Four ignition TNS Tokamak reactor systems: Design summary

Principal TNS objectives assumed included: (1) demonstration of ignition and burning dynamics; and (2) reactor technology forcing. The selection of an overall design approach for TNS is described. The choice of ignition plasma design conditions (principally size and confining field of axis) and the choice of toroidal field coil technology (resistive or superconducting windings) are discussed. Four TF coil types were examined; these included copper, NbTi,Nb3Sn, and a hybrid design employing nested coils of copper and NbTi. The four reference concepts using decision modeling techniques as a mechanism for selecting a preferred design approach for the TNS mission are compared.