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gyrofluid simulation of Ion-Scale Turbulence in Tokamak Plasmas

Communications in Computational Physics 2008年第10期4卷 1245-1257页

作者： Jiquan Li Y.Kishimoto Graduate School of Energy Science Kyoto UniversityUjiKyoto 611-0011Japan Institute for Fusion Theory and simulation ZhejiangUniversityHangzhouChina

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 *** 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 *** nonlinear equations are solved by using Fourier decomposition in poloidal and toroidal directions and semi-implicit finite difference method along radial *** numerical implementation is briefly explained,especially on the periodic boundary condition in GFT L *** 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.

关键词： Geodesic acoustic mode(GAM) zonal flow ion temperature gradient(ITG)turbulence gyrofluid simulation tokamak

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Dynamics of Secondary Large-Scale Structures in ETG Turbulence simulations

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Plasma Science and Technology 2006年第1期8卷 110-113页

作者：李继全 Y.KISHIMOTO 董家齐 N.MIYATO T.MATSUMOTO Southwestern Institute of Physics and SWIP-DUT Joint Lab for Fusion Plasma PhysicsChengdu 610041China Department of Fundamental Energy Kyoto University611-0011 GokashoUjiJapan Naka Fusion Research EstablishmentJAERINakaIbaraki 311-0193Japan Naka Fusion Research Establishment JAERINakaIbaraki 311-0193Japan

The dynamics of secondary large-scale structures in electron-temperature-gradient （ETG） turbulence is investigated based on gyrofluid simulations in sheared slab geometry. It is found that structural bifurcation to zonal flow dominated or streamer-like states depends on the spectral anisotropy of turbulent ETG fluctuation, which is governed by the magnetic shear. The turbulent electron transport is suppressed by enhanced zonal flows. However, it is still low even if the streamer is formed in ETG turbulence with strong shears. It is shown that the low transport may be related to the secondary excitation of poloidal long-wavelength mode due to the beat wave of the most unstable components or a modulation instability. This large-scale structure with a low frequency and a long wavelength may saturate, or at least contribute to the saturation of ETG fluctuations through a poloidal mode coupling. The result suggests a low fluctuation level in ETG turbulence.

关键词： large-scale structures ETG turbulence gyrofluid simulation tokamak

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Wave-Number Spectral Characteristics of Drift Wave Micro-Turbulence with Large-Scale Structures

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Plasma Science and Technology 2011年第3期13卷 297-301页

作者：李继全 Y.KISHIMOTO Graduate School of Energy Science Kyoto University 611-0011 Gokasho Uji Japan

Wave-number spectral characteristics of drift wave micro-turbulence with large-scale structures （LSSs） including zonal flows （ZFs） and Kelvin-Holmheltz （KH） mode are investigated based on three dimensional gyrofluid simulations in a slab geometry. The focus is on the property of the wave-number spectral scaling law of the ambient turbulence under the back reaction of the self-generated LSSs. A comparison of the spectral scaling laws between ion/electron temperature gradient （ITG/ETG） driven turbulences is presented. It is shown that the spectral scaling of the ITG turbulence with robust ZFs is fitted well by an exponential-law function （Φ^2/2）E∝e^-λkx in kx and a power-law one in （Φ^2/2）p∝ky^-β in ky. However, the ETG turbulence is characterized by a mixing Kolmogorov-like power-law and exponential-law （Φ^2/2）E∝e-λkx＇yk^-3x,y/（1 ＋ k^2x,y）^2 scaling for both kx and ky spectra due to the ZFs and KH mode dynamics, with λ and β the slope index factors. The underlying physical mechanism is understood as the spectral scattering caused by the back-reaction of the LSSs on the ambient turbulence. These findings may provide helpful guideline to diagnose the plasma fluctuations and flow structures in experiments.

关键词： spectral scaling law zonal flows micro-turbulence gyrofluid simulation

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