Volume 85, Number 2, January 2009
Article Number 25004
Number of page(s) 6
Section Physics of Gases, Plasmas and Electric Discharges
Published online 02 February 2009
EPL, 85 (2009) 25004
DOI: 10.1209/0295-5075/85/25004

Drift-sound and drift-Alfvén eigenmodes in toroidal plasmas

Ya. I. Kolesnichenko1, V. V. Lutsenko1, A. Weller2, H. Thomsen2, Yu. V. Yakovenko1, J. Geiger2 and A. Werner2

1   Institute for Nuclear Research, National Academy of Sciences of Ukraine - Prospekt Nauky 47, Kyiv 03680, Ukraine
2   Max-Planck-Institut für Plasmaphysik, IPP-EURATOM Association - D-17491 Greifswald, Germany, EU

received 21 November 2008; accepted in final form 5 January 2009; published January 2009
published online 2 February 2009

Equations describing eigenmodes with the frequencies of the order of the geodesic acoustic frequency and the electron/ion diamagnetic frequency in toroidal plasmas are derived and analyzed, a code solving them is developed. It is shown that there exist drift-sound eigenmodes and a new kind of drift-Alfvén eigenmodes. This is done by means of an analytical consideration and numerical modelling of particular discharges in the stellarator Wendelstein 7-AS.

52.30.Ex - Two-fluid and multi-fluid plasmas.
52.35.-g - Waves, oscillations, and instabilities in plasmas and intense beams.
52.55.Hc - Stellarators, torsatrons, heliacs, bumpy tori, and other toroidal confinement devices.

© EPLA 2009