Simplified Ideal MHD Normal Mode Equations for Toroidal Axisymmetric Plasmas |
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Authors: | Bing-Ren SHI |
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Affiliation: | Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041, China |
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Abstract: | The ideal MHD normal mode equations for general toroidal axisymmetric plasmas can be significantly simplified by properly treating the compressibility team limiting cases: and cs is the plasma sound velocity.These equations describing the general global modes (the low n, m mode) contain only two scalar functions. For tokamak plasmas, a further simplification, the shear Alfven approkimation, is introduced. It makes possible to describe the global mode by a simplified eigenmode equation with only one scalar function. This eigenequation, similar to the reduced tokamak equations widely used in recent literatures, provides a unified way to analyze the kink, Alfven spectrum and MHD TAE modes. |
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