Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

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Ya. I. Kolesnichenko¹, H. Wobig², Yu. V. Yakovenko¹, J. Kisslinger<sup>2

1</sup>Institute for Nuclear Research of the National Academy of Sciences of Ukraine
²Max-Planck Institut für Plasmaphysik, IPP-EURATOM Association, Garching bei München, Germany

Abstract: The Alfvén continuous spectrum in three-dimensional toroidal magnetic configurations is analyzed. Alfvén continua in Wendelstein-line stellarators (Wendelstein 7-AS and the designed Helias reactor HSR4/18) are calculated with the code COBRA, and the principal gaps in the Alfvén continua in these devices are found. It is shown that the shape of the plasma cross section strongly affects the Alfvén spectrum. Peculiarities of the Alfvén continuum of low-shear configurations are discussed. The frequencies of the calculated gaps in the Alfvén continuum in W7-AS are compared with the frequencies of the experimentally observed plasma oscillations.

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