Partition in power transfer and dissipation rate in self-sustained turbulence

S. I. Itoh, K. Itoh, A. Fukuyama, M. Yagi, M. Azumi, K. Nishikawa

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Abstract

Power partition and energy dissipation rates are examined for a self-sustained stationary turbulence of a high-n ballooning mode in a tokamak plasma. It is found that the power to excite fluctuations is almost equally transferred to perpendicular ion motion and to parallel electron motion. The ratio of the thermalized power, which excites and sustains the turbulence, to the total power lost by energy diffusion is found to be of the order of the broken symmetry parameter, i.e., the inverse aspect ratio, a/R. The dissipation rates of the fluctuations due to the thermal conductivity, the electron viscosity, and the ion viscosity are also calculated separately. The dissipation is dominated by that associated with the thermal conductivity. The relation between the induced global flux and the microscopic dissipation is also derived. It is found that a fractional part of order a/R of the dissipated power is effective in sustaining the turbulent modes.

Original languageEnglish
Pages (from-to)1154-1158
Number of pages5
JournalPhysics of Plasmas
Volume1
Issue number5
DOIs
Publication statusPublished - Jan 1 1994

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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    Itoh, S. I., Itoh, K., Fukuyama, A., Yagi, M., Azumi, M., & Nishikawa, K. (1994). Partition in power transfer and dissipation rate in self-sustained turbulence. Physics of Plasmas, 1(5), 1154-1158. https://doi.org/10.1063/1.870711