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 deuterium beam heating is partially or wholly replaced by tritium beam heating. For the same heating power, the tritium-rich plasmas obtain up to 22% higher total energy, 30% higher thermal ion energy, and 20-25% higher central ion temperature. Kinetic analysis of the temperature and density profiles indicates a favorable isotopic scaling of ion heat transport and electron particle transport, with τ Ei ( a /2) ∝ ⟨ A ⟩ 0.7-0.8 and τ pe ( a ) ∝ ⟨ A ⟩ 0.8 .