Geodesic acoustic mode in a reduced two-fluid model

Haijun REN (任海骏)

doi:10.1088/2058-6272/aa936f

Plasma Science and Technology > 2017 > 19(12): 122001. > DOI: 10.1088/2058-6272/aa936f

Haijun REN (任海骏). Geodesic acoustic mode in a reduced two-fluid model[J]. Plasma Science and Technology, 2017, 19(12): 122001. DOI: 10.1088/2058-6272/aa936f

Citation:

Haijun REN (任海骏). Geodesic acoustic mode in a reduced two-fluid model[J]. Plasma Science and Technology, 2017, 19(12): 122001. DOI: 10.1088/2058-6272/aa936f

Citation:

Haijun REN (任海骏). Geodesic acoustic mode in a reduced two-fluid model[J]. Plasma Science and Technology, 2017, 19(12): 122001. DOI: 10.1088/2058-6272/aa936f

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Geodesic acoustic mode in a reduced two-fluid model

Haijun REN (任海骏)

CAS Key Laboratory of Geospace Environment and Department of Modern Physics, University of Science and Technology of China, Hefei 230026, People’s Republic of China

Funds: This work was supported by the China National Magnetic Confinement Fusion Energy Research Project under Grant No. 2015GB120005, and National Natural Science Foundation of China No. 11275260.

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Received Date: August 09, 2017

Graphical Abstract

Abstract

Abstract

A reduced two-fluid model is constructed to investigate the geodesic acoustic mode (GAM). The ion dynamics is sufficiently considered by including an anisotropic pressure tensor and inhibited heat flux vector, whose evolutions are determined by equations derived from the 16-momentum model. Electrons are supposed to obey the Boltzmann distribution responding to the electrostatic oscillation with near ion acoustic velocity. In the large safety factor limit, the GAM frequency is identical with the kinetic one to the order of 1/ q² when zeroing the anisotropy. For general anisotropy, the reduced two-fluid model generates the frequency agreeing well with the kinetic result with arbitrary electron temperature. The present simplified fluid model will be of great use and interest for young researchers and students devoted to plasma physics.
- geodesic acoustic mode,
- fluid model,
- tokamak

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References (23)

References

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