Drift and geodesic effects on the ion sound eigenmode in tokamak plasmas
Journal Article
·
· Plasma Physics Reports
- National Research Centre Kurchatov Institute (Russian Federation)
- 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, Vol. 42, Issue 5; Other Information: Copyright (c) 2016 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-780X
- Country of Publication:
- United States
- Language:
- English
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