Confinement characteristics of high-energy ions produced by ICRF heating in the large helical device

R. Kumazawa; K. Saito; Y. Torii; T. Mutoh; T. Seki; T. Watari; M. Osakabe; S. Murakami; M. Sasao; T. Watanabe; T. Yamamoto; T. Notake; N. Takeuchi; T. Saida; F. Shimpo; G. Nomura; M. Yokota; A. Kato; Y. Zao; H. Okada; M. Isobe; T. Ozaki; K. Narihara; Y. Nagayama; S. Inagaki; S. Morita; A. V. Krasilnikov; H. Idei; S. Kubo; K. Ohkubo; M. Sato; T. Shimozuma; Y. Yoshimura; K. Ikeda; K. Nagaoka; Y. Oka; Y. Takeiri; K. Tsumori; N. Ashikawa; M. Emoto; H. Funaba; M. Goto; K. Ida; T. Kobuchi; Y. Liang; S. Masuzaki; T. Minami; J. Miyazawa; T. Morisaki; S. Muto; Y. Nakamura; H. Nakanishi; K. Nishimura; N. Noda; S. Ohdachi; B. J. Peterson; A. Sagara; S. Sakakibara; R. Sakamoto; K. Sato; M. Shoji; H. Suzuki; K. Tanaka; K. Toi; T. Tokuzawa; K. Y. Watanabe; I. Yamada; S. Yamamoto; M. Yoshinuma; M. Yokoyama; K. Y. Watanabe; O. Kaneko; K. Kawahata; A. Komori; N. Ohyabu; H. Yamada; K. Yamazaki; S. Sudo; K. Matsuoka; Y. Hamada; O. Motojima; M. Fujiwara

doi:10.1088/0741-3335/45/6/315

Confinement characteristics of high-energy ions produced by ICRF heating in the large helical device

R. Kumazawa, K. Saito, Y. Torii, T. Mutoh, T. Seki, T. Watari, M. Osakabe, S. Murakami, M. Sasao, T. Watanabe, T. Yamamoto, T. Notake, N. Takeuchi, T. Saida, F. Shimpo, G. Nomura, M. Yokota, A. Kato, Y. Zao, H. OkadaM. Isobe, T. Ozaki, K. Narihara, Y. Nagayama, S. Inagaki, S. Morita, A. V. Krasilnikov, H. Idei, S. Kubo, K. Ohkubo, M. Sato, T. Shimozuma, Y. Yoshimura, K. Ikeda, K. Nagaoka, Y. Oka, Y. Takeiri, K. Tsumori, N. Ashikawa, M. Emoto, H. Funaba, M. Goto, K. Ida, T. Kobuchi, Y. Liang, S. Masuzaki, T. Minami, J. Miyazawa, T. Morisaki, S. Muto, Y. Nakamura, H. Nakanishi, K. Nishimura, N. Noda, S. Ohdachi, B. J. Peterson, A. Sagara, S. Sakakibara, R. Sakamoto, K. Sato, M. Shoji, H. Suzuki, K. Tanaka, K. Toi, T. Tokuzawa, K. Y. Watanabe, I. Yamada, S. Yamamoto, M. Yoshinuma, M. Yokoyama, K. Y. Watanabe, O. Kaneko, K. Kawahata, A. Komori, N. Ohyabu, H. Yamada, K. Yamazaki, S. Sudo, K. Matsuoka, Y. Hamada, O. Motojima, M. Fujiwara

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

12 Citations (Scopus)

Abstract

The behaviour of high-energy ions accelerated by an ion cyclotron range of frequency (ICRF) electric field in the large helical device (LHD) is discussed. A better confinement performance of high-energy ions in the inward-shifted magnetic axis configuration was experimentally verified by measuring their energy spectrum and comparing it with the effective temperature determined by an electron slowing down process. In the standard magnetic axis configuration a saturation of the measured tail temperature was observed as the effective temperature was increased. The ratio between these two quantities is a measure of the quality of transfer efficiency from high-energy ions to a bulk plasma; when this efficiency was compared with Monte Carlo simulations the results agreed fairly well. The ratio of the stored energy of the high-energy ions to that of the bulk plasma was measured using an ICRF heating power modulation method; it was deduced from phase differences between total and bulk plasma stored energies and the modulated ICRF heating power. The measured high energy fraction agreed with that calculated using the injected ICRF heating power, the transfer efficiency determined in the experiment and the confinement scaling of the LHD plasma.

