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Author(s):
S. - I. Itoh, K. Itoh, A. Fukuyama
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Title:
ELMy-H mode as Limit Cycle and Chaotic Oscillations in Tokamak Plasmas
Date of publication:
June 1991
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Key words:
ELMy H-Mode, Edge Plasma, Tokamak, Radial Electric Field, Ion Viscosity Bifurcation, Limit Cycle, Chaotic Oscillation
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Abstract:
A model of Edge Localized Modes (ELMs) in tokamaks is presented. A Iimit cycle solution is found in time-dependent Ginzburg Landau type model equation of L/H transition, which has a hysteresis curve between the plasma gradient and flux. The oscillation of edge density appears near the L/H transition boundary. Spatial structure of the intermediate state (mesophase) is obtained in the edge region. Chaotic oscillation is predicted due to random neutrals and external oscillations.
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