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

T. Kobayashi, Makoto Sasaki, T. Ido, K. Kamiya, Y. Miura, Yoshihiko Nagashima, K. Ida, Inagaki Shigeru, akihide fujisawa, Sanae 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 languageEnglish
Article number045002
JournalPhysical Review Letters
Volume120
Issue number4
DOIs
Publication statusPublished - Jan 26 2018

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acoustics
Reynolds stress
shearing
kinetic energy
damping
turbulence
coefficients
excitation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Quantification of Turbulent Driving Forces for the Geodesic Acoustic Mode in the JFT-2M Tokamak. / Kobayashi, T.; Sasaki, Makoto; Ido, T.; Kamiya, K.; Miura, Y.; Nagashima, Yoshihiko; Ida, K.; Shigeru, Inagaki; fujisawa, akihide; Itoh, Sanae; Itoh, K.

In: Physical Review Letters, Vol. 120, No. 4, 045002, 26.01.2018.

Research output: Contribution to journalArticle

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AU - Ida, K.

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