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Title: Nonlinear dynamics of toroidal Alfvén eigenmodes driven by energetic particles

A kinetic simulation code based on a reduced model is developed to study dynamic evolutions of a single toroidicity-induced shear Alfvén eigenmode driven by energetic particles. For zero background damping, it is found that the wave amplitude in nonlinear phase can either saturate for weak energetic particle drives or slowly increase for strong drives. This slow nonlinear growth in strong drive cases is found to be associated with broadening and overlapping of resonances between the wave and trapped particles. For the near-marginal-stability case with a large background damping, the mode nonlinear evolution exhibits strong upward and downward frequency chirping in multiple branches. A hole/clump formation is observed clearly in the corresponding evolution of energetic particle distribution.
Authors:
;  [1] ;  [2]
  1. Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou, Zhejiang 310027 (China)
  2. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451 (United States)
Publication Date:
OSTI Identifier:
22227953
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 7; Other Information: (c) 2013 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; ALFVEN WAVES; DAMPING; EIGENFUNCTIONS; EIGENVALUES; NONLINEAR PROBLEMS; PLASMA; PLASMA SIMULATION; PLASMA WAVES; SHEAR; TRAPPING