Hot-ion-mode ignition in a tokamak reactor

Presently observed scaling laws in tokamak experiments allow ignition of tokamak reactors with nre possibly as low as 4.5 × 10 13 cm −3 ·s. These reactors operate in the hot-ion ignition mode with T i >T e and are a direct extension of the hot-ion-mode operation observed in present tokamaks and expected in TFTR. They require MHD stability similar to conventional tokamak reactors and microstability at collision-ality ten times lower than that observed on PLT. All physics issues associated with hot-ion ignited reactors, short of complete ignition, can be addressed in existing facilities and TFTR.