Excitation of geodesic acoustic mode in toroidal plasmas

K. Itoh, K. Hallatschek, S. I. Itoh

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Abstract

The instability of the geodesic acoustic mode (GAM) in tokamak turbulence is analysed. It can be caused by dynamic shearing of the ambient turbulence by GAMs combined with the poloidal inhomogeneity of the turbulent flux. The dispersion relation is derived. The competition between the drive mechanism and the damping by turbulence viscosity is discussed. GAMs are more unstable for high safety factors.

Original languageEnglish
Pages (from-to)451-458
Number of pages8
JournalPlasma Physics and Controlled Fusion
Volume47
Issue number3
DOIs
Publication statusPublished - Mar 1 2005

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All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

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