Extension of operation regimes and investigation of three-dimensional currentless plasmas in the Large Helical Device

O. Kaneko; H. Yamada; S. Inagaki; M. Jakubowski; S. Kajita; S. Kitajima; Kobayashi; K. Koga; T. Morisaki; S. Morita; T. Mutoh; S. Sakakibara; Y. Suzuki; H. Takahashi; K. Tanaka; K. Toi; Y. Yoshimura; T. Akiyama; Y. Asahi; N. Ashikawa; H. Chikaraishi; A. Cooper; D. S. Darrow; E. Drapiko; P. Drewelow; X. Du; A. Ejiri; M. Emoto; T. Evans; N. Ezumi; K. Fujii; T. Fukuda; H. Funaba; M. Furukawa; D. A. Gates; M. Goto; T. Goto; W. Guttenfelder; S. Hamaguchi; M. Hasuo; T. Hino; Y. Hirooka; K. Ichiguchi; K. Ida; H. Idei; T. Ido; H. Igami; K. Ikeda; S. Imagawa; T. Imai; M. Isobe; M. Itagaki; T. Ito; K. Itoh; S. Itoh; A. Iwamoto; K. Kamiya; T. Kariya; H. Kasahara; N. Kasuya; D. Kato; T. Kato; K. Kawahata; F. Koike; S. Kubo; R. Kumazawa; D. Kuwahara; S. Lazerson; H. Lee; S. Masuzaki; S. Matsuoka; H. Matsuura; A. Matsuyama; C. Michael; D. Mikkelsen; O. Mitarai; T. Mito; J. Miyazawa; G. Motojima; K. Mukai; A. Murakami; I. Murakami; S. Murakami; T. Muroga; S. Muto; K. Nagaoka; K. Nagasaki; Y. Nagayama; N. Nakajima; H. Nakamura; Y. Nakamura; H. Nakanishi; H. Nakano; T. Nakano; K. Narihara; Y. Narushima; K. Nishimura; S. Nishimura; M. Nishiura; Y. M. Nunami; T. Obana; K. Ogawa; S. Ohdachi; N. Ohno; N. Ohyabu; T. Oishi; M. Okamoto; A. Okamoto; M. Osakabe; Y. Oya; T. Ozaki; N. Pablant; B. J. Peterson; A. Sagara; K. Saito; R. Sakamoto; H. Sakaue; M. Sasao; K. Sato; M. Sato; K. Sawada; R. Seki; T. Seki; V. Sergeev; S. Sharapov; I. Sharov; A. Shimizu; T. Shimozuma; M. Shiratani; M. Shoji; S. Sudo; H. Sugama; C. Suzuki; K. Takahata; Y. Takeiri; Y. Takemura; M. Takeuchi; H. Tamura; N. Tamura; H. Tanaka; T. Tanaka; M. Tingfeng; Y. Todo; M. Tokitani; K. Tokunaga; T. Tokuzawa; H. Tsuchiya; K. Tsumori; Y. Ueda; L. Vyacheslavov; K. Y. Watanabe; T. Watanabe; T. H. Watanabe; B. Wieland; I. Yamada; S. Yamada; S. Yamamoto; N. Yanagi; R. Yasuhara; M. Yokoyama; N. Yoshida; S. Yoshimura; T. Yoshinaga; M. Yoshinuma; A. Komori

doi:10.1088/0029-5515/53/10/104015

Extension of operation regimes and investigation of three-dimensional currentless plasmas in the Large Helical Device

