Initial physics achievements of large helical device experiments

O. Motojima, H. Yamada, A. Komori, N. Ohyabu, K. Kawahata, O. Kaneko, S. Masuzaki, A. Ejiri, M. Emoto, H. Funaba, M. Goto, K. Ida, Hiroshi Idei, Inagaki Shigeru, N. Inoue, S. Kado, S. Kubo, R. Kumazawa, T. Minami, J. MiyazawaT. Morisaki, S. Morita, S. Murakami, S. Muto, T. Mutoh, Y. Nagayama, Y. Nakamura, H. Nakanishi, K. Narihara, K. Nishimura, N. Noda, T. Kobuchi, S. Ohdachi, Y. Oka, M. Osakabe, T. Ozaki, B. J. Peterson, A. Sagara, S. Sakakibara, R. Sakamoto, H. Sasao, M. Sasao, K. Sato, M. Sato, T. Seki, T. Shimozuma, M. Shoji, H. Suzuki, Y. Takeiri, K. Tanaka, K. Toi, T. Tokuzawa, K. Tsumori, K. Tsuzuki, I. Yamada, S. Yamaguchi, M. Yokoyama, K. Y. Watanabe, T. Watari, Y. Hamada, K. Matsuoka, K. Murai, K. Ohkubo, I. Ohtake, M. Okamoto, S. Satoh, T. Satow, S. Sudo, S. Tanahashi, K. Yamazaki, M. Fujiwara, A. Iiyoshi

Research output: Contribution to journalArticle

164 Citations (Scopus)

Abstract

The Large Helical Device (LHD) experiments [O. Motojima, et al., Proceedings, 16th Conference on Fusion Energy, Montreal, 1996 (International Atomic Energy Agency, Vienna, 1997), Vol. 3, p. 437] have started this year after a successful eight-year construction and test period of the fully superconducting facility. LHD investigates a variety of physics issues on large scale heliotron plasmas (R = 3.9 m, a = 0.6 m), which stimulates efforts to explore currentless and disruption-free steady plasmas under an optimized configuration. A magnetic field mapping has demonstrated the nested and healthy structure of magnetic surfaces, which indicates the successful completion of the physical design and the effectiveness of engineering quality control during the fabrication. Heating by 3 MW of neutral beam injection (NBI) has produced plasmas with a fusion triple product of 8 × 1018 keV m-3 s at a magnetic field of 1.5 T. An electron temperature of 1.5 keV and an ion temperature of 1.4 keV have been achieved. The maximum stored energy has reached 0.22 MJ, which corresponds to 〈β〉=0.7%, with neither unexpected confinement deterioration nor visible magnetohydrodynamics (MHD) instabilities. Energy confinement times, reaching 0.17 s at the maximum, have shown a trend similar to the present scaling law derived from the existing medium sized helical devices, but enhanced by 50%. The knowledge on transport, MHD, divertor, and long pulse operation, etc., are now rapidly increasing, which implies the successful progress of physics experiments on helical currentless-toroidal plasmas.

Original languageEnglish
Pages (from-to)1843-1850
Number of pages8
JournalPhysics of Plasmas
Volume6
Issue number5 I
DOIs
Publication statusPublished - Jan 1 1999

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magnetohydrodynamics
physics
fusion
toroidal plasmas
beam injection
neutral beams
ion temperature
nuclear energy
quality control
deterioration
magnetic fields
scaling laws
energy
congressional reports
engineering
electron energy
trends
fabrication
heating
products

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Motojima, O., Yamada, H., Komori, A., Ohyabu, N., Kawahata, K., Kaneko, O., ... Iiyoshi, A. (1999). Initial physics achievements of large helical device experiments. Physics of Plasmas, 6(5 I), 1843-1850. https://doi.org/10.1063/1.873443

