Patent Number: 047740485
Section: claims

1. In a tokamak reactor including a vacuum vessel, toroidal confining magnetic field coils disposed concentrically around the minor radius of said vacuum vessel, and poloidal confining magnetic field coils, an ohmic heating coil system comprising at least one magnetic coil disposed concentrically around a toroidal field coil, wherein said magnetic coil is wound around said toroidal field coil such that said ohmic heating coil encloses said toroidal field coil. 2. The ohmic heating coil system of claim 1 comprising a plurality of said ohmic heating coils. 3. In a tokamak reactor including a vacuum vessel, toroidal confining magnetic field coils disposed concentrically around the minor radius of said vacuum vessel, and poloidal confining magnetic field coils, an ohmic heating coil system comprising at least one magnetic coil disposed concentrically around a toroidal field coil, wherein said magnetic coil is disposed around the outer perimeter of said toroidal field coil and wherein said toroidal field coil is D-shaped and said magnetic coil is horseshoe-shaped, the opening in said horseshoe-shaped coil being aligned with the first portion of said D-shaped toroidal field coil. 4. An interlocking tokamak reactor module comprising: a toroidal vacuum vessel section;  at least one toroidal field coil disposed concentrically around the minor radius of said vacuum vessel section;  modular saddle coil means for generating a poloidal confining magnetic field, said saddle coil means disposed circumferentially around the major radius of said toroidal vacuum vessel section and encircling said toroidal field coil about the major radius of said toroidal field coil; and  modular ohmic heating coil means.  a plurality of interlocking modules, said modules including a toroidal vacuum vessel section; at least one toroidal field coil disposed concentrically around the minor radius of said vacuum vessel section; modular saddle coil means for generating a poloidal confining magnetic field, said saddle coil means disposed circumferentially around the major radius of said toroidal vacuum vessel section and encircling said toroidal field coil about the major radius of said toroidal field coil; and  at least one modular ohmic heating coil, said ohmic heating coil including a magnetic coil having the same general shape and concentrically disposed around a toroidal field coil. 5. The tokamak module of claim 4 wherein said modular ohmic heating coil means comprises an ohmic heating coil having the same general shape as said toroidal field coil and disposed concentrically around said toroidal field coil. 6. The tokamak module of claim 5 wherein said ohmic heating coil is disposed around the outer perimeter of said toroidal field coil. 7. The tokamak module of claim 5 wherein said ohmic heating coil is wound around said toroidal field coil such that said ohmic heating coil encloses said toroidal field coil. 8. The tokamak module of claim 7 wherein said toroidal field coil is D-shaped. 9. The tokamak module of claim 8 wherein said saddle coil means comprises a first set of saddle coils operatively positioned to generate an equilibrium magnetic field and a second set of saddle coils operatively positioned to generate a divertor magnetic field. 10. A tokamak reactor system comprising: 11. The system of claim 10 wherein said toroidal field coil is D-shaped and said ohmic heating coil is disposed around the outer perimeter of a toroidal field coil. 12. The tokamak reactor system of claim 11 wherein said ohmic heating coil is horseshoe-shaped, the opening in said ohmic heating coil being aligned with the flat portion of said D-shaped toroidal field coil. 13. The tokamak reactor system of claim 11 comprising a plurality of said ohmic heating coils. 14. The tokamak reactor system of claim 1 wherein said modules include a plurality of toroidal field coils and a plurality of ohmic heating coils and wherein said ohmic heating coils are wound around said toroidal field coils, such that said ohmic heating coils enclose said toroidal field coils. 15. The tokamak reactor system of claim 14 wherein said toroidal coils are D-shaped. 16. The tokamak reactor system of claim 15 wherein said saddle coil means comprise a first set of saddle coils operatively positioned to generate an equilibrium magnetic field, and a second set of saddle coils operatively positioned to generate a divertor magnetic field. 17. The tokamak reactor system of claim 1 further comprising a trimming coil, said trimming coil comprising a conducting ring disposed around the outer circumference of said toroidal field coils