O. Kaneko, H. Yamada, S. Inagaki, M. Jakubowski, S. Kajita, S. Kitajima, Kobayashi, K. Koga, T. Morisaki, S. Morita, T. Mutoh, S. Sakakibara, Y. Suzuki, H. Takahashi, K. Tanaka, K. Toi, Y. Yoshimura, T. Akiyama, Y. Asahi, N. AshikawaH. Chikaraishi, A. Cooper, D. S. Darrow, E. Drapiko, P. Drewelow, X. Du, A. Ejiri, M. Emoto, T. Evans, N. Ezumi, K. Fujii, T. Fukuda, H. Funaba, M. Furukawa, D. A. Gates, M. Goto, T. Goto, W. Guttenfelder, S. Hamaguchi, M. Hasuo, T. Hino, Y. Hirooka, K. Ichiguchi, K. Ida, H. Idei, T. Ido, H. Igami, K. Ikeda, S. Imagawa, T. Imai, M. Isobe, M. Itagaki, T. Ito, K. Itoh, S. Itoh, A. Iwamoto, K. Kamiya, T. Kariya, H. Kasahara, N. Kasuya, D. Kato, T. Kato, K. Kawahata, F. Koike, S. Kubo, R. Kumazawa, D. Kuwahara, S. Lazerson, H. Lee, S. Masuzaki, S. Matsuoka, H. Matsuura, A. Matsuyama, C. Michael, D. Mikkelsen, O. Mitarai, T. Mito, J. Miyazawa, G. Motojima, K. Mukai, A. Murakami, I. Murakami, S. Murakami, T. Muroga, S. Muto, K. Nagaoka, K. Nagasaki, Y. Nagayama, N. Nakajima, H. Nakamura, Y. Nakamura, H. Nakanishi, H. Nakano, T. Nakano, K. Narihara, Y. Narushima, K. Nishimura, S. Nishimura, M. Nishiura, Y. M. Nunami, T. Obana, K. Ogawa, S. Ohdachi, N. Ohno, N. Ohyabu, T. Oishi, M. Okamoto, A. Okamoto, M. Osakabe, Y. Oya, T. Ozaki, N. Pablant, B. J. Peterson, A. Sagara, K. Saito, R. Sakamoto, H. Sakaue, M. Sasao, K. Sato, M. Sato, K. Sawada, R. Seki, T. Seki, V. Sergeev, S. Sharapov, I. Sharov, A. Shimizu, T. Shimozuma, M. Shiratani, M. Shoji, S. Sudo, H. Sugama, C. Suzuki, K. Takahata, Y. Takeiri, Y. Takemura, M. Takeuchi, H. Tamura, N. Tamura, H. Tanaka, T. Tanaka, M. Tingfeng, Y. Todo, M. Tokitani, K. Tokunaga, T. Tokuzawa, H. Tsuchiya, K. Tsumori, Y. Ueda, L. Vyacheslavov, K. Y. Watanabe, T. Watanabe, T. H. Watanabe, B. Wieland, I. Yamada, S. Yamada, S. Yamamoto, N. Yanagi, R. Yasuhara, M. Yokoyama, N. Yoshida, S. Yoshimura, T. Yoshinaga, M. Yoshinuma, A. Komori

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

The progress of physical understanding as well as parameter improvement of net-current-free helical plasma is reported for the Large Helical Device since the last Fusion Energy Conference in Daejeon in 2010. The second low-energy neutral beam line was installed, and the central ion temperature has exceeded 7 keV, which was obtained by carbon pellet injection. Transport analysis of the high-T_i plasmas shows that the ion-thermal conductivity and viscosity decreased after the pellet injection although the improvement does not last long. The effort has been focused on the optimization of plasma edge conditions to extend the operation regime towards higher ion temperature and more stable high density and high beta. For this purpose a portion of the open helical divertors are being modified to the baffle-structured closed ones aimed at active control of the edge plasma. It is compared with the open case that the neutral pressure in the closed helical divertor increased by ten times as predicted by modelling. Studies of physics in a three-dimensional geometry are highlighted in the topics related to the response to a resonant magnetic perturbation at the plasma periphery such as edge-localized-mode mitigation and divertor detachment. Novel approaches of non-local and non-diffusive transport have also been advanced.

