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The nonlinear saturation of beam-driven instabilities: Theory and experiment

  • Author(s): Heidbrink, WW
  • Duong, HH
  • Manson, J
  • Wilfrid, E
  • Oberman, C
  • Strait, EJ
  • et al.

Published Web Location

https://doi.org/10.1063/1.860752Creative Commons Attribution 4.0 International Public License
Abstract

Intense fast-ion populations created by neutral-beam injection into a tokamak can destabilize toroidicity-induced Alfvén eigenmodes (TAE modes) or internal kink modes. Experimentally, these modes stabilize when fast ions are ejected from the plasma, producing a cycle of relaxation oscillations about the marginal stability point. A pair of coupled differential equations describes this cycle. This simple theoretical formalism successfully describes the cycles observed during TAE experiments in DIII-D [Plasma Physics Controlled Nuclear Fusion Research, 1986 (International Atomic Energy Agency, Vienna, 1987), Vol. 1, p. 159]. © 1993 American Institute of Physics.

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