Quasi-linear transport of alpha-particles in a tokamak plasma

Based on the general formulation of the anomalous transport, the qualitative features of the transport of the fusion α-particles, electrons and ions induced by the thermonuclear drift instability of Alfven waves in a tokamak plasma are discussed in terms of the turbulent spectrum. For the drift instability considered by Mikhailovskii, estimates of the anomalous particle flux are obtained, the coefficient of turbulent diffusion being as large as one tenth of the Bohm diffusion coefficient for a wave energy density as low as a few 10-4 of the α-particle energy density. On the other hand, it is found that the anomalous energy transfer from the α-particles might still be somewhat faster than α-particle transport