Original language	English
Article number	104015
Journal	Nuclear Fusion
Volume	53
Issue number	10
DOIs	https://doi.org/10.1088/0029-5515/53/10/104015
State	Published - Oct 2013
Externally published	Yes

Funding

Funders	Funder number
Engineering and Physical Sciences Research Council	EP/I501045/1

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1088/0029-5515/53/10/104015

Cite this

Kaneko, O., Yamada, H., Inagaki, S., Jakubowski, M., Kajita, S., Kitajima, S., Kobayashi, Koga, K., Morisaki, T., Morita, S., Mutoh, T., Sakakibara, S., Suzuki, Y., Takahashi, H., Tanaka, K., Toi, K., Yoshimura, Y., Akiyama, T., Asahi, Y., ... Komori, A. (2013). Extension of operation regimes and investigation of three-dimensional currentless plasmas in the Large Helical Device. Nuclear Fusion, 53(10), Article 104015. https://doi.org/10.1088/0029-5515/53/10/104015

@article{9d282479af8e450dbc07b385b9672801,

title = "Extension of operation regimes and investigation of three-dimensional currentless plasmas in the Large Helical Device",

abstract = "The progress of physical understanding as well as parameter improvement of net-current-free helical plasma is reported for the Large Helical Device since the last Fusion Energy Conference in Daejeon in 2010. The second low-energy neutral beam line was installed, and the central ion temperature has exceeded 7 keV, which was obtained by carbon pellet injection. Transport analysis of the high-Ti plasmas shows that the ion-thermal conductivity and viscosity decreased after the pellet injection although the improvement does not last long. The effort has been focused on the optimization of plasma edge conditions to extend the operation regime towards higher ion temperature and more stable high density and high beta. For this purpose a portion of the open helical divertors are being modified to the baffle-structured closed ones aimed at active control of the edge plasma. It is compared with the open case that the neutral pressure in the closed helical divertor increased by ten times as predicted by modelling. Studies of physics in a three-dimensional geometry are highlighted in the topics related to the response to a resonant magnetic perturbation at the plasma periphery such as edge-localized-mode mitigation and divertor detachment. Novel approaches of non-local and non-diffusive transport have also been advanced.",

author = "O. Kaneko and H. Yamada and S. Inagaki and M. Jakubowski and S. Kajita and S. Kitajima and Kobayashi and K. Koga and T. Morisaki and S. Morita and T. Mutoh and S. Sakakibara and Y. Suzuki and H. Takahashi and K. Tanaka and K. Toi and Y. Yoshimura and T. Akiyama and Y. Asahi and N. Ashikawa and H. Chikaraishi and A. Cooper and Darrow, {D. S.} and E. Drapiko and P. Drewelow and X. Du and A. Ejiri and M. Emoto and T. Evans and N. Ezumi and K. Fujii and T. Fukuda and H. Funaba and M. Furukawa and Gates, {D. A.} and M. Goto and T. Goto and W. Guttenfelder and S. Hamaguchi and M. Hasuo and T. Hino and Y. Hirooka and K. Ichiguchi and K. Ida and H. Idei and T. Ido and H. Igami and K. Ikeda and S. Imagawa and T. Imai and M. Isobe and M. Itagaki and T. Ito and K. Itoh and S. Itoh and A. Iwamoto and K. Kamiya and T. Kariya and H. Kasahara and N. Kasuya and D. Kato and T. Kato and K. Kawahata and F. Koike and S. Kubo and R. Kumazawa and D. Kuwahara and S. Lazerson and H. Lee and S. Masuzaki and S. Matsuoka and H. Matsuura and A. Matsuyama and C. Michael and D. Mikkelsen and O. Mitarai and T. Mito and J. Miyazawa and G. Motojima and K. Mukai and A. Murakami and I. Murakami and S. Murakami and T. Muroga and S. Muto and K. Nagaoka and K. Nagasaki and Y. Nagayama and N. Nakajima and H. Nakamura and Y. Nakamura and H. Nakanishi and H. Nakano and T. Nakano and K. Narihara and Y. Narushima and K. Nishimura and S. Nishimura and M. Nishiura and Nunami, {Y. M.} and T. Obana and K. Ogawa and S. Ohdachi and N. Ohno and N. Ohyabu and T. Oishi and M. Okamoto and A. Okamoto and M. Osakabe and Y. Oya and T. Ozaki and N. Pablant and Peterson, {B. J.} and A. Sagara and K. Saito and R. Sakamoto and H. Sakaue and M. Sasao and K. Sato and M. Sato and K. Sawada and R. Seki and T. Seki and V. Sergeev and S. Sharapov and I. Sharov and A. Shimizu and T. Shimozuma and M. Shiratani and M. Shoji and S. Sudo and H. Sugama and C. Suzuki and K. Takahata and Y. Takeiri and Y. Takemura and M. Takeuchi and H. Tamura and N. Tamura and H. Tanaka and T. Tanaka and M. Tingfeng and Y. Todo and M. Tokitani and K. Tokunaga and T. Tokuzawa and H. Tsuchiya and K. Tsumori and Y. Ueda and L. Vyacheslavov and Watanabe, {K. Y.} and T. Watanabe and Watanabe, {T. H.} and B. Wieland and I. Yamada and S. Yamada and S. Yamamoto and N. Yanagi and R. Yasuhara and M. Yokoyama and N. Yoshida and S. Yoshimura and T. Yoshinaga and M. Yoshinuma and A. Komori",

