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

Nobuyuki Aiba, Makoto Hirota

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number065001
JournalPhysical review letters
Volume114
Issue number6
DOIs
Publication statusPublished - 2015 Feb 9

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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