Nonlinear dynamics of rotating drift-tearing modes in tokamak plasmas

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

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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 languageEnglish
Article number092506
JournalPhysics of Plasmas
Volume15
Issue number9
DOIs
Publication statusPublished - 2008

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Nishimura, S., Benkadda, S., Yagi, M., Itoh, S. I., & Itoh, K. (2008). Nonlinear dynamics of rotating drift-tearing modes in tokamak plasmas. Physics of Plasmas, 15(9), [092506]. https://doi.org/10.1063/1.2980286