The performance of ICRF heated plasmas in LHD

T. Watari, T. Mutoh, R. Kumazawa, T. Seki, K. Saito, Y. Torii, Yan Ping Zhao, D. Hartmann, Hiroshi Idei, S. Kubo, K. Ohkubo, M. Sato, T. Shimozuma, Y. Yoshimura, K. Ikeda, O. Kaneko, Y. Oka, M. Osakabe, Y. Takeiri, K. TsumoriN. Ashikawa, P. C. De Vries, M. Emoto, A. Fukuyama, H. Funaba, M. Goto, K. Ida, Inagaki Shigeru, N. Inoue, M. Isobe, K. Itoh, S. Kado, K. Kawahata, K. Khlopenkov, T. Kobuchi, A. Komori, A. V. Krasilnikov, Y. Liang, S. Masuzaki, K. Matsuoka, T. Minami, J. Miyazawa, T. Morisaki, S. Morita, S. Murakami, S. Muto, Y. Nagayama, Y. Nakamura, H. Nakanishi, K. Narihara, K. Nishimura, N. Noda, A. T. Notake, S. Ohdachi, N. Ohyabu, H. Okada, M. Okamoto, T. Ozaki, R. O. Pavlichenko, B. J. Peterson, A. Sagara, S. Sakakibara, R. Sakamoto, H. Sasao, M. Sasao, K. Sato, S. Satoh, T. Satow, M. Shoji, S. Sudo, H. Suzuki, M. Takechi, N. Tamura, S. Tanahashi, K. Tanaka, K. Toi, T. Tokuzawa, K. Y. Watanabe, T. Watanabe, H. Yamada, I. Yamada, S. Yamaguchi, S. Yamamoto, K. Yamazaki, M. Yokoyama, Y. Hamada, O. Motojima, M. Fujiwara

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

An ion cyclotron range of frequency (ICRF) heating experiment was conducted in the third campaign of LHD in 1999. 1.35 MW of ICRF power were injected into the plasma and 200 kJ of stored energy were obtained, which was maintained for 5 s by ICRF power only after the termination of ECH. The impurity problem was so completely overcome that the pulse length was easily extended to 68 s at a power level of 0.7 MW. The utility of a liquid stub tuner in steady state plasma heating was demonstrated in this discharge. The energy confinement time of the ICRF heated plasma has the same dependences on plasma parameters as those of the ISS95 stellarator scaling with a multiplication factor of 1.5, which is a high efficiency comparable to that of NBI. Such an improvement in performance was obtained by various means, including: (a) scanning of the magnetic field intensity and minority concentration, (b) improvement of particle orbits due to a shift of magnetic axis and (c) reduction of the number of impurity ions by means of titanium gettering and the use of carbon divertor plates. In the optimized heating regime, ion heating turned out to be the dominant heating mechanism, unlike in CHS and WT-AS. Owing to the high quality of the heating and the parameter range being extended far beyond that of previous experiments, the experiment can be regarded as the first complete demonstration of ICRF heating in stellarators.

Original languageEnglish
Pages (from-to)325-332
Number of pages8
JournalNuclear Fusion
Volume41
Issue number3
DOIs
Publication statusPublished - Mar 1 2001

Fingerprint

plasma frequencies
cyclotrons
heating
ions
stellarators
impurities
plasma heating
minorities
multiplication
magnetic flux
titanium
orbits
scaling
scanning
energy
carbon
shift
liquids
pulses

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

Cite this

Watari, T., Mutoh, T., Kumazawa, R., Seki, T., Saito, K., Torii, Y., ... Fujiwara, M. (2001). The performance of ICRF heated plasmas in LHD. Nuclear Fusion, 41(3), 325-332. https://doi.org/10.1088/0029-5515/41/3/310

The performance of ICRF heated plasmas in LHD. / Watari, T.; Mutoh, T.; Kumazawa, R.; Seki, T.; Saito, K.; Torii, Y.; Zhao, Yan Ping; Hartmann, D.; Idei, Hiroshi; Kubo, S.; Ohkubo, K.; Sato, M.; Shimozuma, T.; Yoshimura, Y.; Ikeda, K.; Kaneko, O.; Oka, Y.; Osakabe, M.; Takeiri, Y.; Tsumori, K.; Ashikawa, N.; De Vries, P. C.; Emoto, M.; Fukuyama, A.; Funaba, H.; Goto, M.; Ida, K.; Shigeru, Inagaki; Inoue, N.; Isobe, M.; Itoh, K.; Kado, S.; Kawahata, K.; Khlopenkov, K.; Kobuchi, T.; Komori, A.; Krasilnikov, A. V.; Liang, Y.; Masuzaki, S.; Matsuoka, K.; Minami, T.; Miyazawa, J.; Morisaki, T.; Morita, S.; Murakami, S.; Muto, S.; Nagayama, Y.; Nakamura, Y.; Nakanishi, H.; Narihara, K.; Nishimura, K.; Noda, N.; Notake, A. T.; Ohdachi, S.; Ohyabu, N.; Okada, H.; Okamoto, M.; Ozaki, T.; Pavlichenko, R. O.; Peterson, B. J.; Sagara, A.; Sakakibara, S.; Sakamoto, R.; Sasao, H.; Sasao, M.; Sato, K.; Satoh, S.; Satow, T.; Shoji, M.; Sudo, S.; Suzuki, H.; Takechi, M.; Tamura, N.; Tanahashi, S.; Tanaka, K.; Toi, K.; Tokuzawa, T.; Watanabe, K. Y.; Watanabe, T.; Yamada, H.; Yamada, I.; Yamaguchi, S.; Yamamoto, S.; Yamazaki, K.; Yokoyama, M.; Hamada, Y.; Motojima, O.; Fujiwara, M.

