3D nonlinear calculations of resistive tearing modes
نویسندگان
چکیده
منابع مشابه
Computational modeling of neoclassical and resistive magnetohydrodynamic tearing modes in tokamaks
Numerical studies of the nonlinear evolution of magnetohydrodynamic–type tearing modes in three-dimensional toroidal geometry with neoclassical effects are presented. The inclusion of neoclassical physics introduces an additional free-energy source for the nonlinear formation of magnetic islands through the effects of a bootstrap current in Ohm’s law. The neoclassical tearing mode is demonstrat...
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It is shown that the critical layer analysis, involved in the linear theory of internal modes, can be extended continuously into the early nonlinear regime. For the m = 1 resistive mode, the dynamical analysis involves two small parameters: the inverse of the magnetic Reynolds number S and the m = 1 mode amplitude A, that measures the amount of nonlinearities in the system. The location of the ...
متن کاملComparison between resistive and collisionless double tearing modes for nearby resonant surfaces
The linear instability and nonlinear dynamics of collisional (resistive) and collisionless (due to electron inertia) double tearing modes (DTMs) are compared with the use of a reduced cylindrical model of a tokamak plasma. We focus on cases where two q = 2 resonant surfaces are located a small distance apart. It is found that regardless of the magnetic reconnection mechanism, resistivity or ele...
متن کاملResistive tearing instability with equilibrium shear flow
The effect of equilibrium velocity shear on the resistive tearing instability has been systematically studied, using the boundary layer approach. Both the "constant-f/!" tearing mode, which has a growth rate that scales as S -3/5, and the "nonconstant-f/!" tearing mode [a' (as) -1/3» 1], which has a growth rate that scales as S -1/3, are analyzed in the presence of flow. Here S is the usual rat...
متن کاملTemperature-Gradient-Driven Tearing Modes
The observation of spontaneous islands growth in tokamak experiments indicates that the tearing mode could also be linearly unstable. However, in the framework of resistive magnetohydrodynamics, previous works have demonstrated that drift effects, electron heat transport along magnetic field lines and ion Larmor radius effects have stabilizing effects. Recently, numerical calculations and analy...
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ژورنال
عنوان ژورنال: Journal of Computational Physics
سال: 1981
ISSN: 0021-9991
DOI: 10.1016/0021-9991(81)90037-1