Physics Issues on Alfv´en Eigenmodes in Toroidal Magnetic Confinement. 4. Linear Theory of Alfv´en Eigenmodes in a Tokamak Plasmas

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  • トロイダル磁場閉じ込めにおけるアルヴェン固有モードに関する物理的課題 4.トカマクプラズマのアルヴェン固有モード線形理論
  • トカマクプラズマのアルヴェン固有モード線形理論
  • トカマク プラズマ ノ アルヴェン コユウ モード センケイ リロン

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Abstract

Theoretical and numerical studies on the linear stability of Alfvén eigenmodes in tokamak plasmas are reviewed. The behavior of various Alfvén Eigenmodes (AE), such as Toroidicity-induced AE (TAE), ellipticity-induced AE, non-circular AE, kinetic TAE, beta-induced AE, and energetic particle mode are described. Alfvén eigenmodes are excited when the destabilization by fast ions overcomes numerous stabilization mechanisms, such as continuum damping, Landau damping of electrons and fast ions, collisional damping of trapped electrons, and radiative damping due to kinetic Alfvén waves. Features of several TAE linear stability codes are tabulated. The NOVA-Kcode is described at some length and its computational results are compared with analytical predictions and experimental results.

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