Extension of the operational regime in high-temperature plasmas and the dynamic-transport characteristics in the LHD

H. Takahashi; M. Osakabe; K. Nagaoka; S. Murakami; I. Yamada; Y. Takeiri; M. Yokoyama; H. Lee; K. Ida; R. Seki; C. Suzuki; M. Yoshinuma; T. Ido; A. Shimizu; M. Goto; S. Morita; T. Shimozuma; S. Kubo; S. Satake; S. Matsuoka; N. Tamura; H. Tsuchiya; K. Tanaka; M. Nunami; A. Wakasa; K. Tsumori; K. Ikeda; H. Nakano; M. Kisaki; Y. Yoshimura; M. Nishiura; H. Igami; T. Seki; H. Kasahara; K. Saito; R. Kumazawa; S. Muto; K. Narihara; T. Mutoh; O. Kaneko; H. Yamada

doi:10.1088/0029-5515/53/7/073034

Extension of the operational regime in high-temperature plasmas and the dynamic-transport characteristics in the LHD

H. Takahashi, M. Osakabe, K. Nagaoka, S. Murakami, I. Yamada, Y. Takeiri, M. Yokoyama, H. Lee, K. Ida, R. Seki, C. Suzuki, M. Yoshinuma, T. Ido, A. Shimizu, M. Goto, S. Morita, T. Shimozuma, S. Kubo, S. Satake, S. MatsuokaN. Tamura, H. Tsuchiya, K. Tanaka, M. Nunami, A. Wakasa, K. Tsumori, K. Ikeda, H. Nakano, M. Kisaki, Y. Yoshimura, M. Nishiura, H. Igami, T. Seki, H. Kasahara, K. Saito, R. Kumazawa, S. Muto, K. Narihara, T. Mutoh, O. Kaneko, H. Yamada

Research output: Contribution to journal › Article

23 Citations (Scopus)

Abstract

A central ion temperature of 7 keV in a neutral beam injection (NBI)-heated plasma and a central-electron temperature of 20 keV in an electron cyclotron resonance heating plasma were achieved in the Large Helical Device (LHD) using an upgraded heating system with a newly installed perpendicular-NB injector and gyrotrons. The values of T_i and T_e significantly exceeded 5.6 and 15 keV, obtained in previous experiments, respectively. High-T _i plasma was obtained using a carbon pellet injection and the kinetic-energy confinement improved by a factor of 1.5. Transport analysis of the high-T_i plasmas showed that the ion-thermal diffusivity and the viscosity were reduced after the pellet injection. Dynamic-transport analysis is applied and the transition to the ion-internal-transport barrier and back transition are discussed.

Original language	English
Article number	073034
Journal	Nuclear Fusion
Volume	53
Issue number	7
DOIs	https://doi.org/10.1088/0029-5515/53/7/073034
Publication status	Published - Jul 1 2013
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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Takahashi, H., Osakabe, M., Nagaoka, K., Murakami, S., Yamada, I., Takeiri, Y., Yokoyama, M., Lee, H., Ida, K., Seki, R., Suzuki, C., Yoshinuma, M., Ido, T., Shimizu, A., Goto, M., Morita, S., Shimozuma, T., Kubo, S., Satake, S., ... Yamada, H. (2013). Extension of the operational regime in high-temperature plasmas and the dynamic-transport characteristics in the LHD. Nuclear Fusion, 53(7), [073034]. https://doi.org/10.1088/0029-5515/53/7/073034

Extension of the operational regime in high-temperature plasmas and the dynamic-transport characteristics in the LHD. / Takahashi, H.; Osakabe, M.; Nagaoka, K.; Murakami, S.; Yamada, I.; Takeiri, Y.; Yokoyama, M.; Lee, H.; Ida, K.; Seki, R.; Suzuki, C.; Yoshinuma, M.; Ido, T.; Shimizu, A.; Goto, M.; Morita, S.; Shimozuma, T.; Kubo, S.; Satake, S.; Matsuoka, S.; Tamura, N.; Tsuchiya, H.; Tanaka, K.; Nunami, M.; Wakasa, A.; Tsumori, K.; Ikeda, K.; Nakano, H.; Kisaki, M.; Yoshimura, Y.; Nishiura, M.; Igami, H.; Seki, T.; Kasahara, H.; Saito, K.; Kumazawa, R.; Muto, S.; Narihara, K.; Mutoh, T.; Kaneko, O.; Yamada, H.

