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Abstract

Ion-temperature-gradient-driven (ITG) instabilities are now commonly held responsible for turbulence giving rize to anomalous radial energy transport in the core of tokamaks. The work presented in this paper is the application of the particle methods to simulate the fully nonlinear time evolution of these instabilities in axisymmetric toroidal plasmas. The physical model is based on the tyrokinetic equation for the ions, the adiabatic response for the electrons, the quasi-neutrality condition and the electrostatic approximation. The f method is used for the discretization of ion gyrocentre distribution function and the spline finite elements are chosen to represent both the electrostatic field and the "macro-particle" shape in the magnetic co-ordinates (s,0,y). Furthermore, the resulting code is coupled to the Grad-Shafranov solver CHEASE[1], thus allowing to simulate the ITG turbulence in realistic magnetic configurations. This combined finite element f method has been utilized successfully in linear ITG simulations in toroidal [2,3], helically symmetric [4] and straight bumpy configurations [5]. A fully 3D linear simulation code based on the same approach is currently under development[6].

Additional information

Authors: TRAN T M, Centre de Recherches en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);APPERT K, Centre de Recherches en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);FIVAZ M, Centre de Recherches en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);JOST G, Centre de Recherches en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);VACLAVIK J, Centre de Recherches en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH);VILLARD L, Centre de Recherches en Physique des Plasmas Ecole Polytechnique Federale, Lausanne (CH)
Bibliographic Reference: Article: Global Gyrokinetic Simulation of Ion-Temperature-Gradient-Driven Instabilities Using Particles, 1998, 1-14
Record Number: 199910433 / Last updated on: 1999-03-19
Category: PUBLICATION
Original language: en
Available languages: en