Email this article Drift and geodesic effects on the ion sound eigenmode in tokamak plasmas
- Authors: Elfimov A.G.1, Smolyakov A.I.2,3, Melnikov A.V.3,4, Galvão R.M.1
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Affiliations:
- Institute of Physics
- University of Saskatchewan
- National Research Centre Kurchatov Institute
- National Research Nuclear University MEPhI
- Issue: Vol 42, No 5 (2016)
- Pages: 424-429
- Section: Waves and Instabilities in Plasma
- URL: https://journals.rcsi.science/1063-780X/article/view/185712
- DOI: https://doi.org/10.1134/S1063780X16050032
- ID: 185712
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Abstract
A kinetic treatment of geodesic acoustic modes (GAMs), taking into account ion parallel dynamics, drift and the second poloidal harmonic effects is presented. It is shown that first and second harmonics of the ion sound modes, which have respectively positive and negative radial dispersion, can be coupled due to the geodesic and drift effects. This coupling results in the drift geodesic ion sound eigenmode with a frequency below the standard GAM continuum frequency. Such eigenmode may be able to explain the split modes observed in some experiments.
About the authors
A. G. Elfimov
Institute of Physics
Author for correspondence.
Email: elfimov@if.usp.br
Brazil, San Paulo
A. I. Smolyakov
University of Saskatchewan; National Research Centre Kurchatov Institute
Email: elfimov@if.usp.br
Canada, 116 Science Place, Saskatoon; pl. Akademika Kurchatova 1, Moscow, 123182
A. V. Melnikov
National Research Centre Kurchatov Institute; National Research Nuclear University MEPhI
Email: elfimov@if.usp.br
Russian Federation, pl. Akademika Kurchatova 1, Moscow, 123182; Kashirskoe sh. 31, Moscow, 115409
R. M. O. Galvão
Institute of Physics
Email: elfimov@if.usp.br
Brazil, San Paulo
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