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Title: Geodesic acoustic modes in tokamak plasmas with a radial equilibrium electric field

The dispersion relation of geodesic acoustic modes in the tokamak plasma with an equilibrium radial electric field is derived and analyzed. Multiple branches of eigenmodes have been found, similar to the result given by the fluid model with a poloidal mass flow. Frequencies and damping rates of both the geodesic acoustic mode and the sound wave increase with respect to the strength of radial electric field, while the frequency and the damping rate of the lower frequency branch slightly decrease. Possible connection to the experimental observation is discussed.
Authors:
 [1]
  1. Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China and Centre for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031 (China)
Publication Date:
OSTI Identifier:
22490161
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 9; 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; DAMPING; DISPERSION RELATIONS; ELECTRIC FIELDS; EQUILIBRIUM; FLOW MODELS; MASS TRANSFER; PLASMA; SOUND WAVES; TOKAMAK DEVICES