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Title: Interchange mode excited by trapped energetic ions

The kinetic energy principle describing the interaction between ideal magnetohydrodynamic (MHD) modes with trapped energetic ions is revised. A model is proposed on the basis of the reduced ideal MHD equations for background plasmas and the bounce-averaged drift-kinetic equation for trapped energetic ions. The model is applicable to large-aspect-ratio toroidal devices. Specifically, the effect of trapped energetic ions on the interchange mode in helical systems is analyzed. Results show that the interchange mode is excited by trapped energetic ions, even if the equilibrium states are stable to the ideal interchange mode. The energetic-ion-induced branch of the interchange mode might be associated with the fishbone mode in helical systems.
Authors:
 [1]
  1. Kobe City College of Technology, Kobe, Hyogo 651-2194 (Japan)
Publication Date:
OSTI Identifier:
22490970
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 7; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ASPECT RATIO; EQUILIBRIUM; INTERACTIONS; KINETIC ENERGY; KINETIC EQUATIONS; MAGNETOHYDRODYNAMICS; PLASMA; TAIL IONS; TOROIDAL CONFIGURATION; TRAPPING