NIFS-087

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Author(s): S. -I. Itoh, K. Itoh, A. Fukuyama, Y. Miura and JFT-2M Group Title: ELMy-H mode as Limit Cycle and Chaotic Oscillations in Tokamak Plasmas Date of publication: May 1991 Key words: edge localized modes, limit cycle, bifurcation, radial electric field, chaos Abstract: A model of Edge Localized Modes (ELMs) in tokamak plasmas is presented. A Iimit cycle solution is found in the transport equation (time-dependent Ginzburg-Landau type) , which a has hysteresis curve between the gradient and flux. Periodic oscillation of the particle outflux and L/H intermediate state are predicted near the L/H transition boundary. A mesophase in spatial structure appears near edge. Chaotic oscillation is also predicted.

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