A theory of non-local linear drift wave transport

Details A theory of non-local linear drift wave transport A theory of non-local linear drift wave transport

2011-03-15

arxiv.org/abs/1103.2867v2

Physics of Plasmas 18, 062106 (2011)

Physics

Plasma Physics

22 pages, 2 figures. Manuscript submitted to Physics of Plasmas

Scientific paper

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.

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