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(TH/1-4) Multiple-Scale Turbulence and Bifurcation

M. Yagi1), S.-I. Itoh1), M. Kawasaki1), K. Itoh2), A. Fukuyama3)
1) Research Institute for Applied Mechanics, Kyushu University, Kasuga, Japan
2) National Institute for Fusion Science, Toki, Japan
3) Department of Nuclear Engineering, Kyoto University, Kyoto, Japan

Abstract.  The turbulence composed of collective modes with different scale length is analyzed. The drift-type fluctuations in the range of ion Lamor radius (ITG, trapped particle modes, etc.) are called the 'semi-micro mode' and those in the range of electron skip depth are called the 'micro mode'. The nonlinear interplay and transition among them, phase diagram and statistical properties are analyzed. Interactions of the semi-micro and micro modes through inducing the zonal flow, in addition to direct one are also analyzed based on direct nonlinear simulation.

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IAEA 2003