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; A. Okamoto; K. Shinto; S. Kitajima; M. Yokoyama; S. Inagaki; Y. Suzuki; K. Nishimura; M. Sasao

doi:10.13182/fst07-a1371

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, A. Okamoto, K. Shinto, S. Kitajima, M. Yokoyama, S. Inagaki, Y. Suzuki, K. Nishimura, M. Sasao

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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, n_eT_a, n_iT_i) 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 language	English
Pages (from-to)	268-270
Number of pages	3
Journal	Fusion Science and Technology
Volume	51
Issue number	2 T.
DOIs	https://doi.org/10.13182/fst07-a1371
Publication status	Published - Feb 2007
Externally published	Yes

All Science Journal Classification (ASJC) codes

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

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Ogawa, M., Ogawa, H., Takahashi, H., Tanaka, Y., Utoh, H., Shinde, J., Iwazaki, K., Aoyama, H., Umetsu, H., Okamoto, A., Shinto, K., Kitajima, S., Yokoyama, M., Inagaki, S., Suzuki, Y., Nishimura, K., & Sasao, M. (2007). Ion temperature measurements in Tohoku university Heliac for analysis of the improved mode transition. Fusion Science and Technology, 51(2 T.), 268-270. https://doi.org/10.13182/fst07-a1371

Ogawa, M, Ogawa, H, Takahashi, H, Tanaka, Y, Utoh, H, Shinde, J, Iwazaki, K, Aoyama, H, Umetsu, H, Okamoto, A, Shinto, K, Kitajima, S, Yokoyama, M, Inagaki, S, Suzuki, Y, Nishimura, K & Sasao, M 2007, 'Ion temperature measurements in Tohoku university Heliac for analysis of the improved mode transition', Fusion Science and Technology, vol. 51, no. 2 T., pp. 268-270. https://doi.org/10.13182/fst07-a1371

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title = "Ion temperature measurements in Tohoku university Heliac for analysis of the improved mode transition",

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.",

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

year = "2007",

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doi = "10.13182/fst07-a1371",

language = "English",

volume = "51",

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AU - Ogawa, M.

AU - Ogawa, H.

AU - Takahashi, H.

AU - Tanaka, Y.

AU - Utoh, H.

AU - Shinde, J.

AU - Iwazaki, K.

AU - Aoyama, H.

AU - Umetsu, H.

AU - Okamoto, A.

AU - Shinto, K.

AU - Kitajima, S.

AU - Yokoyama, M.

AU - Inagaki, S.

AU - Suzuki, Y.

AU - Nishimura, K.

AU - Sasao, M.

PY - 2007/2

Y1 - 2007/2

N2 - 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.

AB - 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.

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

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