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Author(s):
K. Itoh, T. Ohkawa, S. -I.Itoh, M. Yagi and A. Fukuyama
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Title:
Suppression of Plasma Turbulence by Asymmetric Superthermal Ions
Date of publication:
July 1997
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Key words:
improved confinement, reduced magnetic shear, superthermal ions, current-diffusive ballooning mode, turbulent transport
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Abstract:
Influence of inhomogeneity of plasma flow on the magnetic surface, which is driven by the anisotropic superthermal ions , on the turbulence of the low/negative magnetic shear tokamak is investigated. It is found that the poloidal asymmetry of the pressure gradient of superthermal ions can suppress the current-diffusive ballooning mode turbulence which causes strong turbulent transport. The critical asymmetry of superthermal ions for the reduction of transport is derived. This theory provides the new mechanism of improved confinement associated with the reversed magnetic shear.
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