Friday, October 23, 2020 1pm ET

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Agenda

• status of segmented vs. hybrid downselect
• CTD450 summary
• optimization of the upstream collimator region
  • merging - Chandan
  • shielding - Naz
• nomenclature

Minutes

Attendance:

• status of segmented vs. hybrid downselect
  • meet with change control board just before Christmas (Dec. 15)
    • downselect by end of November
    • couple page report, Pugh matrix
    • prioritize what is important for the downselect
  • issues
    • coil forces
    • blocky models for upstream and several for segmented ds
      • improved winding design for US (more realistic, with leads)
      • second blocky for the US torus (b/c exceeded J) w/ 6 turns
  • section views down the length with clearances
    • when will need new envelopes (what is the turnaround time?)
    • clearances with current envelopes are good enough for hybrid vs. segmented downselect
• CTD450 summary
  • CTD 403 - literature search - best resin (cyanate esther) to use
  • conductor half-lapped with S- or E- glass cloth (probably S, b/c better with CTD403)
  • tests on short-beam shear stress at CERN (but at 4K)
  • what about 70 degrees?
  • primed with CTD 450 - stronger initially
  • the stresses are ~11 MPa (during curing and cool-down)
  • thermal stresses during operation ~5 MPa
  • stresses at corners ~25 MPa
  • primed w/ CTD 450 (assuming 15% reduction in strength) is 61 MPa final shear strength
  • can we do stress tests with thermal cycling and dose?
  • need to make sure we have checked with worst-case offsets (I think we have)
  • 70 C, vacuum pumping, irradiation - trying our best to destroy it!
  • physicists will read the dose/strength papers
• optimization of the upstream collimator region
  • merging - Chandan (not here)
  • shielding - Naz
• nomenclature

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