Original language	English
Pages (from-to)	1037-1050
Number of pages	14
Journal	Plasma Physics and Controlled Fusion
Volume	45
Issue number	6
DOIs	https://doi.org/10.1088/0741-3335/45/6/315
Publication status	Published - Jun 2003
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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10.1088/0741-3335/45/6/315

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Kumazawa, R., Saito, K., Torii, Y., Mutoh, T., Seki, T., Watari, T., Osakabe, M., Murakami, S., Sasao, M., Watanabe, T., Yamamoto, T., Notake, T., Takeuchi, N., Saida, T., Shimpo, F., Nomura, G., Yokota, M., Kato, A., Zao, Y., ... Fujiwara, M. (2003). Confinement characteristics of high-energy ions produced by ICRF heating in the large helical device. Plasma Physics and Controlled Fusion, 45(6), 1037-1050. https://doi.org/10.1088/0741-3335/45/6/315

Kumazawa, R, Saito, K, Torii, Y, Mutoh, T, Seki, T, Watari, T, Osakabe, M, Murakami, S, Sasao, M, Watanabe, T, Yamamoto, T, Notake, T, Takeuchi, N, Saida, T, Shimpo, F, Nomura, G, Yokota, M, Kato, A, Zao, Y, Okada, H, Isobe, M, Ozaki, T, Narihara, K, Nagayama, Y, Inagaki, S, Morita, S, Krasilnikov, AV, Idei, H, Kubo, S, Ohkubo, K, Sato, M, Shimozuma, T, Yoshimura, Y, Ikeda, K, Nagaoka, K, Oka, Y, Takeiri, Y, Tsumori, K, Ashikawa, N, Emoto, M, Funaba, H, Goto, M, Ida, K, Kobuchi, T, Liang, Y, Masuzaki, S, Minami, T, Miyazawa, J, Morisaki, T, Muto, S, Nakamura, Y, Nakanishi, H, Nishimura, K, Noda, N, Ohdachi, S, Peterson, BJ, Sagara, A, Sakakibara, S, Sakamoto, R, Sato, K, Shoji, M, Suzuki, H, Tanaka, K, Toi, K, Tokuzawa, T, Watanabe, KY, Yamada, I, Yamamoto, S, Yoshinuma, M, Yokoyama, M, Watanabe, KY, Kaneko, O, Kawahata, K, Komori, A, Ohyabu, N, Yamada, H, Yamazaki, K, Sudo, S, Matsuoka, K, Hamada, Y, Motojima, O & Fujiwara, M 2003, 'Confinement characteristics of high-energy ions produced by ICRF heating in the large helical device', Plasma Physics and Controlled Fusion, vol. 45, no. 6, pp. 1037-1050. https://doi.org/10.1088/0741-3335/45/6/315

@article{ed4d71ac87d64503affa67491fcdf9c6,

title = "Confinement characteristics of high-energy ions produced by ICRF heating in the large helical device",

abstract = "The behaviour of high-energy ions accelerated by an ion cyclotron range of frequency (ICRF) electric field in the large helical device (LHD) is discussed. A better confinement performance of high-energy ions in the inward-shifted magnetic axis configuration was experimentally verified by measuring their energy spectrum and comparing it with the effective temperature determined by an electron slowing down process. In the standard magnetic axis configuration a saturation of the measured tail temperature was observed as the effective temperature was increased. The ratio between these two quantities is a measure of the quality of transfer efficiency from high-energy ions to a bulk plasma; when this efficiency was compared with Monte Carlo simulations the results agreed fairly well. The ratio of the stored energy of the high-energy ions to that of the bulk plasma was measured using an ICRF heating power modulation method; it was deduced from phase differences between total and bulk plasma stored energies and the modulated ICRF heating power. The measured high energy fraction agreed with that calculated using the injected ICRF heating power, the transfer efficiency determined in the experiment and the confinement scaling of the LHD plasma.",

author = "R. Kumazawa and K. Saito and Y. Torii and T. Mutoh and T. Seki and T. Watari and M. Osakabe and S. Murakami and M. Sasao and T. Watanabe and T. Yamamoto and T. Notake and N. Takeuchi and T. Saida and F. Shimpo and G. Nomura and M. Yokota and A. Kato and Y. Zao and H. Okada and M. Isobe and T. Ozaki and K. Narihara and Y. Nagayama and S. Inagaki and S. Morita and Krasilnikov, {A. V.} and H. Idei and S. Kubo and K. Ohkubo and M. Sato and T. Shimozuma and Y. Yoshimura and K. Ikeda and K. Nagaoka and Y. Oka and Y. Takeiri and K. Tsumori and N. Ashikawa and M. Emoto and H. Funaba and M. Goto and K. Ida and T. Kobuchi and Y. Liang and S. Masuzaki and T. Minami and J. Miyazawa and T. Morisaki and S. Muto and Y. Nakamura and H. Nakanishi and K. Nishimura and N. Noda and S. Ohdachi and Peterson, {B. J.} and A. Sagara and S. Sakakibara and R. Sakamoto and K. Sato and M. Shoji and H. Suzuki and K. Tanaka and K. Toi and T. Tokuzawa and Watanabe, {K. Y.} and I. Yamada and S. Yamamoto and M. Yoshinuma and M. Yokoyama and Watanabe, {K. Y.} and O. Kaneko and K. Kawahata and A. Komori and N. Ohyabu and H. Yamada and K. Yamazaki and S. Sudo and K. Matsuoka and Y. Hamada and O. Motojima and M. Fujiwara",

year = "2003",

month = jun,

doi = "10.1088/0741-3335/45/6/315",

language = "English",

volume = "45",

pages = "1037--1050",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

publisher = "IOP Publishing Ltd.",

number = "6",

}

TY - JOUR

T1 - Confinement characteristics of high-energy ions produced by ICRF heating in the large helical device

AU - Kumazawa, R.