Initial physics achievements of large helical device experiments. / Motojima, O.; Yamada, H.; Komori, A.; Ohyabu, N.; Kawahata, K.; Kaneko, O.; Masuzaki, S.; Ejiri, A.; Emoto, M.; Funaba, H.; Goto, M.; Ida, K.; Idei, Hiroshi; Shigeru, Inagaki; Inoue, N.; Kado, S.; Kubo, S.; Kumazawa, R.; Minami, T.; Miyazawa, J.; Morisaki, T.; Morita, S.; Murakami, S.; Muto, S.; Mutoh, T.; Nagayama, Y.; Nakamura, Y.; Nakanishi, H.; Narihara, K.; Nishimura, K.; Noda, N.; Kobuchi, T.; Ohdachi, S.; Oka, Y.; Osakabe, M.; Ozaki, T.; Peterson, B. J.; Sagara, A.; Sakakibara, S.; Sakamoto, R.; Sasao, H.; Sasao, M.; Sato, K.; Sato, M.; Seki, T.; Shimozuma, T.; Shoji, M.; Suzuki, H.; Takeiri, Y.; Tanaka, K.; Toi, K.; Tokuzawa, T.; Tsumori, K.; Tsuzuki, K.; Yamada, I.; Yamaguchi, S.; Yokoyama, M.; Watanabe, K. Y.; Watari, T.; Hamada, Y.; Matsuoka, K.; Murai, K.; Ohkubo, K.; Ohtake, I.; Okamoto, M.; Satoh, S.; Satow, T.; Sudo, S.; Tanahashi, S.; Yamazaki, K.; Fujiwara, M.; Iiyoshi, A.

In: Physics of Plasmas, Vol. 6, No. 5 I, 01.01.1999, p. 1843-1850.

