Quantification of Turbulent Driving Forces for the Geodesic Acoustic Mode in the JFT-2M Tokamak

T. Kobayashi; M. Sasaki; T. Ido; K. Kamiya; Y. Miura; Y. Nagashima; K. Ida; S. Inagaki; A. Fujisawa; S. I. Itoh; K. Itoh

doi:10.1103/PhysRevLett.120.045002

Quantification of Turbulent Driving Forces for the Geodesic Acoustic Mode in the JFT-2M Tokamak

T. Kobayashi, M. Sasaki, T. Ido, K. Kamiya, Y. Miura, Y. Nagashima, K. Ida, S. Inagaki, A. Fujisawa, S. I. Itoh, K. Itoh

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Abstract

We investigate spatial structures of turbulence and turbulent transport modulated by the geodesic acoustic mode (GAM), from which the excitation mechanism of the GAM is discussed. The GAM is found to be predominantly excited through a localized Reynolds stress force, rather than the dynamic shearing force. The evaluated growth rate is larger than the linear damping coefficients and is on the same order of magnitude as the effective growth rate evaluated from time evolution in the GAM kinetic energy.

Original language	English
Article number	045002
Journal	Physical Review Letters
Volume	120
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.120.045002
Publication status	Published - Jan 26 2018

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All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

Cite this

Kobayashi, T., Sasaki, M., Ido, T., Kamiya, K., Miura, Y., Nagashima, Y., ... Itoh, K. (2018). Quantification of Turbulent Driving Forces for the Geodesic Acoustic Mode in the JFT-2M Tokamak. Physical Review Letters, 120(4), [045002]. https://doi.org/10.1103/PhysRevLett.120.045002

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AU - Miura, Y.

AU - Nagashima, Y.

AU - Ida, K.

AU - Inagaki, S.

AU - Fujisawa, A.

AU - Itoh, S. I.

AU - Itoh, K.

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10.1103/PhysRevLett.120.045002