Magnetic diffusion models for FAST toroidal magnet coils

Abstract

FAST is a project of a compact high-field tokamak (up to 8.5 T) with copper coils ( either for toroidal and poloidal fields) operated at cryogenic temperatures (30 °K) to get a higher electrical conductivity of the copper and to permit an adiabatic duty cycle, i.e. the coils cooling is carried out between two consecutive pulses, to minimize the coils size.