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论文类型：期刊论文

发表时间：2009-06-01

发表刊物：PLASMA SCIENCE & TECHNOLOGY

收录刊物：SCIE、CSCD

卷号：11

期号：3

页面范围：269-273

ISSN号：1009-0630

关键字：plasma pressure; Fourier transforms; MHD; kink instability

摘要：A semi-analytical method is introduced to study kink instability in cylindrical plasma with line-tied boundary conditions. The method is based on an expansion for magnetohydrodynamics (MHD) equations in one-dimensional (1D) radial eigenvalue problems by using Fourier transforms. The MHD equations then become an ordinary differential equation. This method is applicable to both ideal and non-ideal MHD problem. The effect of plasma pressure (P(0)) on kink instability is studied in a cylindrical geometry. Complex discrete spectra are presented. Two-dimensional (2D) eigenfunctions with the line-tied boundary conditions are obtained. The growth rate and radial eigenfunctions are different in the two cases of P(0) = 0 and P(0) not equal 0, which indicate that the effect of plasma pressure can not be ignored if it is large enough. This method allows us to understand the role of individual radial eigenfunctions, and is also computationally efficient compared to direct solutions of the MHD equations by the finite difference method.