Patent Number: 043702953
Section: claims

1. A fusion-fission reactor having a plasma containing toroidal fusion region for producing high energy neutrons from fusion reactions and a region external to said fusion region containing material which is both fissile with respect to high energy neutrons and fertile with respect to low energy neutrons, said reactor comprising: (a) An electromagnetic toroidal field generating means having inner and outer structural contours;  (b) a region of fissile-fertile material positioned within said inner and outer structural contours of said toroidal field generating means and constituting a portion thereof; and  (c) said toroidal field generating means positioned substantially adjacent said toroidal fusion region.  (a) positioning electromagnetic toroidal field generating means having inner and outer structural contours substantially adjacent said toroidal fusion region; and  (b) incorporating said fissile-fertile material within said inner and outer structural contours of said toroidal field generating means and within a portion thereof. 2. A fusion-fission reactor as recited in claim 1 further comprising moderator/reflector means positioned proximate said toroidal field generating means to moderate and reflect said high energy neutrons into said region of said fissile-fertile material. 3. A fusion-fission reactor as recited in claim 2 wherein said moderator/reflector means is positioned exterior of said toroidal field generating means. 4. A fusion-fission reactor as recited in claim 1 wherein said toroidal field generating means comprises a plurality of toroidal field coils forming a toroid about said toroidal fusion region and said fissile-fertile material is positioned within the region of said toroidal field coils and generally on the side away from a main axis of said toroidal fusion region. 5. A fusion-fission reactor as recited in claim 4 wherein said fissile-fertile material forms discrete regions within said plurality of toroidal field coils and extends from approximately an inner circumferential contour of said toroidal coils to approximately an outer circumferential contour thereof on the side generally away from the main axis of said toroidal fusion region. 6. A fusion-fission reactor as recited in claim 5 wherein said fissile-fertile material comprises U.sup.238. 7. A fusion-fission reactor as recited in claim 6 wherein said fusion region contains deuterium and tritium. 8. A fusion-fission reactor as recited in claim 5 wherein said fissile-fertile material comprises Th.sup.232. 9. A fusion-fission reactor as recited in claim 4 wherein said plurality of toroidal field coils form segments of said toroidal field generating means and said region of said fissile-fertile material comprises between 5% and 50% by volume of said segments. 10. A fusion-fission reactor as recited in claim 9 wherein said region of fissile-fertile material comprises approximately 20% by volume of said segments. 11. A fusion-fission reactor as recited in claim 9 wherein said regions of said material are positioned on opposite sides of each segment with a region of electrically conductive material disposed therebetween. 12. A method of increasing the efficiency of operation of a fusion-fission device having a plasma containing fusion region for generating high energy neutrons from fusion reactions and a region exterior to said fusion region containing material which is both fissile with respect to high energy neutrons and fertile with respect to low energy neutrons, comprising the steps of: