Study of ion viscosity by spontaneous L-H transitions under marginal hot cathode biasing in the Tohoku University Heliac

S. Kitajima, H. Takahashi, Y. Tanaka, H. Utoh, M. Takenaga, M. Yokoyama, Inagaki Shigeru, Y. Suzuki, K. Nishimura, H. Ogawa, M. Takayama, J. Shinde, M. Ogawa, H. Aoyama, K. Iwazaki, A. Okamoto, K. Shinto, M. Sasao

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Abstract

Using the spontaneous transition condition under marginal hot cathode biasing, the ion viscosity at the L-H transition was estimated in various magnetic configurations in the Tohoku University Heliac. The critical viscosity, which is the viscosity at the transition point, was experimentally estimated from the J × B driving force. The critical viscosities in different magnetic configurations were in agreement with the neoclassical predictions within a factor of 2 and were compared with the viscosities obtained in the externally forced biasing experiments. Although the transition points were spread over a wide range, poloidal Mach numbers at the transition point were concentrated near the viscosity maxima predicted by the theory.

Original languageEnglish
Article number035002
JournalNuclear Fusion
Volume48
Issue number3
DOIs
Publication statusPublished - Mar 1 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Kitajima, S., Takahashi, H., Tanaka, Y., Utoh, H., Takenaga, M., Yokoyama, M., Shigeru, I., Suzuki, Y., Nishimura, K., Ogawa, H., Takayama, M., Shinde, J., Ogawa, M., Aoyama, H., Iwazaki, K., Okamoto, A., Shinto, K., & Sasao, M. (2008). Study of ion viscosity by spontaneous L-H transitions under marginal hot cathode biasing in the Tohoku University Heliac. Nuclear Fusion, 48(3), [035002]. https://doi.org/10.1088/0029-5515/48/3/035002