A theory of non-local linear drift wave transport
Abstract
Transport events in turbulent tokamak plasmas often exhibit non-local or non-diffusive action at a distance features that so far have eluded a conclusive theoretical description. In this paper a theory of non-local transport is investigated through a Fokker-Planck equation with fractional velocity derivatives. A dispersion relation for density gradient driven linear drift modes is derived including the effects of the fractional velocity derivative in the Fokker-Planck equation. It is found that a small deviation (a few percent) from the Maxwellian distribution function alters the dispersion relation such that the growth rates are substantially increased and thereby may cause enhanced levels of transport.
Keywords
Cite
@article{arxiv.1103.2867,
title = {A theory of non-local linear drift wave transport},
author = {S. Moradi and J. Anderson and B. Weyssow},
journal= {arXiv preprint arXiv:1103.2867},
year = {2015}
}
Comments
22 pages, 2 figures. Manuscript submitted to Physics of Plasmas