PolHe3 Target Coil Rotation Plan, Mar 2020

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Target coil rotation planned for March 13--20

  • Nominal 1-week downtime in Hall C to rotate target coils, install new cell, and transition to d2n program

Bullet point Plan

  • Friday, March 13
    • Techs load up hardware for Hall in ESB in the morning
      • Locate the extra beamline windows
      • Optics table for Compass measurements
      • Field measurement jig?
      • Parasitic Cerenkov test hardware/stand
    • Beam off at 8am
    • Radcon Survey -- Move to Controlled Access
      • Prep to open the Enclosure
      • Laser controlled access
    • Final measurements on target cell (EPR, etc)
    • Plan for Hall to move to Restricted around 1pm
    • Work through remaining DAY, SWING
      • Bleed up beamlines *with N2* to allow up/downstream stubs to come off (Gaskell, Marble)
      • Put guards on HMS/SHMS windows
        • NOTE: Be beamline windows need to be protected from air (put in Rad bag and fill with dry nitrogen?)
      • Target Group work (with RadCon support -- RW-II environment!)
        • Remove target ladder/cell
        • Remove reference cell
        • RadCon remove their Contamination mitigation sheets
  • Saturday, March 14
    • Techs w/ Target group rotate the coils
  • Sunday, March 15
    • Complete rotation, recable where possible keeping in mind that we may need adjustments with Survey support on Monday
  • Monday, March 16
    • Survey and Alignment confirms target and beamline laser alignment
  • Tuesday--Wednesday, March 17, 18
    • Possible pointing Surveys for SHMS, HMS (TBD)
  • Thursday, March 19
    • Target optimization, Float
  • Friday, March 20
    • Deadline to start beam recovery to Hall

Drawings / Photos

Component/Hardware Status

  • Oven bottom plate (Arun/Bert)
    • Follow up with Vince Pope in Machine shop (Arun?)
  • Kepco power supply status (Bill/Todd?)
    • Bill will update us on Wed
    • We need to establish what target angles will be (remotely) accessible (90, 180, -90?, 0?)
  • Target cell Austin (Xiaochao?)
    • Only 'Reduced set' of density measurements available now, will continue measurements this week (issues with laser at UVa?)
    • Wall and window thicknesses done
    • It would be best for it to arrive at JLab on March 10 (at the latest) to allow locals to mount cell in oven plate before they get involved with target work in Hall.
  • Lots of preplanning to be completed (RadCon, Techs, S&A, Target group, etc)
    • Had job walkthrough meeting this (Monday) morning with the above parties -- so far, so good
    • Must coordinate Tech support with the parasitic test installation plans
  • RW-II training for JP, Arun, Brad, Bill
    • Test is taken, awaiting the practicum (RadCon)

Items that are declared ready

  • pNMR coil mount and wire for new cell
    • on table in EEL target lab (Mingyu)
  • spare convection heater strips
    • on table in EEL target lab (Mingyu)

Target Field Measurements

Main page is here: Pol_He3_Field_Mapping_Data (Field and Compass data)

Field Mapping from November

Compass Measurements

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