Numerical Investigation of Anomalous Diffusion in Nonuniform Plasma with Drift Waves

A study of possible mechanism of an anomalous transport is carried out using the analysis of the dynamics of particles interacting with drift wave fluctuations. Estimates of the diffusion coefficient are based on the calculations of particle orbits. In present work, estimations of anomalous diffusion/transport are based on detailed calculations of a particle motion a plasma. To use a such approach it is necessary to formulate special model of a non-stationary fields of an electrostatic/electromagnetic waves propagating in the plasma. The like approaches were discussed in Refs. [1, 2] for tokamak magnetic field. We consider a simple axisymmetric magnetic configuration (with magnetic field lines parallel to z-axis). The model under consideration takes into account only drift modes because drift waves are responsible for the anomalous transport [3]. In our model dispersion relations for the low-frequency drift (LFD) and lower hybrid drift (LHD) waves proceed from Refs. [46]. As parameters in dispersion relations depend on gradients of plasma density, plasma temperature, and magnetic field, we assume that plasma volume is divided on several layers transversally to gradients of the plasma parameters. In every layer gradients of corresponding parameters are supposed t