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 & 61 others K. Narihara, Y. Nagayama, Inagaki Shigeru, K. Itoh, T. Ido, S. Morita, K. Ohkubo, M. Sato, S. Kubo, T. Shimozuma, Hiroshi 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

Research output: Contribution to journalArticle

16 Citations (Scopus)

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 languageEnglish
Pages (from-to)103-119
Number of pages17
JournalPlasma Physics and Controlled Fusion
Volume44
Issue number1
DOIs
Publication statusPublished - Jan 1 2002

Fingerprint

Cyclotrons
particle energy
cyclotrons
Heating
heating
Ions
Fokker Planck equation
ions
neutral particles
Modulation
Fokker-Planck equation
minorities
modulation
energy
Anisotropy
anisotropy
pitch (inclination)
line of sight
Distribution functions
Diamonds

All Science Journal Classification (ASJC) codes

  • Nuclear Energy and Engineering
  • Condensed Matter Physics

Cite this

Saito, K., Kumazawa, R., Mutoh, T., Seki, T., Watari, T., Yamamoto, 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

A study of high-energy ions produced by ICRF heating in LHD. / 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.; Osakabe, M.; Narihara, K.; Nagayama, Y.; Shigeru, Inagaki; Itoh, K.; Ido, T.; Morita, S.; Ohkubo, K.; Sato, M.; Kubo, S.; Shimozuma, T.; Idei, Hiroshi; Yoshimura, Y.; Notake, T.; Kaneko, O.; Takeiri, Y.; Oka, Y.; Tsumori, K.; Ikeda, K.; Komori, A.; Yamada, H.; Funaba, H.; Watanabe, K. Y.; Sakakibara, S.; Sakamoto, R.; Miyazawa, J.; Tanaka, K.; Peterson, B. J.; 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.

In: Plasma Physics and Controlled Fusion, Vol. 44, No. 1, 01.01.2002, p. 103-119.

Research output: Contribution to journalArticle

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, Shigeru, I, 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
Saito K, Kumazawa R, Mutoh T, Seki T, Watari T, Yamamoto T et al. A study of high-energy ions produced by ICRF heating in LHD. Plasma Physics and Controlled Fusion. 2002 Jan 1;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, A. V. ; Ozaki, T. ; Osakabe, M. ; Narihara, K. ; Nagayama, Y. ; Shigeru, Inagaki ; Itoh, K. ; Ido, T. ; Morita, S. ; Ohkubo, K. ; Sato, M. ; Kubo, S. ; Shimozuma, T. ; Idei, Hiroshi ; Yoshimura, Y. ; Notake, T. ; Kaneko, O. ; Takeiri, Y. ; Oka, Y. ; Tsumori, K. ; Ikeda, K. ; Komori, A. ; Yamada, H. ; Funaba, H. ; Watanabe, K. Y. ; Sakakibara, S. ; Sakamoto, R. ; Miyazawa, J. ; Tanaka, K. ; Peterson, B. J. ; 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. / A study of high-energy ions produced by ICRF heating in LHD. In: Plasma Physics and Controlled Fusion. 2002 ; Vol. 44, No. 1. pp. 103-119.
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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.",
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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 - Shigeru, Inagaki

AU - Itoh, K.

AU - Ido, T.

AU - Morita, S.

AU - Ohkubo, K.

AU - Sato, M.

AU - Kubo, S.

AU - Shimozuma, T.

AU - Idei, Hiroshi

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 - 2002/1/1

Y1 - 2002/1/1

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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