Transition from L mode to high ion temperature mode in CHS heliotron/torsatron plasmas

K. Ida; M. Osakabe; K. Tanaka; T. Minami; S. Nishimura; S. Okamura; A. Fujisawa; K. Yamazaki; Y. Yoshimura; S. Kubo; R. Akiyama; D. S. Darrow; H. Idei; H. Iguchi; M. Isobe; S. Kado; T. Kondo; S. Lee; K. Matsuoka; S. Morita; I. Nomura; S. Ohdachi; M. Sasao; A. Shimizu; S. Takagi; C. Takahashi; S. Takayama; M. Takechi; K. Toi; K. Tsumori; T. Watari

doi:10.1088/0029-5515/39/11Y/304

Transition from L mode to high ion temperature mode in CHS heliotron/torsatron plasmas

K. Ida, M. Osakabe, K. Tanaka, T. Minami, S. Nishimura, S. Okamura, A. Fujisawa, K. Yamazaki, Y. Yoshimura, S. Kubo, R. Akiyama, D. S. Darrow, H. Idei, H. Iguchi, M. Isobe, S. Kado, T. Kondo, S. Lee, K. Matsuoka, S. MoritaI. Nomura, S. Ohdachi, M. Sasao, A. Shimizu, S. Takagi, C. Takahashi, S. Takayama, M. Takechi, K. Toi, K. Tsumori, T. Watari

研究成果: Contribution to journal › Article › 査読

21 被引用数 (Scopus)

抄録

A high ion temperature (T_i) mode is observed for neutral beam heated plasmas in the Compact Helical System (CHS) heliotron/torsatron. The high T_i mode plasma is characterized by a high central ion temperature, T_i(O), and is associated with a peaked electron density profile produced by neutral beam fuelling with low wall recycling. Transition from L mode to high T_i mode has been studied in CHS. T_i(0) in the high T_i mode discharges reaches 1 keV, which is 2.5 times higher than that in the L mode discharges. The ion thermal diffusivity is significantly reduced by a factor of more than 2-3 in the high T_i mode plasma. The ion loss cone is observed in neutral particle flux in the energy range 1-6 keV with a narrow range of pitch angle (90°±20°) in the high T_i mode. However, the degradation of ion energy confinement due to this loss cone is negligible.

本文言語	英語
ページ（範囲）	1649-1658
ページ数	10
ジャーナル	Nuclear Fusion
巻	39
号	Special Issu
DOI	https://doi.org/10.1088/0029-5515/39/11Y/304
出版ステータス	出版済み - 1999
外部発表	はい

All Science Journal Classification (ASJC) codes

核物理学および高エネルギー物理学
凝縮系物理学

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10.1088/0029-5515/39/11Y/304

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Ida, K., Osakabe, M., Tanaka, K., Minami, T., Nishimura, S., Okamura, S., Fujisawa, A., Yamazaki, K., Yoshimura, Y., Kubo, S., Akiyama, R., Darrow, D. S., Idei, H., Iguchi, H., Isobe, M., Kado, S., Kondo, T., Lee, S., Matsuoka, K., ... Watari, T. (1999). Transition from L mode to high ion temperature mode in CHS heliotron/torsatron plasmas. Nuclear Fusion, 39(Special Issu), 1649-1658. https://doi.org/10.1088/0029-5515/39/11Y/304

Transition from L mode to high ion temperature mode in CHS heliotron/torsatron plasmas. / Ida, K.; Osakabe, M.; Tanaka, K.; Minami, T.; Nishimura, S.; Okamura, S.; Fujisawa, A.; Yamazaki, K.; Yoshimura, Y.; Kubo, S.; Akiyama, R.; Darrow, D. S.; Idei, H.; Iguchi, H.; Isobe, M.; Kado, S.; Kondo, T.; Lee, S.; Matsuoka, K.; Morita, S.; Nomura, I.; Ohdachi, S.; Sasao, M.; Shimizu, A.; Takagi, S.; Takahashi, C.; Takayama, S.; Takechi, M.; Toi, K.; Tsumori, K.; Watari, T.

In: Nuclear Fusion, Vol. 39, No. Special Issu, 1999, p. 1649-1658.

研究成果: Contribution to journal › Article › 査読

Ida, K, Osakabe, M, Tanaka, K, Minami, T, Nishimura, S, Okamura, S, Fujisawa, A, Yamazaki, K, Yoshimura, Y, Kubo, S, Akiyama, R, Darrow, DS, Idei, H, Iguchi, H, Isobe, M, Kado, S, Kondo, T, Lee, S, Matsuoka, K, Morita, S, Nomura, I, Ohdachi, S, Sasao, M, Shimizu, A, Takagi, S, Takahashi, C, Takayama, S, Takechi, M, Toi, K, Tsumori, K & Watari, T 1999, 'Transition from L mode to high ion temperature mode in CHS heliotron/torsatron plasmas', Nuclear Fusion, vol. 39, no. Special Issu, pp. 1649-1658. https://doi.org/10.1088/0029-5515/39/11Y/304

