Magnet system for catalyzed D-D and D-He3 reactors

A new concept for toroidal field magnets, called the DEALS (Demountable Externally Anchored Low Stress) magnet systems, has been conceived and developed for advanced fuel reactors. This concept should result in substantial cost reductions for toroidal magnets. In addition, the conductor stress is relatively low and compressive in nature, which is very important if brittle Nb3Sn conductors are to be successfully used, since advanced fuel Tokamak reactors require Nb3Sn conductor if reasonable power densities are to be achieved. A final very important benefit of the DEALS magnet system is demountability. Failed magnet segments can probably be replaced fairly rapidly (i.e., in approximately a month) without requiring movement and/or dissassembly of the blanket/shield regions and poloidal coils. Due to the high degree of non-circularity present in the plasmas of the low-β Tokamak reactor designs which are detailed in this report, a system of poloidal field coils is necessitated to provide both shape and positional stability. In addition, the uncertainty regarding the accessibility of the high-β regimes discussed may also necessitate extensive poloidal field systems. Volt second requirements are such that they must be alleviated also by this poloidal field system