Commun. Comput. Phys.,
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Volume 4.


Gyrofluid Simulation of Ion-Scale Turbulence in Tokamak Plasmas

Jiquan Li 1*, Y. Kishimoto 2

1 Graduate School of Energy Science, Kyoto University, Uji, Kyoto 611-0011, Japan; Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou, China.
2 Graduate School of Energy Science, Kyoto University, Uji, Kyoto 611-0011, Japan.

Received 20 March 2008; Accepted (in revised version) 3 August 2008
Available online 9 September 2008

Abstract

An improved three-field gyrofluid model is proposed to numerically simulate ion-scale turbulence in tokamak plasmas, which includes the nonlinear evolution of perturbed electrostatic potential, parallel ion velocity and ion pressure with adiabatic electron response. It is benchmarked through advancing a gyrofluid toroidal global (GFT_G) code as well as the local version (GFT_L), with the emphasis of the collisionless damping of zonal flows. The nonlinear equations are solved by using Fourier decomposition in poloidal and toroidal directions and semi-implicit finite difference method along radial direction. The numerical implementation is briefly explained, especially on the periodic boundary condition in GFT_L version. As a numerical test and also practical application, the nonlinear excitation of geodesic acoustic mode (GAM), as well as its radial structure, is investigated in tokamak plasma turbulence.


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PACS: 52.35.Kt, 52.35.Ra, 52.65.Tt, 52.55.Fa
Key words: Geodesic acoustic mode (GAM), zonal flow, ion temperature gradient (ITG) turbulence, gyrofluid simulation, tokamak.

*Corresponding author.
Email: lijq@energy.kyoto-u.ac.jp (J. Li), kishimoto@energy.kyoto-u.ac.jp (Y. Kishimoto)
 

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