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A theory of non-local linear drift wave transport

Sara Moradi (Institutionen för teknisk fysik, Nukleär teknik) ; Johan Anderson (Institutionen för teknisk fysik, Nukleär teknik) ; Boris Weyssow
Physics of Plasmas (1070-664X). Vol. 18 (2011), 6, p. 062106.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: dispersion relations, Fokker-Planck equation, Maxwell equations, plasma drift waves, plasma toroidal confinement, plasma transport processes, plasma turbulence, tokamak devices

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Denna post skapades 2011-06-24. Senast ändrad 2016-10-18.
CPL Pubid: 142392


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Institutioner (Chalmers)

Institutionen för teknisk fysik, Nukleär teknik (2006-2015)


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Chalmers infrastruktur