D-3He tokamak reactor with inductive a.c. and unidirectional current operation

We propose inductively operated D-3He tokamak reactors (R = 9.5 m, a = 2.8 and 3.2 m, Bt = 10 and 7.5 T, and Ip = 53.6 and 52.5 MA respectively) with an a.c. or unidirectional current (UDC) mode, operated in the first stability regime, with a small current drive power of about 500 kW in the plasma side, and about 2 MW in the transformer side. The high electron temperature Te (0) ∼ 62.5 keV together with a high bootstrap current fraction greater than 70% decreases the plasma resistance (to less than 1 nΩ) and the loop voltage (less than 10 mV range) and then prolongs the pulse length to more than 15 h. The ignition characteristics of a D-3He tokamak reactor are analyzed by the operation path method on the Pht τE2 −T plane and POPCON for different confinement scalings.