Formation of electron-root radial electric field and its effect on thermal transport in LHD high Te plasma

Seikichi Matsuoka, Shinsuke Satake, Hiromi Takahashi, Arimitsu Wakasa, Masayuki Yokoyama, Takeshi Ido, Akihiro Shimizu, Takashi Shimozuma, Sadayoshi Murakami

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Abstract

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/-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.

Original languageEnglish
Article number1403039
JournalPlasma and Fusion Research
Volume8
Issue number2013
DOIs
Publication statusPublished - Jun 24 2013
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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