Recent Results in Large Helical Device

Y. Nagayama; K. Ikeda; A. Komori; R. Kumazawa; S. Morita; N. Ohyabu; B. J. Peterson; S. Sakakibara; T. Shimozuma; H. Yamada; N. Ashikawa; H. Chikaraishi; M. Emoto; H. Funaba; P. Goncharov; M. Goto; Y. Hainada; K. Ida; T. Ido; H. Igami; S. Imagawa; S. Inagaki; A. Isayama; M. Isobe; A. Iwamoto; O. Kaneko; K. Kawahata; T. Kobuchi; Y. Kogi; S. Kubo; A. Mase; S. Masuzaki; K. Matsuoka; T. Minami; T. Mito; J. Miyazawa; T. Morisaki; S. Murakami; S. Muto; T. Mutoh; Y. Nakamura; H. Nakanishi; K. Narihara; Y. Narushima; A. Nishimura; K. Nishimura; A. Nishizawa; N. Noda; T. Notake; H. Nozato; S. Ohdachi; Y. Oka; M. Osakabe; S. Okajima; T. Ozaki; A. Sagara; K. Saito; M. Sakamotos; R. Sakamoto; M. Sasao; K. Sato; T. Seki; M. Shoji; S. Sudo; H. Suzuki; K. Takahata; Y. Takeiri; H. Takenaga; N. Tamura; K. Tanaka; K. Toi; T. Tokuzawa; Y. Torii; K. Tsumori; T. Uda; K. Y. Watanabe; I. Yamada; K. Yamazaki; N. Yanagi; M. Yokoyama; Y. Yoshimura; Y. Yoshinuma; T. Watari; O. Motojima

doi:10.1109/FUSION.2005.252854

Recent Results in Large Helical Device

Y. Nagayama, K. Ikeda, A. Komori, R. Kumazawa, S. Morita, N. Ohyabu, B. J. Peterson, S. Sakakibara, T. Shimozuma, H. Yamada, N. Ashikawa, H. Chikaraishi, M. Emoto, H. Funaba, P. Goncharov, M. Goto, Y. Hainada, K. Ida, T. Ido, H. IgamiS. Imagawa, S. Inagaki, A. Isayama, M. Isobe, A. Iwamoto, O. Kaneko, K. Kawahata, T. Kobuchi, Y. Kogi, S. Kubo, A. Mase, S. Masuzaki, K. Matsuoka, T. Minami, T. Mito, J. Miyazawa, T. Morisaki, S. Murakami, S. Muto, T. Mutoh, Y. Nakamura, H. Nakanishi, K. Narihara, Y. Narushima, A. Nishimura, K. Nishimura, A. Nishizawa, N. Noda, T. Notake, H. Nozato, S. Ohdachi, Y. Oka, M. Osakabe, S. Okajima, T. Ozaki, A. Sagara, K. Saito, M. Sakamotos, R. Sakamoto, M. Sasao, K. Sato, T. Seki, M. Shoji, S. Sudo, H. Suzuki, K. Takahata, Y. Takeiri, H. Takenaga, N. Tamura, K. Tanaka, K. Toi, T. Tokuzawa, Y. Torii, K. Tsumori, T. Uda, K. Y. Watanabe, I. Yamada, K. Yamazaki, N. Yanagi, M. Yokoyama, Y. Yoshimura, Y. Yoshinuma, T. Watari, O. Motojima

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

This paper presents recent experimental results in the Large Helical Device (LHD), which is the world largest helical system (R_ax ∼ 3.6 m, a_av ∼ 0.6 m, B_ax ∼ 2.75 T) and has capability of steady state operation because of the super conducting magnets. LHD confines the plasma with T_io ∼ 2 keV and ne ∼ 0.8 x 10¹⁹ m ^-3 for 1905 sec using the ICRF heating. In this case, the total plasma heating energy was ∼ 1.3 GJ. This indicates that high energy ions generated by ICRF is well confined. Large magnetic island in the vacuum field due to the error field is vanished in plasma with higher temperature or with higher beta, so the error field is not an issue in helical systems. The obtained averaged beta is more than 4.3 % in LHD. Since the beta is not limited by the MHD events or magnetic island but the beta is limited by the lack of heating power, further improvement of beta can be expected. Internal and external transport barrier have been also observed, and the electron temperature and the ion temperature exceed 10 keV in the improved confinement mode in LHD. Besides the potential of the disruption free steady stated operation, LHD experiment accumulates evidences so that fusion reactor becomes more realistic.

