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Title: Linear dispersion relation of beta-induced Alfvén eigenmodes in presence of anisotropic energetic ions

Using the theoretical framework of the generalized fishbone-like dispersion relation, the linear properties of beta-induced Alfvén eigenmodes (BAEs) and energetic particle continuum modes (EPMs) excited by anisotropic slowing-down energetic ions are investigated analytically and numerically. The resonant contribution of energetic ions to the potential energy perturbation as well as fluid-like term describing the background plasma and adiabatic contribution of energetic ions are derived. For high-mode numbers, numerical results show smooth transition between the EP continuous spectrum and BAEs in the gap. EPMs and/or BAEs are destabilized by energetic ions, with real frequencies and growth rates strongly dependent on the energetic particle density and resonant frequency.
Authors:
;  [1] ;  [2] ;  [3]
  1. Institute for Fusion Theory and Simulation and Department of Physics, Zhejiang University, Hangzhou 310027 (China)
  2. Department of Physics, Zhejiang University, Hangzhou 310027 (China)
  3. Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, Garching 85748 (Germany)
Publication Date:
OSTI Identifier:
22300268
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 6; Other Information: (c) 2014 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; ANISOTROPY; DISPERSION RELATIONS; DISTURBANCES; FLUIDS; PERTURBATION THEORY; PLASMA; POTENTIAL ENERGY; SLOWING-DOWN; TAIL IONS