Kinetic Effects on the Convective Plasma Diffusion and the Heat Transport

概要

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Cross field heat and particle transport due to the thermally excited convective cell mode is investigated both by theoretical work and by particle simulations. It is shown that there is a parameter range where the heat diffusion coefficient D_H (∂T/∂t=D_H∂^2T/∂x^2,T is the temperature) is considerably less than the particle diffusion coefficient D_p(D_p=<lim>___<t→∞<(Δr)^2>/2t). This comes from the fact that high energy particles in a velocity distribution diffuse much more slowly than the low energy particles because the fluctuating electric fields are averaged out over their finite Larmor radii. A velocity dependent diffusion coefficient D(v) is obtained by a simple theory together with an estimate of D_H. Good agreement with the simulation results is obtained. The magnetic field scaling of D_H/D_p is also discussed. The results imply that ions in a thermonuclear reactor should be less affected by turbulence than are electrons as appears to be the case.
核融合科学研究所の論文