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(THP1/19) Theory of Dynamics in Long Pulse Helical Plasmas

K. Itoh¹⁾, H. Sanuki¹⁾, S. Toda¹⁾, S.-I. Itoh²⁾, M. Yagi²⁾, A. Fukuyama³⁾,M. Yokoyama^1)
 
1) National Institute for Fusion Science, Toki 509-5292, Japan
²⁾ Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
³⁾ Department of Nuclear Engineering, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan

Abstract.  Self-organized dynamics of toroidal helical plasma, which is induced by the nonlinear transport property, is discussed. Neoclassical ripple diffusion is a dominant mechanism that drives the radial electric field. The bifurcation nature of the electric field generation gives rise to the electric field domain interface, across which the electric field changes strongly. This domain interface is an origin of internal transport barrier in helical systems. This nonlinearity gives rise to the self-organized oscillations; the electric field pulsation is one of the examples. Based on the model of density limit, in which the competition between the transport loss and radiation loss is analyzed, dynamics near the density limit of helical systems is also discussed.

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