Propagation direction of geodesic acoustic modes driven by drift wave turbulence

M. Sasaki; K. Itoh; T. Kobayashi; N. Kasuya; A. Fujisawa; S. I. Itoh

doi:10.1088/1741-4326/aad251

Propagation direction of geodesic acoustic modes driven by drift wave turbulence

M. Sasaki, K. Itoh, T. Kobayashi, N. Kasuya, A. Fujisawa, S. I. Itoh

Division of Nuclear Fusion Dynamics

Research output: Contribution to journal › Article › peer-review

9 Citations (Scopus)

Abstract

Selection rule of the radial propagation direction of geodesic acoustic modes (GAMs) is investigated. Here, we study the influence of nonlinear coupling with drift wave turbulence on the propagation direction of GAMs. Based on wave-kinetic equation for the turbulence, the phase-space dynamics is numerically solved and the nonlinear saturated states are obtained, where the phase-space consists of the real space and the wavenumber space. A wave pattern of the GAM in a nonlinear saturated state varies to form a standing wave, outward and inward propagating waves, depending on the peak radial wavenumber of the turbulence. The impact of nonlinear coupling with turbulence is discussed by deriving the GAM dispersion relation that includes the effect of the turbulence.

Original language	English
Article number	112005
Journal	Nuclear Fusion
Volume	58
Issue number	11
DOIs	https://doi.org/10.1088/1741-4326/aad251
Publication status	Published - Oct 3 2018

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/1741-4326/aad251

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title = "Propagation direction of geodesic acoustic modes driven by drift wave turbulence",

abstract = "Selection rule of the radial propagation direction of geodesic acoustic modes (GAMs) is investigated. Here, we study the influence of nonlinear coupling with drift wave turbulence on the propagation direction of GAMs. Based on wave-kinetic equation for the turbulence, the phase-space dynamics is numerically solved and the nonlinear saturated states are obtained, where the phase-space consists of the real space and the wavenumber space. A wave pattern of the GAM in a nonlinear saturated state varies to form a standing wave, outward and inward propagating waves, depending on the peak radial wavenumber of the turbulence. The impact of nonlinear coupling with turbulence is discussed by deriving the GAM dispersion relation that includes the effect of the turbulence.",

author = "M. Sasaki and K. Itoh and T. Kobayashi and N. Kasuya and A. Fujisawa and Itoh, {S. I.}",

note = "Funding Information: The authors would like to acknowledge Professor K. Hallatschek for useful discussion. This work was partly supported by a grant-in-aid for scientific research of JSPS, Japan (15H02155, 16K18335, 16H02442, 17H06089) and by the collaboration programs of NIFS (NIFS15KNST089, NIFS17KNST122) and of the RIAM of Kyushu University. Funding Information: This work was partly supported by a grant-in-aid for scientific research of JSPS, Japan (15H02155, 16K18335, 16H02442, 17H06089) and by the collaboration programs of NIFS (NIFS15KNST089, NIFS17KNST122) and of the RIAM of Kyushu University. Publisher Copyright: {\textcopyright} 2018 IAEA, Vienna.",

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doi = "10.1088/1741-4326/aad251",

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T1 - Propagation direction of geodesic acoustic modes driven by drift wave turbulence

AU - Sasaki, M.

AU - Itoh, K.

AU - Kobayashi, T.

AU - Kasuya, N.

AU - Fujisawa, A.

AU - Itoh, S. I.

N1 - Funding Information: The authors would like to acknowledge Professor K. Hallatschek for useful discussion. This work was partly supported by a grant-in-aid for scientific research of JSPS, Japan (15H02155, 16K18335, 16H02442, 17H06089) and by the collaboration programs of NIFS (NIFS15KNST089, NIFS17KNST122) and of the RIAM of Kyushu University. Funding Information: This work was partly supported by a grant-in-aid for scientific research of JSPS, Japan (15H02155, 16K18335, 16H02442, 17H06089) and by the collaboration programs of NIFS (NIFS15KNST089, NIFS17KNST122) and of the RIAM of Kyushu University. Publisher Copyright: © 2018 IAEA, Vienna.

PY - 2018/10/3

Y1 - 2018/10/3

N2 - Selection rule of the radial propagation direction of geodesic acoustic modes (GAMs) is investigated. Here, we study the influence of nonlinear coupling with drift wave turbulence on the propagation direction of GAMs. Based on wave-kinetic equation for the turbulence, the phase-space dynamics is numerically solved and the nonlinear saturated states are obtained, where the phase-space consists of the real space and the wavenumber space. A wave pattern of the GAM in a nonlinear saturated state varies to form a standing wave, outward and inward propagating waves, depending on the peak radial wavenumber of the turbulence. The impact of nonlinear coupling with turbulence is discussed by deriving the GAM dispersion relation that includes the effect of the turbulence.

AB - Selection rule of the radial propagation direction of geodesic acoustic modes (GAMs) is investigated. Here, we study the influence of nonlinear coupling with drift wave turbulence on the propagation direction of GAMs. Based on wave-kinetic equation for the turbulence, the phase-space dynamics is numerically solved and the nonlinear saturated states are obtained, where the phase-space consists of the real space and the wavenumber space. A wave pattern of the GAM in a nonlinear saturated state varies to form a standing wave, outward and inward propagating waves, depending on the peak radial wavenumber of the turbulence. The impact of nonlinear coupling with turbulence is discussed by deriving the GAM dispersion relation that includes the effect of the turbulence.

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JO - Nuclear Fusion

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Propagation direction of geodesic acoustic modes driven by drift wave turbulence

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