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Muon Collider Ring Dipole: Status of Magnetic & Mechanical Analysis Alexander Zlobin

Muon Collider Ring Dipole: Status of Magnetic & Mechanical Analysis Alexander Zlobin. MC Ring Magnet Requirements. Nominal field: 10 T Operation temperature: 4.5 K Operation margin: 10%+ (will know better from modeling) Aperture: ID~20 mm Midplane gap: ~20 mm on one side

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Muon Collider Ring Dipole: Status of Magnetic & Mechanical Analysis Alexander Zlobin

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  1. Muon Collider Ring Dipole:Status of Magnetic & Mechanical AnalysisAlexander Zlobin

  2. MC Ring Magnet Requirements • Nominal field: 10 T • Operation temperature: 4.5 K • Operation margin: 10%+ (will know better from modeling) • Aperture: ID~20 mm • Midplane gap: ~20 mm on one side • Field quality: dB/B~10^-4 Rref=10 mm • Short ends • Magnet length: ?

  3. MC Ring Dipole: Shell-type coil • Original magnetic design (VadimKashikhin): • 2 double-layer shell-type coils with spacers • Good field quality in the aperture ~50mm • Bop~10T with ~15% margin at 4.5K. • Midplane gap: 20 mm

  4. Mechanical Design Concept • Compact cold mass with Aluminum shell • Warm iron yoke • 10 mm Al support spacer in the gap • Absorber outside the cold mass at 77K or 300 K

  5. Mechanical Analysis Igor Novitski • Large structure deformations, gaps • Large coil deformations and stress concentrations • Problems with stress management with shell-type coils • Iron yoke support • Coil midplane support Optimization of this approach needs more work Stress and deformations

  6. MC Ring Dipole: Block-type coil Cold iron yoke RFe=125 mm, mu=2 • 2 double-pancake coils with stress management, cold yoke • Aperture/open gap =20 mm • Good field quality 40mmx20mm • Bnom=10 T with ~10% margin at 4.5 K

  7. Field Distribution • Bmax_coil=13.37 T (block #1) • Bmax_ap=11.24 T • Operation margin ~12%

  8. Mechanical Design • Cold yoke with vertical split • Holes for absorber inside cold mass • SS shell

  9. Mechanical Analysis Igor Novitski Structure deformation

  10. Coil Stress and Deformation Igor Novitski Coil stress Coil deformation

  11. Next Steps • Continue mechanical and magnetic design optimization • Include coil pre-stress and cool-down • Reduce coil deformations and stress • Increase operation margin • Coil cooling and quench protection concepts • Prepare for engineering design and modeling • Field quality requirements • Effect of mid-plane support (size, position, material) on coil heating and cryogenic load

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