Geodesic acoustic modes in tokamak plasmas with anisotropic distribution and a radial equilibrium electric field

Yue MING (明玥); Deng ZHOU (周登); Wenjia WANG (王文家)

doi:10.1088/2058-6272/aabc5c

Plasma Science and Technology > 2018 > 20(8): 85101-085101. > DOI: 10.1088/2058-6272/aabc5c

Yue MING (明玥), Deng ZHOU (周登), Wenjia WANG (王文家). Geodesic acoustic modes in tokamak plasmas with anisotropic distribution and a radial equilibrium electric field[J]. Plasma Science and Technology, 2018, 20(8): 85101-085101. DOI: 10.1088/2058-6272/aabc5c

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Geodesic acoustic modes in tokamak plasmas with anisotropic distribution and a radial equilibrium electric field

¹ Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
² University of Science and Technology of China, Hefei 230026, People’s Republic of China
³ Center for Magnetic Fusion Theory, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China

Funds: This work is supported by National Natural Science Foundation of China (Grant No. 11675222).

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Received Date: January 04, 2018

Graphical Abstract

Abstract

Abstract

The dispersion relation of standard geodesic acoustic modes in tokamak plasmas with anisotropic distribution and a radial equilibrium electric field is derived and analyzed. Both frequencies and damping rates increase with respect to the poloidal Mach number which indicates the strength of the radial electric field. The strength of anisotropy is denoted by the ratio of the parallel temperature to the perpendicular temperature It is shown that, when the parallel temperature is lower than the perpendicular temperature, the enhanced anisotropy tends to enlarge the real frequency but reduces the damping rate, and when the parallel temperature is higher than the perpendicular temperature, the effect is opposite. The radial equilibrium electric field has stronger effect on the frequency and damping rate for the case with higher parallel temperature than the case with higher perpendicular temperature.
- geodesic acoustic mode,
- anisotropy,
- equilibrium flow

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References (30)

References

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