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Physics of Plasmas / Volume 1 / Issue 7
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Phys. Plasmas 1, 2229 (1994); http://dx.doi.org/10.1063/1.870934 (16 pages)

Toroidal gyro‐Landau fluid model turbulence simulations in a nonlinear ballooning mode representation with radial modes

R. E. Waltz1, G. D. Kerbel2, and J. Milovich2

1General Atomics, P.O. Box 85608, San Diego, California 92186‐9784
2NERSC at Lawrence Livermore National Laboratory, Livermore, California

(Received 7 February 1994; accepted 7 April 1994)

The method of Hammett and Perkins [Phys. Rev. Lett. 64, 3019 (1990)] to model Landau damping has been recently applied to the moments of the gyrokinetic equation with curvature drift by Waltz, Dominguez, and Hammett [Phys. Fluids B 4, 3138 (1992)]. The higher moments are truncated in terms of the lower moments (density, parallel velocity, and parallel and perpendicular pressure) by modeling the deviation from a perturbed Maxwellian to fit the kinetic response function at all values of the kinetic parameters: k∥vth/ω, b=(k⊥ρ)2/2, and ωD/ω. Here the resulting gyro‐Landau fluid equations are applied to the simulation of ion temperature gradient (ITG) mode turbulence in toroidal geometry using a novel three‐dimensional (3‐D) nonlinear ballooning mode representation. The representation is a Fourier transform of a field line following basis (ky′,kx′,z′) with periodicity in toroidal and poloidal angles. Particular emphasis is given to the role of nonlinearly generated n=0 (ky′ = 0, kx′ ≠ 0) ‘‘radial modes’’ in stabilizing the transport from the finite‐n ITG ballooning modes. Detailing the parametric dependence of toroidal ITG turbulence is a key result.

KEYWORDS and PACS

Keywords

FLUID MODELS, TOKAMAK DEVICES, TURBULENCE, PLASMA DRIFT, KINETIC EQUATIONS, BALLOONING INSTABILITY, ION TEMPERATURE, TRANSPORT THEORY, HELICITY, FOURIER ANALYSIS, PLASMA SIMULATION

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.870934

PUBLICATION DATA

ISSN

1070-664X (print)  
1089-7674 (online)

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