year = "2013",

month = oct,

doi = "10.1088/0029-5515/53/10/104015",

language = "English",

volume = "53",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing",

number = "10",

}

Kaneko, O, Yamada, H, Inagaki, S, Jakubowski, M, Kajita, S, Kitajima, S, Kobayashi, Koga, K, Morisaki, T, Morita, S, Mutoh, T, Sakakibara, S, Suzuki, Y, Takahashi, H, Tanaka, K, Toi, K, Yoshimura, Y, Akiyama, T, Asahi, Y, Ashikawa, N, Chikaraishi, H, Cooper, A, Darrow, DS, Drapiko, E, Drewelow, P, Du, X, Ejiri, A, Emoto, M, Evans, T, Ezumi, N, Fujii, K, Fukuda, T, Funaba, H, Furukawa, M, Gates, DA, Goto, M, Goto, T, Guttenfelder, W, Hamaguchi, S, Hasuo, M, Hino, T, Hirooka, Y, Ichiguchi, K, Ida, K, Idei, H, Ido, T, Igami, H, Ikeda, K, Imagawa, S, Imai, T, Isobe, M, Itagaki, M, Ito, T, Itoh, K, Itoh, S, Iwamoto, A, Kamiya, K, Kariya, T, Kasahara, H, Kasuya, N, Kato, D, Kato, T, Kawahata, K, Koike, F, Kubo, S, Kumazawa, R, Kuwahara, D, Lazerson, S, Lee, H, Masuzaki, S, Matsuoka, S, Matsuura, H, Matsuyama, A, Michael, C, Mikkelsen, D, Mitarai, O, Mito, T, Miyazawa, J, Motojima, G, Mukai, K, Murakami, A, Murakami, I, Murakami, S, Muroga, T, Muto, S, Nagaoka, K, Nagasaki, K, Nagayama, Y, Nakajima, N, Nakamura, H, Nakamura, Y, Nakanishi, H, Nakano, H, Nakano, T, Narihara, K, Narushima, Y, Nishimura, K, Nishimura, S, Nishiura, M, Nunami, YM, Obana, T, Ogawa, K, Ohdachi, S, Ohno, N, Ohyabu, N, Oishi, T, Okamoto, M, Okamoto, A, Osakabe, M, Oya, Y, Ozaki, T, Pablant, N, Peterson, BJ, Sagara, A, Saito, K, Sakamoto, R, Sakaue, H, Sasao, M, Sato, K, Sato, M, Sawada, K, Seki, R, Seki, T, Sergeev, V, Sharapov, S, Sharov, I, Shimizu, A, Shimozuma, T, Shiratani, M, Shoji, M, Sudo, S, Sugama, H, Suzuki, C, Takahata, K, Takeiri, Y, Takemura, Y, Takeuchi, M, Tamura, H, Tamura, N, Tanaka, H, Tanaka, T, Tingfeng, M, Todo, Y, Tokitani, M, Tokunaga, K, Tokuzawa, T, Tsuchiya, H, Tsumori, K, Ueda, Y, Vyacheslavov, L, Watanabe, KY, Watanabe, T, Watanabe, TH, Wieland, B, Yamada, I, Yamada, S, Yamamoto, S, Yanagi, N, Yasuhara, R, Yokoyama, M, Yoshida, N, Yoshimura, S, Yoshinaga, T, Yoshinuma, M & Komori, A 2013, 'Extension of operation regimes and investigation of three-dimensional currentless plasmas in the Large Helical Device', Nuclear Fusion, vol. 53, no. 10, 104015. https://doi.org/10.1088/0029-5515/53/10/104015

