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(TH/P2-09) Kelvin-Helmholtz Instability and Kinetic Internal Kink Modes in Tokamaks

H. Naitou1), T. Kobayashi2), M. Yagi3), T. Matsumoto4), S. Tokuda4), Y. Kishimoto4)
1) Electrical and Electronic Engineering, Yamaguchi Uiversity, Ube, Japan
2) Media and Information Technology Center, Yamaguchi University, Ube, Japan
3) Research Institute for Applied Mechanics, Kyushu University, Kasuga, Japan
4) Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Ibaraki, Japan

Abstract.  The m=1 and n=1 kinetic internal kink (KIK) mode with a nonuniform density profile is studied by the cylindrical version of the gyro-reduced-MHD code which is one of the extended MHD codes being able to treat the physics beyond resistive MHD. Electron inertia and electron finite temperature effects are crucial. The linear mode structure of KIK mode includes the sheared poloidal flow with m=1, which excites the vortexes due to the Kelvin-Helmholtz (K-H) instability. We have found that there is a strong coupling between the KIK mode and the K-H mode even in the early nonlinear stage of KIK instability in which the width of the m=1 magnetic island is sufficiently small.

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IAEA 2003