Original language	English
Title of host publication	21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05
DOIs	https://doi.org/10.1109/FUSION.2005.252854
Publication status	Published - 2006
Externally published	Yes
Event	21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05 - Knoxville, TN, United States Duration: Sept 26 2005 → Sept 29 2005

Publication series

Name	Proceedings - Symposium on Fusion Engineering

Other

Other	21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05
Country/Territory	United States
City	Knoxville, TN
Period	9/26/05 → 9/29/05

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Nuclear Energy and Engineering

Access to Document

10.1109/FUSION.2005.252854

Cite this

Nagayama, Y., Ikeda, K., Komori, A., Kumazawa, R., Morita, S., Ohyabu, N., Peterson, B. J., Sakakibara, S., Shimozuma, T., Yamada, H., Ashikawa, N., Chikaraishi, H., Emoto, M., Funaba, H., Goncharov, P., Goto, M., Hainada, Y., Ida, K., Ido, T., ... Motojima, O. (2006). Recent Results in Large Helical Device. In 21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05 Article 4018888 (Proceedings - Symposium on Fusion Engineering). https://doi.org/10.1109/FUSION.2005.252854

Nagayama, Y, Ikeda, K, Komori, A, Kumazawa, R, Morita, S, Ohyabu, N, Peterson, BJ, Sakakibara, S, Shimozuma, T, Yamada, H, Ashikawa, N, Chikaraishi, H, Emoto, M, Funaba, H, Goncharov, P, Goto, M, Hainada, Y, Ida, K, Ido, T, Igami, H, Imagawa, S, Inagaki, S, Isayama, A, Isobe, M, Iwamoto, A, Kaneko, O, Kawahata, K, Kobuchi, T, Kogi, Y, Kubo, S, Mase, A, Masuzaki, S, Matsuoka, K, Minami, T, Mito, T, Miyazawa, J, Morisaki, T, Murakami, S, Muto, S, Mutoh, T, Nakamura, Y, Nakanishi, H, Narihara, K, Narushima, Y, Nishimura, A, Nishimura, K, Nishizawa, A, Noda, N, Notake, T, Nozato, H, Ohdachi, S, Oka, Y, Osakabe, M, Okajima, S, Ozaki, T, Sagara, A, Saito, K, Sakamotos, M, Sakamoto, R, Sasao, M, Sato, K, Seki, T, Shoji, M, Sudo, S, Suzuki, H, Takahata, K, Takeiri, Y, Takenaga, H, Tamura, N, Tanaka, K, Toi, K, Tokuzawa, T, Torii, Y, Tsumori, K, Uda, T, Watanabe, KY, Yamada, I, Yamazaki, K, Yanagi, N, Yokoyama, M, Yoshimura, Y, Yoshinuma, Y, Watari, T & Motojima, O 2006, Recent Results in Large Helical Device. in 21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05., 4018888, Proceedings - Symposium on Fusion Engineering, 21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05, Knoxville, TN, United States, 9/26/05. https://doi.org/10.1109/FUSION.2005.252854

