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

Research output: Contribution to journalArticle

19 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)1649-1658
Number of pages10
JournalNuclear Fusion
Volume39
Issue numberSpecial Issu
DOIs
Publication statusPublished - Dec 1 1999

Fingerprint

ion temperature
neutral beams
cones
ions
refueling
electron density profiles
pitch (inclination)
neutral particles
thermal diffusivity
recycling
flux (rate)
degradation
energy

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Ida, K., Osakabe, M., Tanaka, K., Minami, T., Nishimura, S., Okamura, S., ... 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, 01.12.1999, p. 1649-1658.

Research output: Contribution to journalArticle

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 et al. Transition from L mode to high ion temperature mode in CHS heliotron/torsatron plasmas. Nuclear Fusion. 1999 Dec 1;39(Special Issu):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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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.",
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AU - Okamura, S.

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AU - Yoshimura, Y.

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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.

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