Research output: Contribution to journalArticle

Motojima, O, Yamada, H, Komori, A, Ohyabu, N, Kawahata, K, Kaneko, O, Masuzaki, S, Ejiri, A, Emoto, M, Funaba, H, Goto, M, Ida, K, Idei, H, Shigeru, I, Inoue, N, Kado, S, Kubo, S, Kumazawa, R, Minami, T, Miyazawa, J, Morisaki, T, Morita, S, Murakami, S, Muto, S, Mutoh, T, Nagayama, Y, Nakamura, Y, Nakanishi, H, Narihara, K, Nishimura, K, Noda, N, Kobuchi, T, Ohdachi, S, Oka, Y, Osakabe, M, Ozaki, T, Peterson, BJ, Sagara, A, Sakakibara, S, Sakamoto, R, Sasao, H, Sasao, M, Sato, K, Sato, M, Seki, T, Shimozuma, T, Shoji, M, Suzuki, H, Takeiri, Y, Tanaka, K, Toi, K, Tokuzawa, T, Tsumori, K, Tsuzuki, K, Yamada, I, Yamaguchi, S, Yokoyama, M, Watanabe, KY, Watari, T, Hamada, Y, Matsuoka, K, Murai, K, Ohkubo, K, Ohtake, I, Okamoto, M, Satoh, S, Satow, T, Sudo, S, Tanahashi, S, Yamazaki, K, Fujiwara, M & Iiyoshi, A 1999, 'Initial physics achievements of large helical device experiments', Physics of Plasmas, vol. 6, no. 5 I, pp. 1843-1850. https://doi.org/10.1063/1.873443
Motojima O, Yamada H, Komori A, Ohyabu N, Kawahata K, Kaneko O et al. Initial physics achievements of large helical device experiments. Physics of Plasmas. 1999 Jan 1;6(5 I):1843-1850. https://doi.org/10.1063/1.873443
Motojima, O. ; Yamada, H. ; Komori, A. ; Ohyabu, N. ; Kawahata, K. ; Kaneko, O. ; Masuzaki, S. ; Ejiri, A. ; Emoto, M. ; Funaba, H. ; Goto, M. ; Ida, K. ; Idei, Hiroshi ; Shigeru, Inagaki ; Inoue, N. ; Kado, S. ; Kubo, S. ; Kumazawa, R. ; Minami, T. ; Miyazawa, J. ; Morisaki, T. ; Morita, S. ; Murakami, S. ; Muto, S. ; Mutoh, T. ; Nagayama, Y. ; Nakamura, Y. ; Nakanishi, H. ; Narihara, K. ; Nishimura, K. ; Noda, N. ; Kobuchi, T. ; Ohdachi, S. ; Oka, Y. ; Osakabe, M. ; Ozaki, T. ; Peterson, B. J. ; Sagara, A. ; Sakakibara, S. ; Sakamoto, R. ; Sasao, H. ; Sasao, M. ; Sato, K. ; Sato, M. ; Seki, T. ; Shimozuma, T. ; Shoji, M. ; Suzuki, H. ; Takeiri, Y. ; Tanaka, K. ; Toi, K. ; Tokuzawa, T. ; Tsumori, K. ; Tsuzuki, K. ; Yamada, I. ; Yamaguchi, S. ; Yokoyama, M. ; Watanabe, K. Y. ; Watari, T. ; Hamada, Y. ; Matsuoka, K. ; Murai, K. ; Ohkubo, K. ; Ohtake, I. ; Okamoto, M. ; Satoh, S. ; Satow, T. ; Sudo, S. ; Tanahashi, S. ; Yamazaki, K. ; Fujiwara, M. ; Iiyoshi, A. / Initial physics achievements of large helical device experiments. In: Physics of Plasmas. 1999 ; Vol. 6, No. 5 I. pp. 1843-1850.
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abstract = "The Large Helical Device (LHD) experiments [O. Motojima, et al., Proceedings, 16th Conference on Fusion Energy, Montreal, 1996 (International Atomic Energy Agency, Vienna, 1997), Vol. 3, p. 437] have started this year after a successful eight-year construction and test period of the fully superconducting facility. LHD investigates a variety of physics issues on large scale heliotron plasmas (R = 3.9 m, a = 0.6 m), which stimulates efforts to explore currentless and disruption-free steady plasmas under an optimized configuration. A magnetic field mapping has demonstrated the nested and healthy structure of magnetic surfaces, which indicates the successful completion of the physical design and the effectiveness of engineering quality control during the fabrication. Heating by 3 MW of neutral beam injection (NBI) has produced plasmas with a fusion triple product of 8 × 1018 keV m-3 s at a magnetic field of 1.5 T. An electron temperature of 1.5 keV and an ion temperature of 1.4 keV have been achieved. The maximum stored energy has reached 0.22 MJ, which corresponds to 〈β〉=0.7{\%}, with neither unexpected confinement deterioration nor visible magnetohydrodynamics (MHD) instabilities. Energy confinement times, reaching 0.17 s at the maximum, have shown a trend similar to the present scaling law derived from the existing medium sized helical devices, but enhanced by 50{\%}. The knowledge on transport, MHD, divertor, and long pulse operation, etc., are now rapidly increasing, which implies the successful progress of physics experiments on helical currentless-toroidal plasmas.",
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TY - JOUR

T1 - Initial physics achievements of large helical device experiments

AU - Motojima, O.

AU - Yamada, H.

AU - Komori, A.

AU - Ohyabu, N.

AU - Kawahata, K.

AU - Kaneko, O.

AU - Masuzaki, S.

AU - Ejiri, A.

AU - Emoto, M.

AU - Funaba, H.

AU - Goto, M.

AU - Ida, K.

AU - Idei, Hiroshi

AU - Shigeru, Inagaki

AU - Inoue, N.

AU - Kado, S.

AU - Kubo, S.

AU - Kumazawa, R.

AU - Minami, T.

AU - Miyazawa, J.

AU - Morisaki, T.

AU - Morita, S.

AU - Murakami, S.

AU - Muto, S.

AU - Mutoh, T.

AU - Nagayama, Y.

AU - Nakamura, Y.

AU - Nakanishi, H.

AU - Narihara, K.

AU - Nishimura, K.

AU - Noda, N.

AU - Kobuchi, T.

AU - Ohdachi, S.

AU - Oka, Y.

AU - Osakabe, M.

AU - Ozaki, T.

AU - Peterson, B. J.

AU - Sagara, A.