In: Nuclear Fusion, Vol. 41, No. 3, 01.03.2001, p. 325-332.

Research output: Contribution to journalArticle

Watari, T, Mutoh, T, Kumazawa, R, Seki, T, Saito, K, Torii, Y, Zhao, YP, Hartmann, D, Idei, H, Kubo, S, Ohkubo, K, Sato, M, Shimozuma, T, Yoshimura, Y, Ikeda, K, Kaneko, O, Oka, Y, Osakabe, M, Takeiri, Y, Tsumori, K, Ashikawa, N, De Vries, PC, Emoto, M, Fukuyama, A, Funaba, H, Goto, M, Ida, K, Shigeru, I, Inoue, N, Isobe, M, Itoh, K, Kado, S, Kawahata, K, Khlopenkov, K, Kobuchi, T, Komori, A, Krasilnikov, AV, Liang, Y, Masuzaki, S, Matsuoka, K, Minami, T, Miyazawa, J, Morisaki, T, Morita, S, Murakami, S, Muto, S, Nagayama, Y, Nakamura, Y, Nakanishi, H, Narihara, K, Nishimura, K, Noda, N, Notake, AT, Ohdachi, S, Ohyabu, N, Okada, H, Okamoto, M, Ozaki, T, Pavlichenko, RO, Peterson, BJ, Sagara, A, Sakakibara, S, Sakamoto, R, Sasao, H, Sasao, M, Sato, K, Satoh, S, Satow, T, Shoji, M, Sudo, S, Suzuki, H, Takechi, M, Tamura, N, Tanahashi, S, Tanaka, K, Toi, K, Tokuzawa, T, Watanabe, KY, Watanabe, T, Yamada, H, Yamada, I, Yamaguchi, S, Yamamoto, S, Yamazaki, K, Yokoyama, M, Hamada, Y, Motojima, O & Fujiwara, M 2001, 'The performance of ICRF heated plasmas in LHD', Nuclear Fusion, vol. 41, no. 3, pp. 325-332. https://doi.org/10.1088/0029-5515/41/3/310
Watari T, Mutoh T, Kumazawa R, Seki T, Saito K, Torii Y et al. The performance of ICRF heated plasmas in LHD. Nuclear Fusion. 2001 Mar 1;41(3):325-332. https://doi.org/10.1088/0029-5515/41/3/310
Watari, T. ; Mutoh, T. ; Kumazawa, R. ; Seki, T. ; Saito, K. ; Torii, Y. ; Zhao, Yan Ping ; Hartmann, D. ; Idei, Hiroshi ; Kubo, S. ; Ohkubo, K. ; Sato, M. ; Shimozuma, T. ; Yoshimura, Y. ; Ikeda, K. ; Kaneko, O. ; Oka, Y. ; Osakabe, M. ; Takeiri, Y. ; Tsumori, K. ; Ashikawa, N. ; De Vries, P. C. ; Emoto, M. ; Fukuyama, A. ; Funaba, H. ; Goto, M. ; Ida, K. ; Shigeru, Inagaki ; Inoue, N. ; Isobe, M. ; Itoh, K. ; Kado, S. ; Kawahata, K. ; Khlopenkov, K. ; Kobuchi, T. ; Komori, A. ; Krasilnikov, A. V. ; Liang, Y. ; Masuzaki, S. ; Matsuoka, K. ; Minami, T. ; Miyazawa, J. ; Morisaki, T. ; Morita, S. ; Murakami, S. ; Muto, S. ; Nagayama, Y. ; Nakamura, Y. ; Nakanishi, H. ; Narihara, K. ; Nishimura, K. ; Noda, N. ; Notake, A. T. ; Ohdachi, S. ; Ohyabu, N. ; Okada, H. ; Okamoto, M. ; Ozaki, T. ; Pavlichenko, R. O. ; Peterson, B. J. ; Sagara, A. ; Sakakibara, S. ; Sakamoto, R. ; Sasao, H. ; Sasao, M. ; Sato, K. ; Satoh, S. ; Satow, T. ; Shoji, M. ; Sudo, S. ; Suzuki, H. ; Takechi, M. ; Tamura, N. ; Tanahashi, S. ; Tanaka, K. ; Toi, K. ; Tokuzawa, T. ; Watanabe, K. Y. ; Watanabe, T. ; Yamada, H. ; Yamada, I. ; Yamaguchi, S. ; Yamamoto, S. ; Yamazaki, K. ; Yokoyama, M. ; Hamada, Y. ; Motojima, O. ; Fujiwara, M. / The performance of ICRF heated plasmas in LHD. In: Nuclear Fusion. 2001 ; Vol. 41, No. 3. pp. 325-332.
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abstract = "An ion cyclotron range of frequency (ICRF) heating experiment was conducted in the third campaign of LHD in 1999. 1.35 MW of ICRF power were injected into the plasma and 200 kJ of stored energy were obtained, which was maintained for 5 s by ICRF power only after the termination of ECH. The impurity problem was so completely overcome that the pulse length was easily extended to 68 s at a power level of 0.7 MW. The utility of a liquid stub tuner in steady state plasma heating was demonstrated in this discharge. The energy confinement time of the ICRF heated plasma has the same dependences on plasma parameters as those of the ISS95 stellarator scaling with a multiplication factor of 1.5, which is a high efficiency comparable to that of NBI. Such an improvement in performance was obtained by various means, including: (a) scanning of the magnetic field intensity and minority concentration, (b) improvement of particle orbits due to a shift of magnetic axis and (c) reduction of the number of impurity ions by means of titanium gettering and the use of carbon divertor plates. In the optimized heating regime, ion heating turned out to be the dominant heating mechanism, unlike in CHS and WT-AS. Owing to the high quality of the heating and the parameter range being extended far beyond that of previous experiments, the experiment can be regarded as the first complete demonstration of ICRF heating in stellarators.",
author = "T. Watari and T. Mutoh and R. Kumazawa and T. Seki and K. Saito and Y. Torii and Zhao, {Yan Ping} and D. Hartmann and Hiroshi Idei and S. Kubo and K. Ohkubo and M. Sato and T. Shimozuma and Y. Yoshimura and K. Ikeda and O. Kaneko and Y. Oka and M. Osakabe and Y. Takeiri and K. Tsumori and N. Ashikawa and {De Vries}, {P. C.} and M. Emoto and A. Fukuyama and H. Funaba and M. Goto and K. Ida and Inagaki Shigeru and N. Inoue and M. Isobe and K. Itoh and S. Kado and K. Kawahata and K. Khlopenkov and T. Kobuchi and A. Komori and Krasilnikov, {A. V.} and Y. Liang and S. Masuzaki and K. Matsuoka and T. Minami and J. Miyazawa and T. Morisaki and S. Morita and S. Murakami and S. Muto and Y. Nagayama and Y. Nakamura and H. Nakanishi and K. Narihara and K. Nishimura and N. Noda and Notake, {A. T.} and S. Ohdachi and N. Ohyabu and H. Okada and M. Okamoto and T. Ozaki and Pavlichenko, {R. O.} and Peterson, {B. J.} and A. Sagara and S. Sakakibara and R. Sakamoto and H. Sasao and M. Sasao and K. Sato and S. Satoh and T. Satow and M. Shoji and S. Sudo and H. Suzuki and M. Takechi and N. Tamura and S. Tanahashi and K. Tanaka and K. Toi and T. Tokuzawa and Watanabe, {K. Y.} and T. Watanabe and H. Yamada and I. Yamada and S. Yamaguchi and S. Yamamoto and K. Yamazaki and M. Yokoyama and Y. Hamada and O. Motojima and M. Fujiwara",
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TY - JOUR

