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Abstract

An equation of shear Alfven eigenmodes (AE) in optimized stellarators of Wendelstein line (Helias configurations) is derived. The metric tensor coefficients, which are contained in this equation, are calculated analytically. Two numerical codes are developed: the first one, COBRA (COntinuum BRanches of Alfven waves), is intended for the investigation of the structure of Alfven continuum; the second, BOA (Branches Of Alfven modes), solves the eigenvalue problem. The family of possible gaps in Alfven continuum of a Helias configuration is obtained. It is predicted that there exist gaps which arise due to or are strongly affected by the variation of the shape of the plasma cross section along the large azimuth of the torus. In such gaps, discrete eigenmodes, namely, helicity-induced eigenmodes (HAE21) and mirror-induced eigenmodes (MAE) are found. It is shown that plasma inhomogeneity may suppress the AEs with a wide region of localization

Additional information

Authors: KOLESNICHENKO Y, Scientific Centre "Institute for Nuclear Research", 03680 Kyiv (UA);LUTSENKO V, Scientific Centre "Institute for Nuclear Research", 03680 Kyiv (UA);YAKOVENKO Y, Scientific Centre "Institute for Nuclear Research", 03680 Kyiv (UA);FESENYUK O, Scientific Centre "Institute for Nuclear Research", 03680 Kyiv (UA);WOBIG H, Max-Planc Institut fur Plasmaphysik, IPP-Euratom Association, D-85748 Garching bei Munchen (DE)
Bibliographic Reference: Article: Physics of Plasma, Vol. 8 (2001), pp. 491-509
Record Number: 200013216 / Last updated on: 2001-03-27
Category: PUBLICATION
Original language: en
Available languages: en
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