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Title: Kinetic shear Alfvén instability in the presence of impurity ions in tokamak plasmas

The effects of impurity ions on the kinetic shear Alfvén (KSA) instability in tokamak plasmas are investigated by numerically solving the integral equations for the KSA eigenmode in the toroidal geometry. The kinetic effects of hydrogen and impurity ions, including transit motion, finite ion Larmor radius, and finite-orbit-width, are taken into account. Toroidicity induced linear mode coupling is included through the ballooning-mode representation. Here, the effects of carbon, oxygen, and tungsten ions on the KSA instability in toroidal plasmas are investigated. It is found that, depending on the concentration and density profile of the impurity ions, the latter can be either stabilizing or destabilizing for the KSA modes. The results here confirm the importance of impurity ions in tokamak experiments and should be useful for analyzing experimental data as well as for understanding anomalous transport and control of tokamak plasmas.
Authors:
; ; ; ;  [1] ;  [2] ;  [3]
  1. Southwestern Institute of Physics, P. O. Box 432, Chengdu 610041 (China)
  2. Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027 (China)
  3. School of Mathematics and Information, Ludong University, Yantai 264025 (China)
Publication Date:
OSTI Identifier:
22218530
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 10; 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; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALFVEN WAVES; BALLOONING INSTABILITY; CARBON; CHARGED-PARTICLE TRANSPORT; CONCENTRATION RATIO; HYDROGEN; INTEGRAL EQUATIONS; LARMOR RADIUS; NUMERICAL ANALYSIS; ORBITS; OXYGEN; PLASMA; PLASMA CONFINEMENT; PLASMA IMPURITIES; SHEAR; TOKAMAK DEVICES