A four-dimensional plasma model able to describe the scrape-off layer region of tokamak devices at arbitrary collisionality is derived in the drift-reduced limit. The basis of the model is provided by a drift-kinetic equation that retains the full nonlinear Coulomb collision operator and describes arbitrarily far from equilibrium distribution functions. By expanding the dependence of the distribution function over the perpendicular velocity in a Laguerre polynomial basis and integrating over the perpendicular velocity, a set of four-dimensional moment equations for the expansion coefficients of the distribution function is obtained. The Coulomb collision operator as well as Poisson's equation are evaluated explicitly in terms of perpendicular velocity moments of the distribution function.
Four-dimensional drift-kinetic model for scrape-off layer plasmas
Present address: Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742, USA.
Note: This paper is part of the Special Collection: Papers from the 61st Annual Meeting of the APS Division of Plasma Physics.
Note: Paper GI2 3, Bull. Am. Phys. Soc. 64 (2019).
L. M. Perrone, R. Jorge, P. Ricci; Four-dimensional drift-kinetic model for scrape-off layer plasmas. Phys. Plasmas 1 November 2020; 27 (11): 112502. https://doi.org/10.1063/5.0024968
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