http://arxiv.org/abs/1707.08058
Understanding stochastic diffusion of energetic charged particles in non-uniform background magnetic field is one of the major problems in plasmas of space and fusion devices. In this paper by using the improved perturbation method developed by He \& Schlickeiser starting from the modified Fokker-Planck equation of energetic charged particles we derive an differential equation for isotropic distribution function with infinite iteration of anisotropic distribution function $g(\mu)$. And then new perpendicular and parallel diffusion coefficients are obtained which include the infinite iteration effect. It is demonstrated that the form of perpendicular diffusion coefficient is invariable with the iterations, but the parallel diffusion coefficient is modified by iterations. We also find that the parallel diffusion coefficient derived in some previous papers is the special case of which is derived in this paper.
J. Wang and G. Qin
Wed, 26 Jul 17
61/68
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