1995•Unpublished venueOpen access

Ballooning instability precursors to high {beta} disruptions

NJ (United States). Plasma Physics Lab. Princeton Univ., E Fredrickson, USDOE, Washington, DC (United States) (US), K McGuire, Z Chang

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Abstract

Strongly ballooning modes have been found as precursors to high {beta} disruptions on TFTR. The modes are typically localized to a region spanning about 60{degree} in the toroidal direction. The toroidal localization is associated with lower frequency, global Magneto-Hydro-Dynamic (MHD) activity, typically an ideal n = 1 kink mode. They have moderate to high frequency (f = 10--20 f{sub rot}), implying toroidal mode numbers in the range n = 10--20. The growth rates for the modes are large, of order 10{sup 4}/sec.

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Key concepts: Ballooning, Toroid, Instability, Physics, BETA (programming language), Magnetohydrodynamics, Mode (computer interface), Order (exchange)