DIFFUSION OF CHARGED-PARTICLES IN THE LARGE-SCALE STOCHASTIC MAGNETIC-FIELD

Diffusion of teft charged particles in turbulent plasma is analyzed. In plasma there are a regular quasi-homogeneous magnetic field B0 and large-scale stochastic fluctuations of magnetic field B approximately and medium velocity u, satisfying the equations of magnetic hydrodynamics. The characteristic scales of the velocity and field fluctuations exceed the local mean path of probe particles. Averaging the drift kinetic equation for the particle distribution function is performed over the realization ensemble of statistically homogeneous and isotropic fluctuations of the magnetic field and over the velocity of medium without any assumption of the amplitude smallness. In order to calculate the averaged tensor of diffusion, the renormalization method is used. The method yields the set of transcendental equations for the diffusion tensor components, allowing the analytical investigation and numerical calculation. The simple analytical expressions describing the regimes of the particle diffusion across the regular magnetic field are found.