Excitation of flow-stabilized resistive wall mode by coupling with stable eigenmodes in Tokamaks

Nobuyuki Aiba, Makoto Hirota

研究成果: Article査読

4 被引用数 (Scopus)

抄録

In a rotating toroidal plasma surrounded by a resistive wall, it is shown that linear MHD instabilities can be excited by couplings between the resistive wall mode (RWM) and stable ideal MHD modes. In particular, it is shown that the RWM can couple not only with stable external kink modes but also with Alfvén eigenmodes that are ordinarily in the stable continuum of a toroidal plasma. The RWM growth rate is shown to peak whenever the Doppler shift caused by the plasma rotation cancels the frequency of an ideal MHD mode, so that the mode appears to have zero frequency in the laboratory frame. At these values of the rotation frequency, the RWM can overcome the stabilizing effects of plasma rotation, continuum damping, and ion Landau damping.

本文言語English
論文番号065001
ジャーナルPhysical review letters
114
6
DOI
出版ステータスPublished - 2015 2 9

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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