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

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 ca...

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Bibliographic Details
Published in:Physics of plasmas 2010-03, Vol.17 (3), p.032112-032112-5
Main Authors: Hager, Robert, Hallatschek, Klaus
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
ION ACOUSTIC WAVES
ION WAVES
MATHEMATICS
NUMERICAL ANALYSIS
PLASMA
PLASMA WAVES
WAVE PROPAGATION
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Summary: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.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.3368796