Free boundary ideal magnetohydrodynamic stability of three dimensional stellarators
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.
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
Original language: en
Available languages: en