Neoclassical equilibrium in gyrokinetic simulations

Journal Article · Mon Jun 15 00:00:00 EDT 2009 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3153328· OSTI ID:21277232

Garbet, X; Dif-Pradalier, G; Nguyen, C; Sarazin, Y; Grandgirard, V; Ghendrih, Ph ^[1]

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1. CEA, IRFM, F-13108 St. Paul-lez-Durance Cedex (France)

This paper presents a set of model collision operators, which reproduce the neoclassical equilibrium and comply with the constraints of a full-f global gyrokinetic code. The assessment of these operators is based on an entropy variational principle, which allows one to perform a fast calculation of the neoclassical diffusivity and poloidal velocity. It is shown that the force balance equation is recovered at lowest order in the expansion parameter, the normalized gyroradius, hence allowing one to calculate correctly the radial electric field. Also, the conventional neoclassical transport and the poloidal velocity are reproduced in the plateau and banana regimes. The advantages and drawbacks of the various model operators are discussed in view of the requirements for neoclassical and turbulent transport.

• OSTI ID: 21277232
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 16; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BANANA REGIME
COLLISIONS
ENTROPY
EQUILIBRIUM
NEOCLASSICAL TRANSPORT THEORY
PLASMA
PLASMA SIMULATION
TURBULENCE
VARIATIONAL METHODS