@inproceedings{c64de61244ea409c947cf40d55ecab1a,

title = "Recent Results in Large Helical Device",

abstract = "This paper presents recent experimental results in the Large Helical Device (LHD), which is the world largest helical system (Rax ∼ 3.6 m, aav ∼ 0.6 m, Bax ∼ 2.75 T) and has capability of steady state operation because of the super conducting magnets. LHD confines the plasma with Tio ∼ 2 keV and ne ∼ 0.8 x 1019 m -3 for 1905 sec using the ICRF heating. In this case, the total plasma heating energy was ∼ 1.3 GJ. This indicates that high energy ions generated by ICRF is well confined. Large magnetic island in the vacuum field due to the error field is vanished in plasma with higher temperature or with higher beta, so the error field is not an issue in helical systems. The obtained averaged beta is more than 4.3 % in LHD. Since the beta is not limited by the MHD events or magnetic island but the beta is limited by the lack of heating power, further improvement of beta can be expected. Internal and external transport barrier have been also observed, and the electron temperature and the ion temperature exceed 10 keV in the improved confinement mode in LHD. Besides the potential of the disruption free steady stated operation, LHD experiment accumulates evidences so that fusion reactor becomes more realistic.",

author = "Y. Nagayama and K. Ikeda and A. Komori and R. Kumazawa and S. Morita and N. Ohyabu and Peterson, {B. J.} and S. Sakakibara and T. Shimozuma and H. Yamada and N. Ashikawa and H. Chikaraishi and M. Emoto and H. Funaba and P. Goncharov and M. Goto and Y. Hainada and K. Ida and T. Ido and H. Igami and S. Imagawa and S. Inagaki and A. Isayama and M. Isobe and A. Iwamoto and O. Kaneko and K. Kawahata and T. Kobuchi and Y. Kogi and S. Kubo and A. Mase and S. Masuzaki and K. Matsuoka and T. Minami and T. Mito and J. Miyazawa and T. Morisaki and S. Murakami and S. Muto and T. Mutoh and Y. Nakamura and H. Nakanishi and K. Narihara and Y. Narushima and A. Nishimura and K. Nishimura and A. Nishizawa and N. Noda and T. Notake and H. Nozato and S. Ohdachi and Y. Oka and M. Osakabe and S. Okajima and T. Ozaki and A. Sagara and K. Saito and M. Sakamotos and R. Sakamoto and M. Sasao and K. Sato and T. Seki and M. Shoji and S. Sudo and H. Suzuki and K. Takahata and Y. Takeiri and H. Takenaga and N. Tamura and K. Tanaka and K. Toi and T. Tokuzawa and Y. Torii and K. Tsumori and T. Uda and Watanabe, {K. Y.} and I. Yamada and K. Yamazaki and N. Yanagi and M. Yokoyama and Y. Yoshimura and Y. Yoshinuma and T. Watari and O. Motojima",

year = "2006",

doi = "10.1109/FUSION.2005.252854",

language = "English",

isbn = "142440150X",

series = "Proceedings - Symposium on Fusion Engineering",

booktitle = "21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05",

note = "21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05 ; Conference date: 26-09-2005 Through 29-09-2005",

}

TY - GEN

T1 - Recent Results in Large Helical Device

AU - Nagayama, Y.

AU - Ikeda, K.

AU - Komori, A.

AU - Kumazawa, R.

AU - Morita, S.

AU - Ohyabu, N.

AU - Peterson, B. J.

AU - Sakakibara, S.

AU - Shimozuma, T.

AU - Yamada, H.

AU - Ashikawa, N.

AU - Chikaraishi, H.

AU - Emoto, M.

AU - Funaba, H.

AU - Goncharov, P.

AU - Goto, M.

AU - Hainada, Y.

AU - Ida, K.

AU - Ido, T.

AU - Igami, H.

AU - Imagawa, S.

AU - Inagaki, S.

AU - Isayama, A.

AU - Isobe, M.

AU - Iwamoto, A.

AU - Kaneko, O.

AU - Kawahata, K.

AU - Kobuchi, T.

AU - Kogi, Y.

AU - Kubo, S.

AU - Mase, A.

AU - Masuzaki, S.

AU - Matsuoka, K.

AU - Minami, T.

AU - Mito, T.

AU - Miyazawa, J.

AU - Morisaki, T.

AU - Murakami, S.

AU - Muto, S.

AU - Mutoh, T.

AU - Nakamura, Y.

AU - Nakanishi, H.

AU - Narihara, K.

AU - Narushima, Y.

