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Focussing Absorber Magnet

Focussing Absorber Magnet. Elwyn Baynham ; Tom Bradshaw Iouri Ivaniouchenkov ; Jim Rochford Applied Science Division Rutherford Appleton Laboratory. Scope of Presentation. Scope Magnetic Modelling Conductor specification Force reaction Cooling Integration with absorber

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Focussing Absorber Magnet

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  1. Focussing Absorber Magnet Elwyn Baynham ; Tom Bradshaw Iouri Ivaniouchenkov ; Jim Rochford Applied Science Division Rutherford Appleton Laboratory Elwyn Baynham RAL

  2. Scope of Presentation • Scope • Magnetic Modelling • Conductor specification • Force reaction • Cooling • Integration with absorber • Manufacturing routes Elwyn Baynham RAL

  3. Solenoid absorber assembly Elwyn Baynham RAL

  4. Design Parameters Elwyn Baynham RAL

  5. Opera3d model Coil Pair at Z= 0 (mm) Radial cross section 255 to 336 (mm) Axial cross section 125 to 342 (mm) Current Density: +/-105.88 (A/mm2) Total current: 1.86E+06 (A) Peak fields 6.04T Stored energy 2 Mj Design Parameters Elwyn Baynham RAL

  6. Magnetic Modelling • Aspects modelled • Field Profiles • Peak Fields • Forces • Stored Energy/Inductance matrix Elwyn Baynham RAL

  7. Field Profile • Field Profile for central focusing pair Elwyn Baynham RAL

  8. Peak Field Profile • Peak Field Map Elwyn Baynham RAL

  9. Forces • Forces Elwyn Baynham RAL

  10. Stresses • Hoop stresses Elwyn Baynham RAL

  11. Stored Energy Computation • Stored Energy /Inductances Elwyn Baynham RAL

  12. Protection Philosophy • Powering • 3 sets of focus coils to be powered in series • one pair of leads for each coil to allow field trimming • Protection • by resistor/diode bypass of each coil • energy dumped/coil is self energy • coupled energy is relatively small • no active protection is seen as necessary • modelling is not yet done Elwyn Baynham RAL

  13. Conductor Specification/Op margins Elwyn Baynham RAL

  14. Cooling principles • Proposed cooling mode • 2-phase circulation in pipes - pumped • Established for detector magnets • Generally high stability – pure aluminium • Large deltaT > 2K • Advantages • No helium vessel • Small helium inventory – single magnet <10 litres • Disadvantages • Require some deltaP/deltaT for circulation – 0.2-0.3K • Transient stability is the same as a bath Elwyn Baynham RAL

  15. Cooling - force transfer principles • Cooling-force transfer in cold mass Elwyn Baynham RAL

  16. External axial force restraint Between cryostats Internal axial force restraint Suspension Internal force restraint 75T 225T 150T LH Force Transfer to the cryostat • Schematic of force control Elwyn Baynham RAL

  17. Integration and assembly • Principles • Solenoid cold mass main structural element • cooled to 4K by 2 phase He • supported from vessel low heat leak supports • able to be pre-tested as a separate unit • H2 Absorber mechanically mounted from the solenoid cold mass • thermally isolating - G10 • cooled by 14-18K He gas • Modular design and assembly Elwyn Baynham RAL

  18. Design and Manufacture • Design • design of magnet coils and H2 absorber must be integrated with design of cryostat • Manufacture • the coils are industry standard in terms of conductor/size/stored energy • key issue is cooling and force constraint • field shape gives shear forces in coils • margin of 1.5K is adequate for this type of magnet • operation at the 20% higher field will depend on quality of force support Elwyn Baynham RAL

  19. Solenoid absorber assembly Elwyn Baynham RAL

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