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

  • Waves and Instabilities in Plasma
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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.

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Authors and Affiliations

  1. Institute of Physics, University of San Paulo, San Paulo, Brazil

    A. G. Elfimov & R. M. O. Galvão

  2. University of Saskatchewan, 116 Science Place, Saskatoon, Canada

    A. I. Smolyakov

  3. National Research Centre Kurchatov Institute, pl. Akademika Kurchatova 1, Moscow, 123182, Russia

    A. I. Smolyakov & A. V. Melnikov

  4. National Research Nuclear University MEPhI, Kashirskoe sh. 31, Moscow, 115409, Russia

    A. V. Melnikov

Authors
  1. A. G. Elfimov
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  2. A. I. Smolyakov
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  3. A. V. Melnikov
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  4. R. M. O. Galvão
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Correspondence to A. G. Elfimov.

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Elfimov, A.G., Smolyakov, A.I., Melnikov, A.V. et al. Drift and geodesic effects on the ion sound eigenmode in tokamak plasmas. Plasma Phys. Rep. 42, 424–429 (2016). https://doi.org/10.1134/S1063780X16050032

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  • DOI: https://doi.org/10.1134/S1063780X16050032

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