Test particle transport in a plasma with electrostatic turbulence

In this work, the motion of test particles (TP) in two-dimensional turbulence is studied by means of direct numerical simulations. Although the original motivation is the study of impurity transport in electrostatic turbulence, the scope of the work is much wider, being of immediate interest in other branches of applied physics. In addition, the question of the dependence of two-dimensional passive advection on the statistical features of the underlying turbulent field is, in its own, an important problem in turbulence theory. A primary goal of this type of investigations is indeed the assessment of various analytic expressions for the transport features (e.g., diffusivity) available in the literature. (author)