In: Nuclear Fusion, Vol. 53, No. 7, 073034, 01.07.2013.

Research output: Contribution to journal › Article

Takahashi, H, Osakabe, M, Nagaoka, K, Murakami, S, Yamada, I, Takeiri, Y, Yokoyama, M, Lee, H, Ida, K, Seki, R, Suzuki, C, Yoshinuma, M, Ido, T, Shimizu, A, Goto, M, Morita, S, Shimozuma, T, Kubo, S, Satake, S, Matsuoka, S, Tamura, N, Tsuchiya, H, Tanaka, K, Nunami, M, Wakasa, A, Tsumori, K, Ikeda, K, Nakano, H, Kisaki, M, Yoshimura, Y, Nishiura, M, Igami, H, Seki, T, Kasahara, H, Saito, K, Kumazawa, R, Muto, S, Narihara, K, Mutoh, T, Kaneko, O & Yamada, H 2013, 'Extension of the operational regime in high-temperature plasmas and the dynamic-transport characteristics in the LHD', Nuclear Fusion, vol. 53, no. 7, 073034. https://doi.org/10.1088/0029-5515/53/7/073034

Takahashi, H. ; Osakabe, M. ; Nagaoka, K. ; Murakami, S. ; Yamada, I. ; Takeiri, Y. ; Yokoyama, M. ; Lee, H. ; Ida, K. ; Seki, R. ; Suzuki, C. ; Yoshinuma, M. ; Ido, T. ; Shimizu, A. ; Goto, M. ; Morita, S. ; Shimozuma, T. ; Kubo, S. ; Satake, S. ; Matsuoka, S. ; Tamura, N. ; Tsuchiya, H. ; Tanaka, K. ; Nunami, M. ; Wakasa, A. ; Tsumori, K. ; Ikeda, K. ; Nakano, H. ; Kisaki, M. ; Yoshimura, Y. ; Nishiura, M. ; Igami, H. ; Seki, T. ; Kasahara, H. ; Saito, K. ; Kumazawa, R. ; Muto, S. ; Narihara, K. ; Mutoh, T. ; Kaneko, O. ; Yamada, H. / Extension of the operational regime in high-temperature plasmas and the dynamic-transport characteristics in the LHD. In: Nuclear Fusion. 2013 ; Vol. 53, No. 7.

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abstract = "A central ion temperature of 7 keV in a neutral beam injection (NBI)-heated plasma and a central-electron temperature of 20 keV in an electron cyclotron resonance heating plasma were achieved in the Large Helical Device (LHD) using an upgraded heating system with a newly installed perpendicular-NB injector and gyrotrons. The values of Ti and Te significantly exceeded 5.6 and 15 keV, obtained in previous experiments, respectively. High-T i plasma was obtained using a carbon pellet injection and the kinetic-energy confinement improved by a factor of 1.5. Transport analysis of the high-Ti plasmas showed that the ion-thermal diffusivity and the viscosity were reduced after the pellet injection. Dynamic-transport analysis is applied and the transition to the ion-internal-transport barrier and back transition are discussed.",

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AU - Takahashi, H.

AU - Osakabe, M.

AU - Nagaoka, K.

AU - Murakami, S.

AU - Yamada, I.

AU - Takeiri, Y.

AU - Yokoyama, M.

AU - Lee, H.

AU - Ida, K.

AU - Seki, R.

AU - Suzuki, C.

AU - Yoshinuma, M.

AU - Ido, T.

AU - Shimizu, A.

AU - Goto, M.

AU - Morita, S.

AU - Shimozuma, T.

AU - Kubo, S.

AU - Satake, S.

AU - Matsuoka, S.

AU - Tamura, N.

AU - Tsuchiya, H.

AU - Tanaka, K.

AU - Nunami, M.

AU - Wakasa, A.

AU - Tsumori, K.

AU - Ikeda, K.

AU - Nakano, H.

AU - Kisaki, M.

AU - Yoshimura, Y.

AU - Nishiura, M.

AU - Igami, H.

AU - Seki, T.

AU - Kasahara, H.

AU - Saito, K.

AU - Kumazawa, R.

AU - Muto, S.

AU - Narihara, K.

AU - Mutoh, T.

AU - Kaneko, O.

AU - Yamada, H.

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