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Abstract

The 3D ideal MHD stability code TERPSICHORE is used to investigate the global external stability properties of the ATF device and the Wendelstein 7-X device. The stability of 3D ATF equilbria with zero net toroidal plasma current and bell-shaped pressure profiles shows that: (a) external modes alter the internal stability properties; (b) the coupling between the main toroidal Fourier components of the mode and their side-bands is destabilising; (c) the stabilising outward shift of the magnetic axis is confirmed; (d) the quadrupole field deteriorates stability by annihilating the vacuum magnetic well; (e) global stability is insensitive to pressure profile effects. The ideal MHD stability of a sequence of configurations with zero net toroidal current that varies from a conventional L=2 stellarator to the proposed Wendelstein 7-X device shows that the mode structures are essentially internal and that this proposed configuration is stable at beta=4.5% with a safe margin.

Additional information

Authors: COOPER W A, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Lausanne (CH);FU G Y, Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Lausanne (CH);SCHWAB C, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);SCHWENN U, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);GRUBER R, Groupe d'Applications Scientifiques sur Ordinateurs Vectoriels, Ecole Polytechnique Fédérale de Lausanne (CH);MERAZZI S, Groupe d'Applications Scientifiques sur Ordinateurs Vectoriels, Ecole Polytechnique Fédérale de Lausanne (CH);ANDERSON D V, National Energy Research Supercomputer Center, Lawrence Livermore National Laboratory, Livermore (US)
Bibliographic Reference: Paper presented: 13th International Conference on Plasma Physics and Controlled Nuclear Fusion Research, Washington D.C. (US), Oct. 1-6, 1990
Availability: Available from (1) as Paper EN 35756 ORA
Record Number: 199011587 / Last updated on: 1994-12-02
Category: PUBLICATION
Original language: en
Available languages: en