A study of high-energy ions produced by ICRF heating in LHD

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

doi:10.1088/0741-3335/44/1/309

A study of high-energy ions produced by ICRF heating in LHD

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

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Abstract

This paper reports on the behaviour of high-energy ions created by ion cyclotron range of frequency (ICRF) heating on the Large Helical Device (LHD). In the third experimental campaign conducted in 1999, it was found that minority heating has good heating performance, and high-energy particles were observed. In the fourth campaign in 2000, the temporal behaviour of high-energy ions was investigated in the minority heating regime using turnoff or modulation of ICRF power. The time evolution of the high-energy particle distribution was measured using a natural diamond detector (NDD) and a time-of-flight neutral particle analyser (TOF-NPA). It was found that the count number of higher-energy particles declines faster than that of lower-energy particles after ICRF turnoff. In the modulation experiments, the phase difference of the flux of high-energy particles with respect to the ICRF power modulation increased with energy. These results were explained qualitatively by the Fokker-Planck equation with a simple model. The pitch-angle dependence of the distribution function was also measured in the experiment by changing the line of sight of the TOF-NPA, and an anisotropy of the high-energy tail was found. This anisotropy was reproduced by solving the bounce-averaged Fokker-Planck equation. The second harmonic heating was conducted successfully for the first time in the LHD in high-β plasma, and high-energy particles were also detected in this heating regime.

Original language	English
Pages (from-to)	103-119
Number of pages	17
Journal	Plasma Physics and Controlled Fusion
Volume	44
Issue number	1
DOIs	https://doi.org/10.1088/0741-3335/44/1/309
Publication status	Published - Jan 2002
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear Energy and Engineering
Condensed Matter Physics

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10.1088/0741-3335/44/1/309

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Saito, K., Kumazawa, R., Mutoh, T., Seki, T., Watari, T., Yamamoto, T., Torii, Y., Takeuchi, N., Zhang, C., Zhao, Y., Fukuyama, A., Shimpo, F., Nomura, G., Yokota, M., Kato, A., Sasao, M., Isobe, M., Krasilnikov, A. V., Ozaki, T., ... Fujiwara, M. (2002). A study of high-energy ions produced by ICRF heating in LHD. Plasma Physics and Controlled Fusion, 44(1), 103-119. https://doi.org/10.1088/0741-3335/44/1/309

Saito, K, Kumazawa, R, Mutoh, T, Seki, T, Watari, T, Yamamoto, T, Torii, Y, Takeuchi, N, Zhang, C, Zhao, Y, Fukuyama, A, Shimpo, F, Nomura, G, Yokota, M, Kato, A, Sasao, M, Isobe, M, Krasilnikov, AV, Ozaki, T, Osakabe, M, Narihara, K, Nagayama, Y, Inagaki, S, Itoh, K, Ido, T, Morita, S, Ohkubo, K, Sato, M, Kubo, S, Shimozuma, T, Idei, H, Yoshimura, Y, Notake, T, Kaneko, O, Takeiri, Y, Oka, Y, Tsumori, K, Ikeda, K, Komori, A, Yamada, H, Funaba, H, Watanabe, KY, Sakakibara, S, Sakamoto, R, Miyazawa, J, Tanaka, K, Peterson, BJ, Ashikawa, N, Murakami, S, Minami, T, Shoji, M, Ohdachi, S, Yamamoto, S, Suzuki, H, Kawahata, K, Emoto, M, Nakanishi, H, Inoue, N, Ohyabu, N, Nakamura, Y, Masuzaki, S, Muto, S, Sato, K, Morisaki, T, Yokoyama, M, Watanabe, T, Goto, M, Yamada, I, Ida, K, Tokuzawa, T, Noda, N, Toi, K, Yamaguchi, S, Akaishi, K, Sagara, A, Nishimura, K, Yamazaki, K, Sudo, S, Hamada, Y, Motojima, O & Fujiwara, M 2002, 'A study of high-energy ions produced by ICRF heating in LHD', Plasma Physics and Controlled Fusion, vol. 44, no. 1, pp. 103-119. https://doi.org/10.1088/0741-3335/44/1/309

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title = "A study of high-energy ions produced by ICRF heating in LHD",

abstract = "This paper reports on the behaviour of high-energy ions created by ion cyclotron range of frequency (ICRF) heating on the Large Helical Device (LHD). In the third experimental campaign conducted in 1999, it was found that minority heating has good heating performance, and high-energy particles were observed. In the fourth campaign in 2000, the temporal behaviour of high-energy ions was investigated in the minority heating regime using turnoff or modulation of ICRF power. The time evolution of the high-energy particle distribution was measured using a natural diamond detector (NDD) and a time-of-flight neutral particle analyser (TOF-NPA). It was found that the count number of higher-energy particles declines faster than that of lower-energy particles after ICRF turnoff. In the modulation experiments, the phase difference of the flux of high-energy particles with respect to the ICRF power modulation increased with energy. These results were explained qualitatively by the Fokker-Planck equation with a simple model. The pitch-angle dependence of the distribution function was also measured in the experiment by changing the line of sight of the TOF-NPA, and an anisotropy of the high-energy tail was found. This anisotropy was reproduced by solving the bounce-averaged Fokker-Planck equation. The second harmonic heating was conducted successfully for the first time in the LHD in high-β plasma, and high-energy particles were also detected in this heating regime.",

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

year = "2002",

month = jan,

doi = "10.1088/0741-3335/44/1/309",

language = "English",

volume = "44",

pages = "103--119",

journal = "Plasma Physics and Controlled Fusion",

issn = "0741-3335",

publisher = "IOP Publishing Ltd.",

number = "1",

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TY - JOUR

T1 - A study of high-energy ions produced by ICRF heating in LHD

AU - Saito, K.

