A theory of non-local linear drift wave transport
Artikel i vetenskaplig tidskrift, 2011

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.

plasma toroidal confinement

dispersion relations

Fokker-Planck equation

plasma turbulence

plasma drift waves

plasma transport processes

Maxwell equations

tokamak devices


Sara Moradi

Chalmers, Teknisk fysik, Nukleär teknik

Johan Anderson

Chalmers, Teknisk fysik, Nukleär teknik

B Weyssov

Physics of Plasmas

1070-664X (ISSN) 1089-7674 (eISSN)

Vol. 18 6 062106- 062106


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Fusion, plasma och rymdfysik