TY - JOUR

T1 - Extension of operation regimes and investigation of three-dimensional currentless plasmas in the Large Helical Device

AU - Kaneko, O.

AU - Yamada, H.

AU - Inagaki, S.

AU - Jakubowski, M.

AU - Kajita, S.

AU - Kitajima, S.

AU - Kobayashi,

AU - Koga, K.

AU - Morisaki, T.

AU - Morita, S.

AU - Mutoh, T.

AU - Sakakibara, S.

AU - Suzuki, Y.

AU - Takahashi, H.

AU - Tanaka, K.

AU - Toi, K.

AU - Yoshimura, Y.

AU - Akiyama, T.

AU - Asahi, Y.

AU - Ashikawa, N.

AU - Chikaraishi, H.

AU - Cooper, A.

AU - Darrow, D. S.

AU - Drapiko, E.

AU - Drewelow, P.

AU - Du, X.

AU - Ejiri, A.

AU - Emoto, M.

AU - Evans, T.

AU - Ezumi, N.

AU - Fujii, K.

AU - Fukuda, T.

AU - Funaba, H.

AU - Furukawa, M.

AU - Gates, D. A.

AU - Goto, M.

AU - Goto, T.

AU - Guttenfelder, W.

AU - Hamaguchi, S.

AU - Hasuo, M.

AU - Hino, T.

AU - Hirooka, Y.

AU - Ichiguchi, K.

AU - Ida, K.

AU - Idei, H.

AU - Ido, T.

AU - Igami, H.

AU - Ikeda, K.

AU - Imagawa, S.

AU - Imai, T.

AU - Isobe, M.

AU - Itagaki, M.

AU - Ito, T.

AU - Itoh, K.

AU - Itoh, S.

AU - Iwamoto, A.

AU - Kamiya, K.

AU - Kariya, T.

AU - Kasahara, H.

AU - Kasuya, N.

AU - Kato, D.

AU - Kato, T.

AU - Kawahata, K.

AU - Koike, F.

AU - Kubo, S.

AU - Kumazawa, R.

AU - Kuwahara, D.

AU - Lazerson, S.

AU - Lee, H.

AU - Masuzaki, S.

AU - Matsuoka, S.

AU - Matsuura, H.

AU - Matsuyama, A.

AU - Michael, C.

AU - Mikkelsen, D.

AU - Mitarai, O.

AU - Mito, T.

AU - Miyazawa, J.

AU - Motojima, G.

AU - Mukai, K.

AU - Murakami, A.

AU - Murakami, I.

AU - Murakami, S.

AU - Muroga, T.

AU - Muto, S.

AU - Nagaoka, K.

AU - Nagasaki, K.

AU - Nagayama, Y.

AU - Nakajima, N.

AU - Nakamura, H.

AU - Nakamura, Y.

AU - Nakanishi, H.

AU - Nakano, H.

AU - Nakano, T.

AU - Narihara, K.

AU - Narushima, Y.

AU - Nishimura, K.

AU - Nishimura, S.

AU - Nishiura, M.

AU - Nunami, Y. M.

AU - Obana, T.

AU - Ogawa, K.

AU - Ohdachi, S.

AU - Ohno, N.

AU - Ohyabu, N.

AU - Oishi, T.

AU - Okamoto, M.

AU - Okamoto, A.

AU - Osakabe, M.

AU - Oya, Y.

AU - Ozaki, T.

AU - Pablant, N.

AU - Peterson, B. J.

AU - Sagara, A.

