Nonlinear dynamics of rotating drift-tearing modes in tokamak plasmas

S. Nishimura; S. Benkadda; M. Yagi; S. I. Itoh; K. Itoh

doi:10.1063/1.2980286

Nonlinear dynamics of rotating drift-tearing modes in tokamak plasmas

S. Nishimura, S. Benkadda, M. Yagi, S. I. Itoh, K. Itoh

Division of Nuclear Fusion Dynamics

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

21 Citations (Scopus)

Abstract

The rotation frequency of the drift-tearing mode is investigated with numerical simulations of reduced two-fluid equations. An extended analytical formula of the rotation frequency of the drift-tearing mode is derived, and is used to analyze numerical results. It is found that the rotation frequency depends strongly on the poloidal zonal flow generated by the drift-tearing mode. The dependence of the rotation frequency on transport coefficients is examined in the nonlinear saturation phase. It is found that ion viscosity μ and parallel resistivity η_|| play important roles by controlling the self-generated zonal flow through the change of the balance between the Reynolds stress and the Maxwell stress. The dependence of the rotation frequency on the magnetic Prandtl number μ/η_|| shows a monotonic increase.

Original language	English
Article number	092506
Journal	Physics of Plasmas
Volume	15
Issue number	9
DOIs	https://doi.org/10.1063/1.2980286
Publication status	Published - 2008

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.2980286

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title = "Nonlinear dynamics of rotating drift-tearing modes in tokamak plasmas",

abstract = "The rotation frequency of the drift-tearing mode is investigated with numerical simulations of reduced two-fluid equations. An extended analytical formula of the rotation frequency of the drift-tearing mode is derived, and is used to analyze numerical results. It is found that the rotation frequency depends strongly on the poloidal zonal flow generated by the drift-tearing mode. The dependence of the rotation frequency on transport coefficients is examined in the nonlinear saturation phase. It is found that ion viscosity μ and parallel resistivity η|| play important roles by controlling the self-generated zonal flow through the change of the balance between the Reynolds stress and the Maxwell stress. The dependence of the rotation frequency on the magnetic Prandtl number μ/η|| shows a monotonic increase.",

author = "S. Nishimura and S. Benkadda and M. Yagi and Itoh, {S. I.} and K. Itoh",

note = "Funding Information: This work is partially supported by a Grant-in-Aid for Specially Promoted Research of the Ministry of Education, Culture, Sports, Science and Technology of Japan (16002005) and a Grant-in-Aid for Scientific Research (B) (19360415) and by the collaboration program of Research Institute for Applied Mechanics of Kyushu University. We also acknowledge the collaboration program of the National Institute for Fusion Science, Japan (NIFS07KOAP017). Funding Information: The authors would like to thank X. Garbet, M. Ottaviani, D. Escande, M. Muraglia, and O. Agullo for useful discussions. N.S. would like to thank the College Doctoral Franco-Japonais for its fellowship and Asada Eiichi Scholarship of the Interdisciplinary Graduate School of Engineering Sciences Kyushu University. ",

year = "2008",

doi = "10.1063/1.2980286",

language = "English",

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journal = "Physics of Plasmas",

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T1 - Nonlinear dynamics of rotating drift-tearing modes in tokamak plasmas

AU - Nishimura, S.

AU - Benkadda, S.

AU - Yagi, M.

AU - Itoh, S. I.

AU - Itoh, K.

N1 - Funding Information: This work is partially supported by a Grant-in-Aid for Specially Promoted Research of the Ministry of Education, Culture, Sports, Science and Technology of Japan (16002005) and a Grant-in-Aid for Scientific Research (B) (19360415) and by the collaboration program of Research Institute for Applied Mechanics of Kyushu University. We also acknowledge the collaboration program of the National Institute for Fusion Science, Japan (NIFS07KOAP017). Funding Information: The authors would like to thank X. Garbet, M. Ottaviani, D. Escande, M. Muraglia, and O. Agullo for useful discussions. N.S. would like to thank the College Doctoral Franco-Japonais for its fellowship and Asada Eiichi Scholarship of the Interdisciplinary Graduate School of Engineering Sciences Kyushu University.

PY - 2008

Y1 - 2008

N2 - The rotation frequency of the drift-tearing mode is investigated with numerical simulations of reduced two-fluid equations. An extended analytical formula of the rotation frequency of the drift-tearing mode is derived, and is used to analyze numerical results. It is found that the rotation frequency depends strongly on the poloidal zonal flow generated by the drift-tearing mode. The dependence of the rotation frequency on transport coefficients is examined in the nonlinear saturation phase. It is found that ion viscosity μ and parallel resistivity η|| play important roles by controlling the self-generated zonal flow through the change of the balance between the Reynolds stress and the Maxwell stress. The dependence of the rotation frequency on the magnetic Prandtl number μ/η|| shows a monotonic increase.

AB - The rotation frequency of the drift-tearing mode is investigated with numerical simulations of reduced two-fluid equations. An extended analytical formula of the rotation frequency of the drift-tearing mode is derived, and is used to analyze numerical results. It is found that the rotation frequency depends strongly on the poloidal zonal flow generated by the drift-tearing mode. The dependence of the rotation frequency on transport coefficients is examined in the nonlinear saturation phase. It is found that ion viscosity μ and parallel resistivity η|| play important roles by controlling the self-generated zonal flow through the change of the balance between the Reynolds stress and the Maxwell stress. The dependence of the rotation frequency on the magnetic Prandtl number μ/η|| shows a monotonic increase.

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Nonlinear dynamics of rotating drift-tearing modes in tokamak plasmas

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