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ARIES-AT Toroidal Field (TF) and Poloidal Field (PF) Coils

ARIES-AT Toroidal Field (TF) and Poloidal Field (PF) Coils. Tom Brown, Fred Dahlgren, Phil Heitzenroeder (PPPL) September 18, 2000. ARIES AT TF and PF Design. The ARIES AT TF and PF systems are based on YBCO high temperature SC.

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ARIES-AT Toroidal Field (TF) and Poloidal Field (PF) Coils

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  1. ARIES-AT Toroidal Field (TF) and Poloidal Field (PF) Coils Tom Brown, Fred Dahlgren, Phil Heitzenroeder (PPPL) September 18, 2000 ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  2. ARIES AT TF and PF Design • The ARIES AT TF and PF systems are based on YBCO high temperature SC. • The coil configuration permits full replacement of the blanket/shield modules. • Design is based on Ron Miller’s strawman ver. 306 & Chuck Kessel’s optimized PF system. ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  3. ARIES-AT Configuration Features • High T SC TF • No structure between TF outer legs: • Permits blanket/shield/ divertor module removal. ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  4. Mechanical Arrangement PF coils Solenoid TF case Double Pan. TF Winding VV Blanket/Shield/PFC Module ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  5. TF Inboard/Outboard Case Detail 5 cm inner case added to TF structure Case structure built up to increase out-of plane stiffness ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  6. Inboard Radial Build • 5 cm inner shell added to TF inboard leg • VV inner radii set at 2.83 m per strawman (ver 306) • Details of the VV, blanket/shield and div module has not been updated in the TF Pro/E models ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  7. Configuration Details ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  8. Intercoil Structure Stiffening ribs TF System • 16 coils • B0=5.9 T @R0=5.20 m • 9.6 Mat / coil • 2400 T/coil; double pancakes • Wedged support • YBCO Hi T S/C @75K on Inconel strip • Bmax @ S/C=11.1 T • Wound construction • Permits grading; easier fabrication; better field orientation for higher J ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  9. TF Coil Case & Lead Details • One coil case (shown) is configured for power leads. • The other 15 coils are configured for coil to coil connections. Leads ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  10. TF Coil to Coil Bus Connections Coil-coil connection details Input lead details ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  11. Exploded View of Case Assembly Total Weight of a Single TF coil is 64 metric tons ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  12. TF Coil Winding • Double pancakes will be wound into the coil case channel via two spools which are sized to limit conductor strain to <0.2%. ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  13. TF Superconductor YBCO Superconductor Strip Packs (20 layers each) CeO2 + YSZ insulating coating (on slot & between YBCO layers) 8.5 mm Inconel strip 430 mm • 2 pancakes per coil; 20 turns per pancake • Each turn has 20 x 3 “sub turns” for a total of 2400 turns/coil. • I / sub turn = 9600 kAt/2400 t = 4 kA • Jsc=100 kA/sq. cm (10 micron thick film layer assumed). Strain limit 0.2%. • Superconductor is conduction cooled by case; case is cooled by LN2. ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  14. Total Field at TF Conductor ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  15. Radial Field at TF Conductor Worst Case field perpendicular to SC in Inner leg : Bmax ~ 2.288 T @ BT=11.1T ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  16. Vertical Field at TF Conductor Worst Case Field perpendicular to sc in horizontal leg region: ~Bmax ~5.4 T @ JT=100kA/sq.cm ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  17. Bromberg and Tekula, “Options for the Use of High Temperature Superconductor in Tokamak Fusion Reactor Design” Jallow., TF=100 kA/sq. cm Max. B-perp. For TF at 75K ~3.8 T Bmax., TF Conductor Operating Point Max. B-perp. For PF at 75K ~6 T (@50kA/sq.cm.) ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  18. TF Load Patterns Out of Plane In Plane ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  19. Nastran TF Coil/Case Model (reinforced) Increased Outer Case Radial Depth (950mm) Added inner Case Wall (100mm) Increased Case Wall Thickness (160mm) ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  20. Vertical TF Displacements due to Combined Loading (preliminary model) ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  21. TF Displacements due to Combined Loading ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  22. Coil Strain Due to Combined Loading(maximum principal - preliminary model) Max.Pr..Strain 7.7% ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  23. Coil Strain due to Combined Loading (MaxPrinc.) w/Reinforced Case ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  24. In Plane + Out of Plane Max. Pr. Stress ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  25. In Plane + Out of Plane Tresca Stress On the Case -w/Reinforced Case. ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  26. Poloidal Field System 9 10 11 12 8 13 14 OH ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  27. Poloidal Field Coil Design LN2 chill plates (option: pool boiling design) • Uses YBCO / Inconel conductor similar to the TF. • J =55 kA / sq. cm “N” subturns of YBCO superconducting strip per slot. N varies with coil I requirements Gl-Polyimide Electrical Insulation Inconel strip ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  28. PF - Radial Fields Peak Radial Field is only 7.7 T for PF 12 & 13 and 5.9 T @ the conductor. Peak Radial Field 9.0 T Need to re-orient the conductor plane to horizontal. Peak Vertical Field is 8.7 T for PF-14 and 6.9 T @ the conductor. We will need to reduce the current Density in PF-14. ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  29. PF - Vertical Fields PF-12 PF-13 Peak Vertical Field 9.3 T Peak Radial Field is only 7.7 T for PF 12 & 13 and 5.9 T @ the conductor. PF-14 ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  30. Alternate PF Coil Orientation • The maximum PF-14 normal field component will be 7 Tesla, @J = 30kA/sq.cm ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

  31. PF Coil Supports & Stresses • Stresses are OK: s allowable is ~600 MPa. based on 0.2% strain limit of SC , • We still have to update drawings to coil & support dimensions used in analyses. ARIES AT Project Meeting - Princeton, NJ 18 Sept 00

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