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Title: Properties of toroidal Alfvén eigenmode in DIII-D plasma

Linear properties of the toroidal Alfvén eigenmode (TAE) excited by energetic particles (EP) in a DIII-D tokamak experiment have been studied in global gyrokinetic particle simulations treating self-consistently kinetic effects of EP, thermal ions, and electrons. Simulation results of the TAE frequency and mode structure agree very well with the experimental measurements. The non-perturbative EP contribution induces a radial localization of the TAE mode structure, a break-down of mode radial symmetry, as well as a frequency dependence on the toroidal mode number. The simulations further demonstrate the dependence of the growth rate and mode structure on EP pressure gradients. The in-out asymmetry of the mode structure and the experimental identification of the poloidal harmonics have also been clarified.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. University of California, Irvine, California 92697 (United States)
  2. Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451 (United States)
  3. Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou, Zhejiang 310058 (China)
  4. Fusion Simulation Center, Peking University, Beijing 100871 (China)
  5. Institute of Physics, Chinese Academy of Sciences, Beijing 100190 (China)
  6. General Atomics, San Diego, California 92121 (United States)
Publication Date:
OSTI Identifier:
22408104
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 2; 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; ALFVEN WAVES; ASYMMETRY; DOUBLET-3 DEVICE; EIGENVALUES; ELECTRONS; FREQUENCY DEPENDENCE; HARMONICS; IONS; PARTICLES; PLASMA; PRESSURE GRADIENTS; SIMULATION; SYMMETRY; TOROIDAL CONFIGURATION