Transition of poloidal viscosity by electrode biasing in the Large Helical Device

S. Kitajima, H. Takahashi, K. Ishii, Y. Sato, M. Kanno, J. Tachibana, A. Okamoto, M. Sasao, S. Inagaki, M. Takayama, S. Masuzaki, M. Shoji, N. Ashikawa, M. Tokitani, M. Yokoyama, Y. Suzuki, S. Satake, T. Ido, A. Shimizu, C. SuzukiY. Nagayama, T. Tokuzawa, K. Nishimura, T. Morisaki

Research output: Contribution to journalArticle

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Abstract

Electrode biasing experiments were carried out in various magnetic configurations on the Large Helical Device (LHD). The transitions of poloidal viscosity, which were accompanied with bifurcation phenomena characterized by a negative resistance in an electrode characteristic, were clearly observed on LHD by the electrode biasing. The critical external driving force required for transition was compared with the local maximum in ion viscosity, and the radial resistivity before the transition also compared with the expected value from a neoclassical theory. The critical driving force increased and the radial resistivity decreased with the major radius of the magnetic axis Rax going outwards. The configuration dependence of the transition condition and the radial resistivity qualitatively agreed with neoclassical theories. The radial electric field and the viscosity were also evaluated by the neoclassical transport code for a non-axisymmetric system, and estimated electrode voltage required for the transition, which was consistent with the experimental results.

Original languageEnglish
Article number073014
JournalNuclear Fusion
Volume53
Issue number7
DOIs
Publication statusPublished - Jul 1 2013

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viscosity
electrodes
electrical resistivity
configurations
radii
electric fields
electric potential
ions

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Kitajima, S., Takahashi, H., Ishii, K., Sato, Y., Kanno, M., Tachibana, J., ... Morisaki, T. (2013). Transition of poloidal viscosity by electrode biasing in the Large Helical Device. Nuclear Fusion, 53(7), [073014]. https://doi.org/10.1088/0029-5515/53/7/073014

Transition of poloidal viscosity by electrode biasing in the Large Helical Device. / Kitajima, S.; Takahashi, H.; Ishii, K.; Sato, Y.; Kanno, M.; Tachibana, J.; Okamoto, A.; Sasao, M.; Inagaki, S.; Takayama, M.; Masuzaki, S.; Shoji, M.; Ashikawa, N.; Tokitani, M.; Yokoyama, M.; Suzuki, Y.; Satake, S.; Ido, T.; Shimizu, A.; Suzuki, C.; Nagayama, Y.; Tokuzawa, T.; Nishimura, K.; Morisaki, T.

In: Nuclear Fusion, Vol. 53, No. 7, 073014, 01.07.2013.

Research output: Contribution to journalArticle

Kitajima, S, Takahashi, H, Ishii, K, Sato, Y, Kanno, M, Tachibana, J, Okamoto, A, Sasao, M, Inagaki, S, Takayama, M, Masuzaki, S, Shoji, M, Ashikawa, N, Tokitani, M, Yokoyama, M, Suzuki, Y, Satake, S, Ido, T, Shimizu, A, Suzuki, C, Nagayama, Y, Tokuzawa, T, Nishimura, K & Morisaki, T 2013, 'Transition of poloidal viscosity by electrode biasing in the Large Helical Device', Nuclear Fusion, vol. 53, no. 7, 073014. https://doi.org/10.1088/0029-5515/53/7/073014
Kitajima S, Takahashi H, Ishii K, Sato Y, Kanno M, Tachibana J et al. Transition of poloidal viscosity by electrode biasing in the Large Helical Device. Nuclear Fusion. 2013 Jul 1;53(7). 073014. https://doi.org/10.1088/0029-5515/53/7/073014
Kitajima, S. ; Takahashi, H. ; Ishii, K. ; Sato, Y. ; Kanno, M. ; Tachibana, J. ; Okamoto, A. ; Sasao, M. ; Inagaki, S. ; Takayama, M. ; Masuzaki, S. ; Shoji, M. ; Ashikawa, N. ; Tokitani, M. ; Yokoyama, M. ; Suzuki, Y. ; Satake, S. ; Ido, T. ; Shimizu, A. ; Suzuki, C. ; Nagayama, Y. ; Tokuzawa, T. ; Nishimura, K. ; Morisaki, T. / Transition of poloidal viscosity by electrode biasing in the Large Helical Device. In: Nuclear Fusion. 2013 ; Vol. 53, No. 7.
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