AbstractThe FIRE tokamak is an option for the next step in the U.S. magnetic fusion energy program. The design goals have evolved to a major radius of 2.14 m, minor radius of 0.525 m, toroidal field (TF) of 10 T and plasma current of 7.7 mA for a flat-top time of ∼20 s. The requirement for 3000 full-power, full-field pulses and 30,000 pulses at 2/3 of full field has been retained since 1999. All magnets are inertially cooled with liquid nitrogen. Design options have been considered over a range of parameter space for either a wedged TF coil structure or a bucked and wedged TF/Central Solenoid structure. The wedged configuration has been selected as the baseline.