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

Abstract

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
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 21; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
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

Citation Formats

Ma, Ruirui, Chavdarovski, Ilija, Ye, Gaoxiang, and Wang, Xin. Linear dispersion relation of beta-induced Alfvén eigenmodes in presence of anisotropic energetic ions. United States: N. p., 2014. Web. doi:10.1063/1.4885347.
Ma, Ruirui, Chavdarovski, Ilija, Ye, Gaoxiang, & Wang, Xin. Linear dispersion relation of beta-induced Alfvén eigenmodes in presence of anisotropic energetic ions. United States. https://doi.org/10.1063/1.4885347
Ma, Ruirui, Chavdarovski, Ilija, Ye, Gaoxiang, and Wang, Xin. 2014. "Linear dispersion relation of beta-induced Alfvén eigenmodes in presence of anisotropic energetic ions". United States. https://doi.org/10.1063/1.4885347.
@article{osti_22300268,
title = {Linear dispersion relation of beta-induced Alfvén eigenmodes in presence of anisotropic energetic ions},
author = {Ma, Ruirui and Chavdarovski, Ilija and Ye, Gaoxiang and Wang, Xin},
abstractNote = {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.},
doi = {10.1063/1.4885347},
url = {https://www.osti.gov/biblio/22300268}, journal = {Physics of Plasmas},
issn = {1070-664X},
number = 6,
volume = 21,
place = {United States},
year = {Sun Jun 15 00:00:00 EDT 2014},
month = {Sun Jun 15 00:00:00 EDT 2014}
}