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Author(s):
K. Itoh, S.-I. Itoh, M. Yagi and A. Fukuyama
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Title:
Solitary Radial Electric Field Structure in Tokamak Plasmas
Date of publication:
Dec. 1997
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Key words:
radial electric field, shear viscosity, solitary structure, biased electrode, bifurcation, suppression of turbulence
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Abstract:
The solitary structure solution of the radial electric field E_r in the tokamak plasmas is obtained. It is shown to be stable under the external power supply like a biased electrode. The radial gradient is governed by the ion viscosity and the nonlinearlity of the perpendicular conductivity. The radial structure of E_r and reduction of turbulent transport are self-consistently determined. A bifurcation from a radially-uniform one to solitary one occurs at a certain applied voltage, and a hysteresis is associated.
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