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The fishbone instability in the DIII-D tokamak

  • Author(s): Heidbrink, WW
  • Sager, G
  • et al.
Abstract

Although most DIII-D plasmas are stable to the fishbone instability, fishbones are sometimes observed when βp≳ 1.5 and n̄e5 × 1013 cm−3. These bursts are usually of minor significance operationally; however, under one condition, over 50% of the beam power was lost. The angle of beam injection has little effect on the virulence of the instability, suggesting that the fishbone instability in DIII-D is the ion diamagnetic branch of the internal kink. © 1990 IOP Publishing Ltd.

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