Anomalous Plasma Transport in the Stochastic Magnetic Field

Abstract

The anomalous transport of a high temperature plasma in the region of stochastic magnetic field is studied. Toroidal plasmas, such as tokamak's, are considered. Using the kinetic equation for plasma particles in the stochastic magnetic field, the plasma transport matrix in the stochastic region is formulated. A quasilinear approximation for the diffusivity of the magnetic field line D_M is used. The shifted Maxwellian which includes the mean velocity and the self-consistent electric potential is assumed. By use of this transport matrix the radial electric field formation, which is generated by ambipolar condition, and the associated temperature distribution in the stochastic region is obtained. The temperature distribution in the stochastic region becomes flat because of the rapid temperature diffusion. The radial electric field is formed in the stochastic region and its magnitude is found to depend on the value of D_M, and on the conditions of the heat fluxes and temperature gradients of electrons and ions in the nonstochastic region