TITLE

Radial propagation of geodesic acoustic modes in up-down asymmetric magnetic geometries

AUTHOR(S)
Hager, Robert; Hallatschek, Klaus
PUB. DATE
March 2010
SOURCE
Physics of Plasmas;Mar2010, Vol. 17 Issue 3, p032112
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The energy approach to the analysis of the propagation of geodesic acoustic modes presented in the work of Hager and Hallatschek [Phys. Plasmas 16, 072503 (2009)] is generalized to up-down asymmetric magnetic geometries including a model for single-null configuration. By removing the neoclassical cancellation effects, up-down asymmetry can trigger a nonvanishing group velocity at zero radial wavenumber. A theoretical insight in this effect is provided by analytical calculations combined with numerical gyrokinetic and two-fluid studies. Thereby, an useful estimate of the group velocity at zero radial wavenumber is derived within a two-fluid framework.
ACCESSION #
48912114

 

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