Dynamic shear stabilization of hydromagnetic kink instabilities in plasmas through a parametric mode coupling.

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  • Minami Kazuo
    Department of Electrical and Electronic Engineering, Tokyo Institute of Technology

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  • Dynamic Shear Stabilization Hydromagnetic Kink Instabilities in Plasmas through a Parametric Mode Coupling
  • Dynamic Shear Stabilization Hydromagnet

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The dynamic shear stabilization of the hydromagnetic kink instabilities in pinch plasmas is analyzed from the standpoint of a parametric mode coupling between the kink mode and an applied helical RF magnetic field. The analysis is limited to the case of the m=1 kink mode with long wave lengths in a unifrom and straight plasma column with sharp boundary. The dispersion relation of the kink mode in the presence of a small-amplitude l=1 RF magnetic field (torsional Alfven wave) is derived. The present analysis suggests that the dynamic shear stabilization can be more effective than the prediction of Mathieu equation given previously by various authors.

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