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Report No.

Studies of radial electric field formation and its effect on fluctuations and transport barriers in the JFT-2M tokamak

Ida, Katsumi*; Miura, Yukitoshi; Ido, Takeshi*; Nagashima, Yoshihiko*; Shinohara, Koji

The mechanism of E$$times$$B flow formation, the effect of E$$times$$B flow on parallel flow, the reduction of fluctuation by the shearing effect of E$$times$$B flow, the relation between GAM and density fluctuation are discussed based on the experiments using various Er measurements on JFT-2. The experiments in the plasma with H-mode and counter-NB mode shows that the feedback loop of the E$$times$$B flow shear, fluctuation suppression and an increase of ion diamagnetic flow is a key of the formation of the transport barrier in toroidal plasmas. Two important effects of radial electric field are presented, one is fluctuation suppression by E$$times$$B flow shear and the other is a drive of parallel flow by radial electric field, which explain a driving mechanism of a spontaneous toroidal flow. The relation between GAM and density fluctuation is also discussed. The GAM is observed to be excited by the non-linear coupling of density fluctuations, while GAM itself affects the amplitude of density fluctuation.



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Category:Nuclear Science & Technology



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