AU - Nishimura, A.

AU - Nishimura, K.

AU - Nishizawa, A.

AU - Noda, N.

AU - Notake, T.

AU - Nozato, H.

AU - Ohdachi, S.

AU - Oka, Y.

AU - Osakabe, M.

AU - Okajima, S.

AU - Ozaki, T.

AU - Sagara, A.

AU - Saito, K.

AU - Sakamotos, M.

AU - Sakamoto, R.

AU - Sasao, M.

AU - Sato, K.

AU - Seki, T.

AU - Shoji, M.

AU - Sudo, S.

AU - Suzuki, H.

AU - Takahata, K.

AU - Takeiri, Y.

AU - Takenaga, H.

AU - Tamura, N.

AU - Tanaka, K.

AU - Toi, K.

AU - Tokuzawa, T.

AU - Torii, Y.

AU - Tsumori, K.

AU - Uda, T.

AU - Watanabe, K. Y.

AU - Yamada, I.

AU - Yamazaki, K.

AU - Yanagi, N.

AU - Yokoyama, M.

AU - Yoshimura, Y.

AU - Yoshinuma, Y.

AU - Watari, T.

AU - Motojima, O.

PY - 2006

Y1 - 2006

N2 - This paper presents recent experimental results in the Large Helical Device (LHD), which is the world largest helical system (Rax ∼ 3.6 m, aav ∼ 0.6 m, Bax ∼ 2.75 T) and has capability of steady state operation because of the super conducting magnets. LHD confines the plasma with Tio ∼ 2 keV and ne ∼ 0.8 x 1019 m -3 for 1905 sec using the ICRF heating. In this case, the total plasma heating energy was ∼ 1.3 GJ. This indicates that high energy ions generated by ICRF is well confined. Large magnetic island in the vacuum field due to the error field is vanished in plasma with higher temperature or with higher beta, so the error field is not an issue in helical systems. The obtained averaged beta is more than 4.3 % in LHD. Since the beta is not limited by the MHD events or magnetic island but the beta is limited by the lack of heating power, further improvement of beta can be expected. Internal and external transport barrier have been also observed, and the electron temperature and the ion temperature exceed 10 keV in the improved confinement mode in LHD. Besides the potential of the disruption free steady stated operation, LHD experiment accumulates evidences so that fusion reactor becomes more realistic.

AB - This paper presents recent experimental results in the Large Helical Device (LHD), which is the world largest helical system (Rax ∼ 3.6 m, aav ∼ 0.6 m, Bax ∼ 2.75 T) and has capability of steady state operation because of the super conducting magnets. LHD confines the plasma with Tio ∼ 2 keV and ne ∼ 0.8 x 1019 m -3 for 1905 sec using the ICRF heating. In this case, the total plasma heating energy was ∼ 1.3 GJ. This indicates that high energy ions generated by ICRF is well confined. Large magnetic island in the vacuum field due to the error field is vanished in plasma with higher temperature or with higher beta, so the error field is not an issue in helical systems. The obtained averaged beta is more than 4.3 % in LHD. Since the beta is not limited by the MHD events or magnetic island but the beta is limited by the lack of heating power, further improvement of beta can be expected. Internal and external transport barrier have been also observed, and the electron temperature and the ion temperature exceed 10 keV in the improved confinement mode in LHD. Besides the potential of the disruption free steady stated operation, LHD experiment accumulates evidences so that fusion reactor becomes more realistic.

UR - http://www.scopus.com/inward/record.url?scp=34547818223&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34547818223&partnerID=8YFLogxK

U2 - 10.1109/FUSION.2005.252854

DO - 10.1109/FUSION.2005.252854

M3 - Conference contribution

AN - SCOPUS:34547818223

SN - 142440150X

SN - 9781424401505

T3 - Proceedings - Symposium on Fusion Engineering

BT - 21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05

T2 - 21st IEEE/NPS Symposium on Fusion Engineering, SOFE'05

Y2 - 26 September 2005 through 29 September 2005

ER -

Recent Results in Large Helical Device

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