ON THE OPERATION CYCLE OF TOKAMAK FUSION-REACTORS

Regimes of tokamak operation more favourable to either inductive or no n-inductive current drive are discussed. Steady-state operation, while desirable, appears to be limited to 'advanced' operation regimes. Non -inductive and inductive current drive are shown for 'conventional', h igh current, and 'advanced', low current, concepts. Thermal energy sto rage and augmentation systems suitable for pulsed systems are shown, a nd the issues of stress and thermal cycling are introduced. The advanc es in physics that may lead to attractive steady-state concepts, are s hown also to lead to attractive pulsed concepts-