Ida, K. ; Osakabe, M. ; Tanaka, K. ; Minami, T. ; Nishimura, S. ; Okamura, S. ; Fujisawa, A. ; Yamazaki, K. ; Yoshimura, Y. ; Kubo, S. ; Akiyama, R. ; Darrow, D. S. ; Idei, H. ; Iguchi, H. ; Isobe, M. ; Kado, S. ; Kondo, T. ; Lee, S. ; Matsuoka, K. ; Morita, S. ; Nomura, I. ; Ohdachi, S. ; Sasao, M. ; Shimizu, A. ; Takagi, S. ; Takahashi, C. ; Takayama, S. ; Takechi, M. ; Toi, K. ; Tsumori, K. ; Watari, T. / Transition from L mode to high ion temperature mode in CHS heliotron/torsatron plasmas. In: Nuclear Fusion. 1999 ; Vol. 39, No. Special Issu. pp. 1649-1658.

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title = "Transition from L mode to high ion temperature mode in CHS heliotron/torsatron plasmas",

abstract = "A high ion temperature (Ti) mode is observed for neutral beam heated plasmas in the Compact Helical System (CHS) heliotron/torsatron. The high Ti mode plasma is characterized by a high central ion temperature, Ti(O), and is associated with a peaked electron density profile produced by neutral beam fuelling with low wall recycling. Transition from L mode to high Ti mode has been studied in CHS. Ti(0) in the high Ti mode discharges reaches 1 keV, which is 2.5 times higher than that in the L mode discharges. The ion thermal diffusivity is significantly reduced by a factor of more than 2-3 in the high Ti mode plasma. The ion loss cone is observed in neutral particle flux in the energy range 1-6 keV with a narrow range of pitch angle (90°±20°) in the high Ti mode. However, the degradation of ion energy confinement due to this loss cone is negligible.",

author = "K. Ida and M. Osakabe and K. Tanaka and T. Minami and S. Nishimura and S. Okamura and A. Fujisawa and K. Yamazaki and Y. Yoshimura and S. Kubo and R. Akiyama and Darrow, {D. S.} and H. Idei and H. Iguchi and M. Isobe and S. Kado and T. Kondo and S. Lee and K. Matsuoka and S. Morita and I. Nomura and S. Ohdachi and M. Sasao and A. Shimizu and S. Takagi and C. Takahashi and S. Takayama and M. Takechi and K. Toi and K. Tsumori and T. Watari",

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T1 - Transition from L mode to high ion temperature mode in CHS heliotron/torsatron plasmas

AU - Ida, K.

AU - Osakabe, M.

AU - Tanaka, K.

AU - Minami, T.

AU - Nishimura, S.

AU - Okamura, S.

AU - Fujisawa, A.

AU - Yamazaki, K.

AU - Yoshimura, Y.

AU - Kubo, S.

AU - Akiyama, R.

AU - Darrow, D. S.

AU - Idei, H.

AU - Iguchi, H.

AU - Isobe, M.

AU - Kado, S.

AU - Kondo, T.

AU - Lee, S.

AU - Matsuoka, K.

AU - Morita, S.

AU - Nomura, I.

AU - Ohdachi, S.

AU - Sasao, M.

AU - Shimizu, A.

AU - Takagi, S.

AU - Takahashi, C.

AU - Takayama, S.

AU - Takechi, M.

AU - Toi, K.

AU - Tsumori, K.

AU - Watari, T.

PY - 1999

Y1 - 1999

N2 - A high ion temperature (Ti) mode is observed for neutral beam heated plasmas in the Compact Helical System (CHS) heliotron/torsatron. The high Ti mode plasma is characterized by a high central ion temperature, Ti(O), and is associated with a peaked electron density profile produced by neutral beam fuelling with low wall recycling. Transition from L mode to high Ti mode has been studied in CHS. Ti(0) in the high Ti mode discharges reaches 1 keV, which is 2.5 times higher than that in the L mode discharges. The ion thermal diffusivity is significantly reduced by a factor of more than 2-3 in the high Ti mode plasma. The ion loss cone is observed in neutral particle flux in the energy range 1-6 keV with a narrow range of pitch angle (90°±20°) in the high Ti mode. However, the degradation of ion energy confinement due to this loss cone is negligible.

AB - A high ion temperature (Ti) mode is observed for neutral beam heated plasmas in the Compact Helical System (CHS) heliotron/torsatron. The high Ti mode plasma is characterized by a high central ion temperature, Ti(O), and is associated with a peaked electron density profile produced by neutral beam fuelling with low wall recycling. Transition from L mode to high Ti mode has been studied in CHS. Ti(0) in the high Ti mode discharges reaches 1 keV, which is 2.5 times higher than that in the L mode discharges. The ion thermal diffusivity is significantly reduced by a factor of more than 2-3 in the high Ti mode plasma. The ion loss cone is observed in neutral particle flux in the energy range 1-6 keV with a narrow range of pitch angle (90°±20°) in the high Ti mode. However, the degradation of ion energy confinement due to this loss cone is negligible.

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Transition from L mode to high ion temperature mode in CHS heliotron/torsatron plasmas

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