Excitation of geodesic acoustic mode in toroidal plasmas

K. Itoh; K. Hallatschek; S. I. Itoh

doi:10.1088/0741-3335/47/3/004

Excitation of geodesic acoustic mode in toroidal plasmas

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

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

97 Citations (Scopus)

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 language	English
Pages (from-to)	451-458
Number of pages	8
Journal	Plasma Physics and Controlled Fusion
Volume	47
Issue number	3
DOIs	https://doi.org/10.1088/0741-3335/47/3/004
Publication status	Published - Mar 2005

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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title = "Excitation of geodesic acoustic mode in toroidal plasmas",

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.",

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