Ion temperature measurements in Tohoku university Heliac for analysis of the improved mode transition

M. Ogawa, H. Ogawa, H. Takahashi, Y. Tanaka, H. Utoh, J. Shinde, K. Iwazaki, H. Aoyama, H. Umetsu, Atsushi Okamoto, K. Shinto, S. Kitajima, M. Yokoyama, S. Inagaki, Y. Suzuki, K. Nishimura, M. Sasao

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

In the Tohoku University Heliac, transition to the improved mode has been observed when the plasma in biased with a hot cathode inserted into the plasma. Ion temperature measurement using high-resolution spectroscopy demonstrated that when the plasma was biased and transited to the improved mode, the ion temperature increased or was kept almost constant, and the ion density also increased. The total stored energy (the products of temperature and density, neTa, niTi) increased in the improved mode. In neoclassical theory, nonlinearity in ion viscosity plays a key role in the transition. The ion viscosity estimated from the measured ion temperature was consistent with the predictions of the neoclassical theory.

Original languageEnglish
Pages (from-to)268-270
Number of pages3
JournalFusion Science and Technology
Volume51
Issue number2 T.
DOIs
Publication statusPublished - 2007 Feb

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

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