AU - Sakakibara, S.

AU - Sakamoto, R.

AU - Sasao, H.

AU - Sasao, M.

AU - Sato, K.

AU - Sato, M.

AU - Seki, T.

AU - Shimozuma, T.

AU - Shoji, M.

AU - Suzuki, H.

AU - Takeiri, Y.

AU - Tanaka, K.

AU - Toi, K.

AU - Tokuzawa, T.

AU - Tsumori, K.

AU - Tsuzuki, K.

AU - Yamada, I.

AU - Yamaguchi, S.

AU - Yokoyama, M.

AU - Watanabe, K. Y.

AU - Watari, T.

AU - Hamada, Y.

AU - Matsuoka, K.

AU - Murai, K.

AU - Ohkubo, K.

AU - Ohtake, I.

AU - Okamoto, M.

AU - Satoh, S.

AU - Satow, T.

AU - Sudo, S.

AU - Tanahashi, S.

AU - Yamazaki, K.

AU - Fujiwara, M.

AU - Iiyoshi, A.

PY - 1999/1/1

Y1 - 1999/1/1

N2 - The Large Helical Device (LHD) experiments [O. Motojima, et al., Proceedings, 16th Conference on Fusion Energy, Montreal, 1996 (International Atomic Energy Agency, Vienna, 1997), Vol. 3, p. 437] have started this year after a successful eight-year construction and test period of the fully superconducting facility. LHD investigates a variety of physics issues on large scale heliotron plasmas (R = 3.9 m, a = 0.6 m), which stimulates efforts to explore currentless and disruption-free steady plasmas under an optimized configuration. A magnetic field mapping has demonstrated the nested and healthy structure of magnetic surfaces, which indicates the successful completion of the physical design and the effectiveness of engineering quality control during the fabrication. Heating by 3 MW of neutral beam injection (NBI) has produced plasmas with a fusion triple product of 8 × 1018 keV m-3 s at a magnetic field of 1.5 T. An electron temperature of 1.5 keV and an ion temperature of 1.4 keV have been achieved. The maximum stored energy has reached 0.22 MJ, which corresponds to 〈β〉=0.7%, with neither unexpected confinement deterioration nor visible magnetohydrodynamics (MHD) instabilities. Energy confinement times, reaching 0.17 s at the maximum, have shown a trend similar to the present scaling law derived from the existing medium sized helical devices, but enhanced by 50%. The knowledge on transport, MHD, divertor, and long pulse operation, etc., are now rapidly increasing, which implies the successful progress of physics experiments on helical currentless-toroidal plasmas.

AB - The Large Helical Device (LHD) experiments [O. Motojima, et al., Proceedings, 16th Conference on Fusion Energy, Montreal, 1996 (International Atomic Energy Agency, Vienna, 1997), Vol. 3, p. 437] have started this year after a successful eight-year construction and test period of the fully superconducting facility. LHD investigates a variety of physics issues on large scale heliotron plasmas (R = 3.9 m, a = 0.6 m), which stimulates efforts to explore currentless and disruption-free steady plasmas under an optimized configuration. A magnetic field mapping has demonstrated the nested and healthy structure of magnetic surfaces, which indicates the successful completion of the physical design and the effectiveness of engineering quality control during the fabrication. Heating by 3 MW of neutral beam injection (NBI) has produced plasmas with a fusion triple product of 8 × 1018 keV m-3 s at a magnetic field of 1.5 T. An electron temperature of 1.5 keV and an ion temperature of 1.4 keV have been achieved. The maximum stored energy has reached 0.22 MJ, which corresponds to 〈β〉=0.7%, with neither unexpected confinement deterioration nor visible magnetohydrodynamics (MHD) instabilities. Energy confinement times, reaching 0.17 s at the maximum, have shown a trend similar to the present scaling law derived from the existing medium sized helical devices, but enhanced by 50%. The knowledge on transport, MHD, divertor, and long pulse operation, etc., are now rapidly increasing, which implies the successful progress of physics experiments on helical currentless-toroidal plasmas.

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