Model validation for radial electric feld excitation during L-H transition in JFT-2M tokamak

T. Kobayashi, K. Itoh, T. Ido, K. Kamiya, S. I. Itoh, Y. Miura, Y. Nagashima, A. Fujisawa, S. Inagaki, K. Ida, Kazuo Hoshino

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Abstract

In this paper, we elaborate the electric feld excitation mechanism during the L-H transition in the JFT-2M tokamak. Using time derivative of the Poisson's equation, models of the radial electric feld excitation is examined. The sum of the loss-cone loss current and the neoclassical bulk viscosity current is found to behave as the experimentally evaluated radial current that excites the radial electric feld. The turbulent Reynolds stress only plays a minor role. The wave convection current that produces a negative current at the edge can be important to explain the ambipolar condition in the L-mode.

Original languageEnglish
Article number072005
JournalNuclear Fusion
Volume57
Issue number7
DOIs
Publication statusPublished - 2017 Mar 10
Externally publishedYes

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Keywords

  • L-H transition
  • Radial current
  • Radial electric feld

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Kobayashi, T., Itoh, K., Ido, T., Kamiya, K., Itoh, S. I., Miura, Y., Nagashima, Y., Fujisawa, A., Inagaki, S., Ida, K., & Hoshino, K. (2017). Model validation for radial electric feld excitation during L-H transition in JFT-2M tokamak. Nuclear Fusion, 57(7), [072005]. https://doi.org/10.1088/1741-4326/aa5d03