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

Journal Article · Sun Jun 15 00:00:00 EDT 2014 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4885347· OSTI ID:22300268

Ma, Ruirui; Chavdarovski, Ilija ^[1]; Ye, Gaoxiang ^[2]; Wang, Xin ^[3]

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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)

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.

• OSTI ID: 22300268
• Journal Information: Physics of Plasmas, Vol. 21, Issue 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ANISOTROPY
DISPERSION RELATIONS
DISTURBANCES
FLUIDS
PERTURBATION THEORY
PLASMA
POTENTIAL ENERGY
SLOWING-DOWN
TAIL IONS