AU - Saito, K.

AU - Sakamoto, R.

AU - Sakaue, H.

AU - Sasao, M.

AU - Sato, K.

AU - Sato, M.

AU - Sawada, K.

AU - Seki, R.

AU - Seki, T.

AU - Sergeev, V.

AU - Sharapov, S.

AU - Sharov, I.

AU - Shimizu, A.

AU - Shimozuma, T.

AU - Shiratani, M.

AU - Shoji, M.

AU - Sudo, S.

AU - Sugama, H.

AU - Suzuki, C.

AU - Takahata, K.

AU - Takeiri, Y.

AU - Takemura, Y.

AU - Takeuchi, M.

AU - Tamura, H.

AU - Tamura, N.

AU - Tanaka, H.

AU - Tanaka, T.

AU - Tingfeng, M.

AU - Todo, Y.

AU - Tokitani, M.

AU - Tokunaga, K.

AU - Tokuzawa, T.

AU - Tsuchiya, H.

AU - Tsumori, K.

AU - Ueda, Y.

AU - Vyacheslavov, L.

AU - Watanabe, K. Y.

AU - Watanabe, T.

AU - Watanabe, T. H.

AU - Wieland, B.

AU - Yamada, I.

AU - Yamada, S.

AU - Yamamoto, S.

AU - Yanagi, N.

AU - Yasuhara, R.

AU - Yokoyama, M.

AU - Yoshida, N.

AU - Yoshimura, S.

AU - Yoshinaga, T.

AU - Yoshinuma, M.

AU - Komori, A.

PY - 2013/10

Y1 - 2013/10

N2 - The progress of physical understanding as well as parameter improvement of net-current-free helical plasma is reported for the Large Helical Device since the last Fusion Energy Conference in Daejeon in 2010. The second low-energy neutral beam line was installed, and the central ion temperature has exceeded 7 keV, which was obtained by carbon pellet injection. Transport analysis of the high-Ti plasmas shows that the ion-thermal conductivity and viscosity decreased after the pellet injection although the improvement does not last long. The effort has been focused on the optimization of plasma edge conditions to extend the operation regime towards higher ion temperature and more stable high density and high beta. For this purpose a portion of the open helical divertors are being modified to the baffle-structured closed ones aimed at active control of the edge plasma. It is compared with the open case that the neutral pressure in the closed helical divertor increased by ten times as predicted by modelling. Studies of physics in a three-dimensional geometry are highlighted in the topics related to the response to a resonant magnetic perturbation at the plasma periphery such as edge-localized-mode mitigation and divertor detachment. Novel approaches of non-local and non-diffusive transport have also been advanced.

AB - The progress of physical understanding as well as parameter improvement of net-current-free helical plasma is reported for the Large Helical Device since the last Fusion Energy Conference in Daejeon in 2010. The second low-energy neutral beam line was installed, and the central ion temperature has exceeded 7 keV, which was obtained by carbon pellet injection. Transport analysis of the high-Ti plasmas shows that the ion-thermal conductivity and viscosity decreased after the pellet injection although the improvement does not last long. The effort has been focused on the optimization of plasma edge conditions to extend the operation regime towards higher ion temperature and more stable high density and high beta. For this purpose a portion of the open helical divertors are being modified to the baffle-structured closed ones aimed at active control of the edge plasma. It is compared with the open case that the neutral pressure in the closed helical divertor increased by ten times as predicted by modelling. Studies of physics in a three-dimensional geometry are highlighted in the topics related to the response to a resonant magnetic perturbation at the plasma periphery such as edge-localized-mode mitigation and divertor detachment. Novel approaches of non-local and non-diffusive transport have also been advanced.

UR - http://www.scopus.com/inward/record.url?scp=84884841155&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/53/10/104015

DO - 10.1088/0029-5515/53/10/104015

M3 - Article

AN - SCOPUS:84884841155

SN - 0029-5515

VL - 53

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 10

M1 - 104015

ER -

Extension of operation regimes and investigation of three-dimensional currentless plasmas in the Large Helical Device

Abstract

Funding

UN SDGs

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