Quasi-linear evolution of tearing modes
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چکیده
منابع مشابه
Two Fluid Dynamo and Edge-Resonant m=0 Tearing Instability in Reversed Field Pinch
Current-driven tearing instabilities dominate magnetic relaxation in self-organized high temperature plasmas such as the reversed field pinch (RFP) and spheromak. In the Madison Symmetric Torus (MST) RFP experiments, they are observed in the form of magnetic field, flow velocity, and current density fluctuations that follow a temporally cyclic sawtooth behavior. During a sawtooth crash, a surge...
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We show that the nonlinear evolution of the cosmic gravitational clustering is approximately spatial local in the x-k (position-scale) phase space if the initial perturbations are Gaussian. That is, if viewing the mass field with modes in the phase space, the nonlinear evolution will cause strong coupling among modes with different scale k, but at the same spatial area x, while the modes at dif...
متن کاملIntroduction to Neoclassical Tearing Modes and the Role of Rotation
It is now well established from theoretical considerations and from several experimental observations of long pulse high β tokomak discharges that the limit on plasma pressure is not set by the ideal MHD modes but is rather due to the onset of low (m, n) resistive modes. These instabilities, which produce magnetic islands at the low order rational surfaces, appear to be well described by the ne...
متن کاملTheoretical Studies on Neoclassical Tearing Modes and Their Stabilization
Numerical simulation results for the nonlinear evolution of neoclassical tearing modes (NTMs) and the stabilization of NTMs by localized RF current drive are presented. It is shown that the saturated island width does not increase linearly with the local bootstrap current density fraction. The NTMs are found to be stabilized by a localized RF current drive, if a sufficiently large RF current is...
متن کاملComputational 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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