AU - Kumazawa, R.

AU - Mutoh, T.

AU - Seki, T.

AU - Watari, T.

AU - Yamamoto, T.

AU - Torii, Y.

AU - Takeuchi, N.

AU - Zhang, C.

AU - Zhao, Y.

AU - Fukuyama, A.

AU - Shimpo, F.

AU - Nomura, G.

AU - Yokota, M.

AU - Kato, A.

AU - Sasao, M.

AU - Isobe, M.

AU - Krasilnikov, A. V.

AU - Ozaki, T.

AU - Osakabe, M.

AU - Narihara, K.

AU - Nagayama, Y.

AU - Inagaki, S.

AU - Itoh, K.

AU - Ido, T.

AU - Morita, S.

AU - Ohkubo, K.

AU - Sato, M.

AU - Kubo, S.

AU - Shimozuma, T.

AU - Idei, H.

AU - Yoshimura, Y.

AU - Notake, T.

AU - Kaneko, O.

AU - Takeiri, Y.

AU - Oka, Y.

AU - Tsumori, K.

AU - Ikeda, K.

AU - Komori, A.

AU - Yamada, H.

AU - Funaba, H.

AU - Watanabe, K. Y.

AU - Sakakibara, S.

AU - Sakamoto, R.

AU - Miyazawa, J.

AU - Tanaka, K.

AU - Peterson, B. J.

AU - Ashikawa, N.

AU - Murakami, S.

AU - Minami, T.

AU - Shoji, M.

AU - Ohdachi, S.

AU - Yamamoto, S.

AU - Suzuki, H.

AU - Kawahata, K.

AU - Emoto, M.

AU - Nakanishi, H.

AU - Inoue, N.

AU - Ohyabu, N.

AU - Nakamura, Y.

AU - Masuzaki, S.

AU - Muto, S.

AU - Sato, K.

AU - Morisaki, T.

AU - Yokoyama, M.

AU - Watanabe, T.

AU - Goto, M.

AU - Yamada, I.

AU - Ida, K.

AU - Tokuzawa, T.

AU - Noda, N.

AU - Toi, K.

AU - Yamaguchi, S.

AU - Akaishi, K.

AU - Sagara, A.

AU - Nishimura, K.

AU - Yamazaki, K.

AU - Sudo, S.

AU - Hamada, Y.

AU - Motojima, O.

AU - Fujiwara, M.

PY - 2002/1

Y1 - 2002/1

N2 - This paper reports on the behaviour of high-energy ions created by ion cyclotron range of frequency (ICRF) heating on the Large Helical Device (LHD). In the third experimental campaign conducted in 1999, it was found that minority heating has good heating performance, and high-energy particles were observed. In the fourth campaign in 2000, the temporal behaviour of high-energy ions was investigated in the minority heating regime using turnoff or modulation of ICRF power. The time evolution of the high-energy particle distribution was measured using a natural diamond detector (NDD) and a time-of-flight neutral particle analyser (TOF-NPA). It was found that the count number of higher-energy particles declines faster than that of lower-energy particles after ICRF turnoff. In the modulation experiments, the phase difference of the flux of high-energy particles with respect to the ICRF power modulation increased with energy. These results were explained qualitatively by the Fokker-Planck equation with a simple model. The pitch-angle dependence of the distribution function was also measured in the experiment by changing the line of sight of the TOF-NPA, and an anisotropy of the high-energy tail was found. This anisotropy was reproduced by solving the bounce-averaged Fokker-Planck equation. The second harmonic heating was conducted successfully for the first time in the LHD in high-β plasma, and high-energy particles were also detected in this heating regime.

AB - This paper reports on the behaviour of high-energy ions created by ion cyclotron range of frequency (ICRF) heating on the Large Helical Device (LHD). In the third experimental campaign conducted in 1999, it was found that minority heating has good heating performance, and high-energy particles were observed. In the fourth campaign in 2000, the temporal behaviour of high-energy ions was investigated in the minority heating regime using turnoff or modulation of ICRF power. The time evolution of the high-energy particle distribution was measured using a natural diamond detector (NDD) and a time-of-flight neutral particle analyser (TOF-NPA). It was found that the count number of higher-energy particles declines faster than that of lower-energy particles after ICRF turnoff. In the modulation experiments, the phase difference of the flux of high-energy particles with respect to the ICRF power modulation increased with energy. These results were explained qualitatively by the Fokker-Planck equation with a simple model. The pitch-angle dependence of the distribution function was also measured in the experiment by changing the line of sight of the TOF-NPA, and an anisotropy of the high-energy tail was found. This anisotropy was reproduced by solving the bounce-averaged Fokker-Planck equation. The second harmonic heating was conducted successfully for the first time in the LHD in high-β plasma, and high-energy particles were also detected in this heating regime.

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U2 - 10.1088/0741-3335/44/1/309

DO - 10.1088/0741-3335/44/1/309

M3 - Article

AN - SCOPUS:0036147837

SN - 0741-3335

VL - 44

SP - 103

EP - 119

JO - Plasma Physics and Controlled Fusion

JF - Plasma Physics and Controlled Fusion

IS - 1

ER -

A study of high-energy ions produced by ICRF heating in LHD

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