ISOTOPIC SCALING OF TRANSPORT IN DEUTERIUM-TRITIUM PLASMAS

Both global and thermal energy confinement improve in high-temperature supershot plasmas in the Tokamak Fusion Test Reactor (TFTR) when deut erium beam heating is partially or wholly replaced by tritium beam hea ting. For the same heating power, the tritium-rich plasmas obtain up t o 22% higher total energy, 30% higher thermal ion energy, and 20-25% h igher central ion temperature. Kinetic analysis of the temperature and density profiles indicates a favorable isotopic scaling of ion heat t ransport and electron particle transport, with tau(Ei)(a/2) proportion al to [A](0.7-0.8) and tau(pe)(a) proportional to [A](0.8).