Thursday, June 4, 2020 2pm ET

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Agenda

• Coil down-select (est. Aug. 28, 2020)
  • Physics summary document
    • all simulations completed
  • Pugh matrix for eng. factors, cost and schedule
  • Change control board
    • review Ruben's recommendation
    • make a decision
• Design and alignment tolerances
  • worst-case scenarios are tolerable
  • independent of the coil type (seg. vs. hyb.)
  • Recommendation should be closed - the method is developed
  • single coil offset studies still planned
• Overall tolerance document (in progress)
  • some sims needed to clarify items in document
  • will present at a later meeting
• Doses on coils/epoxy/braces
  • preliminary study done a couple years ago
  • repeated with updated exp. geometry
    • still rough (but conservative) on order of 100 MGy
• Stray field study related recommendations
  • Develop a magnetic measurement plan
  • Evaluate need for full field map
  • Tolerances for alignment should include clean transport of beam
• Magnet maximum current specification
  • Design vs. operational limit
  • design current is 20% above operating current for 11 GeV beam at nominal temperature
  • matters for specification of KPP (key performance parameters)
• Other business
• Next meeting

Thanks,

Minutes

Attendance: Ruben, Probir, Dave K., Dave F., Randy, Roger, KK, Chandan, Robin, Jay, Renuka, Sandesh, Juliette, Jim

• Coil down-select (est. Aug. 28, 2020)
  • coil stresses
  • clearances
  • coil support design
  • coil adjustments
    • Q: Preserve capability as long as possible (max. degrees of freedom)
  • Local lead effects
  • clearances between coils and envelopes
• Design and alignment tolerances
  • Physics (okay)
  • Doses
  • Clean transport of beam
  • Interference with the actual accepted envelopes
• Overall tolerance document (in progress)
• Doses on coils/epoxy/braces
• Stray field study related recommendations
  • measure the field in the bore
    • what kind of tech is needed, how small of a field can we measure
    • rotating coil - a tube slightly smaller than the bore - instrumented at different radii
    • have a magnet measurement task group
    • probably no difference for the segmented vs. hybrid
    • g-2 pdf
• Magnet maximum current specification
  • Design current 10% above operating current
  • threshold is 87% of 110% of design current (for 11 GeV)
  • student running sims
• Other business
  • Envelopes (Chandan)
  • Test the simulations
• Next meeting -

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