AU - Saito, K.

AU - Torii, Y.

AU - Mutoh, T.

AU - Seki, T.

AU - Watari, T.

AU - Osakabe, M.

AU - Murakami, S.

AU - Sasao, M.

AU - Watanabe, T.

AU - Yamamoto, T.

AU - Notake, T.

AU - Takeuchi, N.

AU - Saida, T.

AU - Shimpo, F.

AU - Nomura, G.

AU - Yokota, M.

AU - Kato, A.

AU - Zao, Y.

AU - Okada, H.

AU - Isobe, M.

AU - Ozaki, T.

AU - Narihara, K.

AU - Nagayama, Y.

AU - Inagaki, S.

AU - Morita, S.

AU - Krasilnikov, A. V.

AU - Idei, H.

AU - Kubo, S.

AU - Ohkubo, K.

AU - Sato, M.

AU - Shimozuma, T.

AU - Yoshimura, Y.

AU - Ikeda, K.

AU - Nagaoka, K.

AU - Oka, Y.

AU - Takeiri, Y.

AU - Tsumori, K.

AU - Ashikawa, N.

AU - Emoto, M.

AU - Funaba, H.

AU - Goto, M.

AU - Ida, K.

AU - Kobuchi, T.

AU - Liang, Y.

AU - Masuzaki, S.

AU - Minami, T.

AU - Miyazawa, J.

AU - Morisaki, T.

AU - Muto, S.

AU - Nakamura, Y.

AU - Nakanishi, H.

AU - Nishimura, K.

AU - Noda, N.

AU - Ohdachi, S.

AU - Peterson, B. J.

AU - Sagara, A.

AU - Sakakibara, S.

AU - Sakamoto, R.

AU - Sato, K.

AU - Shoji, M.

AU - Suzuki, H.

AU - Tanaka, K.

AU - Toi, K.

AU - Tokuzawa, T.

AU - Watanabe, K. Y.

AU - Yamada, I.

AU - Yamamoto, S.

AU - Yoshinuma, M.

AU - Yokoyama, M.

AU - Watanabe, K. Y.

AU - Kaneko, O.

AU - Kawahata, K.

AU - Komori, A.

AU - Ohyabu, N.

AU - Yamada, H.

AU - Yamazaki, K.

AU - Sudo, S.

AU - Matsuoka, K.

AU - Hamada, Y.

AU - Motojima, O.

AU - Fujiwara, M.

PY - 2003/6

Y1 - 2003/6

N2 - The behaviour of high-energy ions accelerated by an ion cyclotron range of frequency (ICRF) electric field in the large helical device (LHD) is discussed. A better confinement performance of high-energy ions in the inward-shifted magnetic axis configuration was experimentally verified by measuring their energy spectrum and comparing it with the effective temperature determined by an electron slowing down process. In the standard magnetic axis configuration a saturation of the measured tail temperature was observed as the effective temperature was increased. The ratio between these two quantities is a measure of the quality of transfer efficiency from high-energy ions to a bulk plasma; when this efficiency was compared with Monte Carlo simulations the results agreed fairly well. The ratio of the stored energy of the high-energy ions to that of the bulk plasma was measured using an ICRF heating power modulation method; it was deduced from phase differences between total and bulk plasma stored energies and the modulated ICRF heating power. The measured high energy fraction agreed with that calculated using the injected ICRF heating power, the transfer efficiency determined in the experiment and the confinement scaling of the LHD plasma.

AB - The behaviour of high-energy ions accelerated by an ion cyclotron range of frequency (ICRF) electric field in the large helical device (LHD) is discussed. A better confinement performance of high-energy ions in the inward-shifted magnetic axis configuration was experimentally verified by measuring their energy spectrum and comparing it with the effective temperature determined by an electron slowing down process. In the standard magnetic axis configuration a saturation of the measured tail temperature was observed as the effective temperature was increased. The ratio between these two quantities is a measure of the quality of transfer efficiency from high-energy ions to a bulk plasma; when this efficiency was compared with Monte Carlo simulations the results agreed fairly well. The ratio of the stored energy of the high-energy ions to that of the bulk plasma was measured using an ICRF heating power modulation method; it was deduced from phase differences between total and bulk plasma stored energies and the modulated ICRF heating power. The measured high energy fraction agreed with that calculated using the injected ICRF heating power, the transfer efficiency determined in the experiment and the confinement scaling of the LHD plasma.

UR - http://www.scopus.com/inward/record.url?scp=0038480096&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0038480096&partnerID=8YFLogxK

U2 - 10.1088/0741-3335/45/6/315

DO - 10.1088/0741-3335/45/6/315

M3 - Article

AN - SCOPUS:0038480096

SN - 0741-3335

VL - 45

SP - 1037

EP - 1050

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 6

ER -

Confinement characteristics of high-energy ions produced by ICRF heating in the large helical device

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