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

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

ARIES AT Project Meeting - Princeton, NJ 18 Sept 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 Inboard Radial Build

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

ARIES AT Project Meeting - Princeton, NJ 18 Sept 00 8 TF System 16 coils B 0 =5.9 0 =5.20 m 9.6 Mat / coil 2400 T/coil; double pancakes Wedged support YBCO Hi T on Inconel strip B S/C=11.1 T Wound construction –Permits grading; easier fabrication; better field orientation for higher J Stiffening ribs Intercoil Structure

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 TF Coil to Coil Bus Connections Input lead details Coil-coil connection details

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

ARIES AT Project Meeting - Princeton, NJ 18 Sept 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 TF Superconductor 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 J sc =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. Inconel strip YBCO Superconductor Strip Packs (20 layers each) 8.5 mm CeO 2 + YSZ insulating coating (on slot & between YBCO layers) 430 mm

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

ARIES AT Project Meeting - Princeton, NJ 18 Sept Radial Field at TF Conductor Worst Case field perpendicular to SC in Inner leg : B max ~ B T =11.1T

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

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

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

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

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

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

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

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

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

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

ARIES AT Project Meeting - Princeton, NJ 18 Sept Poloidal Field System OH

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

ARIES AT Project Meeting - Princeton, NJ 18 Sept PF - Radial Fields 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 the conductor. We will need to reduce the current Density in PF-14. Peak Radial Field is only 7.7 T for PF 12 & 13 and 5.9 the conductor.

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

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

ARIES AT Project Meeting - Princeton, NJ 18 Sept PF Coil Supports & Stresses Stresses are OK:  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.