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2007•Fusion Science & TechnologyOpen access

Ideal Magnetohydrodynamic Stability of the NCSX

G. Y. Fu, M. Yu. Isaev, L. P. Ku, М. И. Михайлов, M.H. Redi, R. Sánchez, A. V. Subbotin, W.A. Cooper, S. P. Hirshman, D. Monticello, A. Reiman, M. C. Zarnstorff

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Abstract

The ideal magnetohydrodynamic (MHD) stability of the National Compact Stellarator Experiment (NCSX) is extensively analyzed using the most advanced three-dimensional MHD codes. It is shown that the NCSX is stable to finite-n MHD modes, including the vertical mode, external kink modes and ballooning modes. However, high-n external kink modes that peak near the plasma edge are found to be weakly unstable. A global calculation shows that finite-n ballooning modes are significantly more stable than the local infinite-n modes.

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What this paper is about

The ideal magnetohydrodynamic (MHD) stability of the National Compact Stellarator Experiment (NCSX) is extensively analyzed using the most advanced three-dimensional MHD codes. It is shown that the NCSX is stable to finite-n MHD modes, including the vertical mode, external kink modes and ballooning modes. However, high-n external kink modes that peak near the plasma edge are found to be weakly unstable. A global calculation shows that finite-n ballooning modes are significantly more stable than the local infinite-n modes.

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Available abstract

The ideal magnetohydrodynamic (MHD) stability of the National Compact Stellarator Experiment (NCSX) is extensively analyzed using the most advanced three-dimensional MHD codes. It is shown that the NCSX is stable to finite-n MHD modes, including the vertical mode, external kink modes and ballooning modes. However, high-n external kink modes that peak near the plasma edge are found to be weakly unstable. A global calculation shows that finite-n ballooning modes are significantly more stable than the local infinite-n modes.

Key concepts: Ballooning, Magnetohydrodynamics, Magnetohydrodynamic drive, Stellarator, Physics, Ideal (ethics), Kink instability, Plasma

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