炉心プラズマ閉じ込めにおける負磁気シアーの効果(1) : 実験的研究

概要

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A negative magnetic shear configuration is a potentially attractive mode of operation which enables an economical steady-state tokamak fusion reactor with high beta, high confinement and large bootstrap current fraction. This paper provides a review of experimental studies on the negative shear. Though negative shear configurations are formed naturally with large bootstrap current fraction, they have also been formed by current ramp-up with neutral beam heating or off-axis current drive. Formation of internal transport barrier with remarkable reduction of particle and heat transport have been observed in negative shear plasmas. Neoclassical-level ion thermal diffusivity and particle diffusivity have been realized as a result of nearly perfect disappearance of anomalous transport. The thermal transport on electrons has also been reduced in some devices. High beta values have been attained in combination with the H-mode. High fusion performance has been demonstrated.
社団法人プラズマ・核融合学会の論文
1997-06-25