Formation of Electron-Root Radial Electric Field and its Effect on Thermal Transport in LHD High Te Plasma

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  • Formation of Electron-Root Radial Electric Field and its Effect on Thermal Transport in LHD High <i>T</i><sub>e </sub>Plasma

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Neoclassical transport analyses have been performed for a high electron temperature LHD plasma with steep temperature gradient using a neoclassical transport simulation code, FORTEC-3D. It is shown that the large positive radial electric field is spontaneously formed at the core along with the increase in the electron temperature, while the neoclassical heat diffusivity remains almost unchanged. This indicates that the 1/ν-type increase expected in the neoclassical transport in helical plasmas can be avoided by the spontaneous formation of the radial electric field. At the same time, it is found that the experimentally estimated heat diffusivity is significantly reduced. This suggests that the formation process of the transport barrier in the high electron temperature plasma can be caused by the spontaneous formation of the radial electric field.

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  • Plasma and Fusion Research

    Plasma and Fusion Research 8 (0), 1403039-1403039, 2013

    一般社団法人 プラズマ・核融合学会

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