part 2
    • Requires beam to Hall C dump, but no production running will be practical (as I understand it)
  • 9:15: Continue production running in Kin-A, Kin-X at transverse/270' when beam returns

Monday SWING → Tuesday OWL

  • Continue production data in Kin-A, Kin-X with pol 3He target, Transverse/270 polarization with pNMR/NMR every 5 hrs.

Tuesday DAY → Tuesday SWING

  • Continue production data in Kin-A, Kin-X with pol 3He target, Transverse/270 polarization with pNMR/NMR every 5 hrs.
-- Items below this point are still tentative --

Wednesday OWL → Wednesday SWING

  • Moller measurement on Wednesday DAY
    • This will also be used to infer polarization at 1-pass (if it fails, we'll try again on Thursday DAY)
  • Wednesday OWL or DAY during Moller Move spectrometers to Kin-C, Kin-Z and continue Transverse/270 running there
  • Continue production data in Kin-C, Kin-Z with pol 3He target, Transverse/270 polarization with pNMR/NMR every 5 hrs when Moller complete.

Wednesday OWL → Wednesday SWING

  • Continue production data in Kin-C, Kin-Z with pol 3He target, Transverse/270 polarization with pNMR/NMR every 5 hrs.

Thursday OWL → Friday OWL

  • Continue production data in Kin-C, Kin-Z with pol 3He target, Transverse/270 polarization with pNMR/NMR every 5 hrs.
  • 6 am Move to Controlled Access (w/ RadCon support) to begin transition to 1-pass

Friday DAY

  • (Started at 6am) Open target enclosure
    • Install collimators (JP, RadCon)
    • Check on EPR photo-diode status, likely replace it? (JP, RadCon)
  • Ensure fast raster is reconfigured correctly (Expert: Jones, Gunning)
  • Rotate to minimum angles for HMS (11.7) and SHMS (8.5) (S. Lassiter, A. Comer)
  • Configure target for Longitudinal/0 or Longitudinal/180 (TBD)
  • Close up and wait for MCC to establish (1-pass) beam to the Hall

Friday SWING → Monday

  • See task list at Run Plan for 1-pass for more details
    • Initial priority will be PbPt polarization cross check with longitudinal pol. elastics.
    • These have lower priority but will likely be pursued while target spins up
      • 3He, N2 density measurements
      • H2 xsec measurement
      • Pressure curves


Standing Orders

  • Change the IHWP at least every 8 hours when running on glass cells. Call Halls A and B in advance. If there are any issues, call the RC
  • Ensure that all information in the CODA run-start GUIs is correct for every run!
  • If beam goes away for more than 3h, or MCC does operations on the beam that may change the beam tune, then move target to No Target position,
    • verify Harps scans at 3H07A and 3H07B are within spec, and
    • ensure beam is stable (with all locks ON) at 0, 0mm before continuing.
    • Beam recovery procedure has more detailed procedure if needed.
  • New beam positions have been verified and established to be (0,0) mm for all targets.
    • Monitor that beam is at (0,0) using the stripchart on the Wall screen and verify no scraping on the glass cells using the Analysis monitor.
  • Check the position locks are on.
  • Check that CODA is running normally (had one strange hangup lately)
  • Check online replays shortly after starting runs, & full replay results too.
  • Fill BTA with realistic numbers. You may follow the guidance coming from "load from EPICS", if it does not overestimate the ABU (as it generally does). https://logbooks.jlab.org/entry/3783171. If we have to lower the beam current we actually want because the beam is too unstable, prorate the ABUs.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!                                                     !!
!!  ATTN: SHIFT LEADERS                                !!
!!     Please follow the shift summary template on     !!
!!     the laminated SL instructions.                  !!
!!                                                     !!
!!  ATTN: TARGET OPERATORS                             !!
!!  All NMR measurement HCLOG entries should include:  !!
!!     1) A title that clearly lists polarization      !!
!!     2) Screenshots of both NMR_FieldSweep and       !!
!!        the polarization fit                         !!
!!                                                     !!
!!     For an example see the following entry:         !!
!!     https://logbooks.jlab.org/entry/3768696       !!
!!                                                     !!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Notices in Effect for Shift Crew

  • Policy for CANS-related hall status change: Make a logbook entry when the hall goes in, or comes out of laser-controlled access.
  • Magnet policies
    • Follow the updated guidelines in the How-to#Spectrometer_Magnets Spectrometer Magnets How to
    • Spectrometer GUI (go_magnets) should always be visible on Shift Leader computer, hcdesk3
    • If any magnet trips, snapshot the associated power supply window and post it to hclog before resetting the interlock.
  • Monitor the beam position on target and call MCC immediately if you see large excursions (1 mm level).
  • When rotating the spectrometer, use HCCAM01 to keep an eye on the SOLID Cherenkov test stand when rotating SHMS (in addition to watching the live angle-cam image, etc). The updated rotation instructions are here: https://hallcweb.jlab.org/wiki/index.php/Spectrometer_Rotation#NOTICES_IN_EFFECT

Useful Links

PolHe3 Polarization Measurements

Misc Links

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