Poloidal eigenmode of the geodesic acoustic mode in the limit of high safety factor

M. Sasaki, K. Itoh, A. Ejiri, Y. Takase

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The poloidal eigenmode of the geodesic acoustic mode (GAM) is studied in the limit of high safety factor. In this limit, the poloidal gyroradius cannot be treated as a perturbation or as an expansion parameter. Analytical expressions for the poloidal structure of the GAM potential, the radial wavenumber dependence of the frequency, the phase velocity, and the group velocity are obtained. The spatial structure of the poloidal eigenmode including the higher-order gyroradius effect is revealed theoretically.

Original languageEnglish
Pages (from-to)721-729
Number of pages9
JournalJournal of Plasma Physics
Volume75
Issue number6
DOIs
Publication statusPublished - Dec 1 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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