遠心力を考慮した準交換形不安定性と準ヘリカル不安定性の成長率

概要

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Growth rates of quasi-interchanges and quasi-helicals in the presence of a centrifugal potential are obtained in the tokomak approximation, using the analytical solution of motion. The centrifugal force makes a condition for stability and growth rates of quasi-interchanges in a compressible plasma more stringent and more dangerous respectively than in a incompressible one. For the very small increasing values of the centrifugal force quasi-helicals and type-2 modes of quasi=interchanges become more dangerous, while type-1 mode become less dangerous. For greatly increasing values of the centrifugal force both quasi-interchanges and quasi-helicals have higher growth rates and the greater unstable region of K.B, where k and B are the wavevector of the perturbation and the magnetic field, respectively.