Drift and geodesic effects on the ion sound eigenmode in tokamak plasmas

Journal Article · Sun May 15 04:00:00 EDT 2016 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X16050032· OSTI ID:22614132

Melnikov, A. V. ^[1]; Galvão, R. M. O. ^[2]

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1. National Research Centre Kurchatov Institute (Russian Federation)
2. University of San Paulo, Institute of Physics (Brazil)

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.

• OSTI ID: 22614132
• Journal Information: Plasma Physics Reports, Journal Name: Plasma Physics Reports Journal Issue: 5 Vol. 42; ISSN PPHREM; ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
GEODESICS
HARMONICS
KINETICS
PLASMA
SOUND WAVES
TOKAMAK DEVICES