T1 - The performance of ICRF heated plasmas in LHD

AU - Watari, T.

AU - Mutoh, T.

AU - Kumazawa, R.

AU - Seki, T.

AU - Saito, K.

AU - Torii, Y.

AU - Zhao, Yan Ping

AU - Hartmann, D.

AU - Idei, Hiroshi

AU - Kubo, S.

AU - Ohkubo, K.

AU - Sato, M.

AU - Shimozuma, T.

AU - Yoshimura, Y.

AU - Ikeda, K.

AU - Kaneko, O.

AU - Oka, Y.

AU - Osakabe, M.

AU - Takeiri, Y.

AU - Tsumori, K.

AU - Ashikawa, N.

AU - De Vries, P. C.

AU - Emoto, M.

AU - Fukuyama, A.

AU - Funaba, H.

AU - Goto, M.

AU - Ida, K.

AU - Shigeru, Inagaki

AU - Inoue, N.

AU - Isobe, M.

AU - Itoh, K.

AU - Kado, S.

AU - Kawahata, K.

AU - Khlopenkov, K.

AU - Kobuchi, T.

AU - Komori, A.

AU - Krasilnikov, A. V.

AU - Liang, Y.

AU - Masuzaki, S.

AU - Matsuoka, K.

AU - Minami, T.

AU - Miyazawa, J.

AU - Morisaki, T.

AU - Morita, S.

AU - Murakami, S.

AU - Muto, S.

AU - Nagayama, Y.

AU - Nakamura, Y.

AU - Nakanishi, H.

AU - Narihara, K.

AU - Nishimura, K.

AU - Noda, N.

AU - Notake, A. T.

AU - Ohdachi, S.

AU - Ohyabu, N.

AU - Okada, H.

AU - Okamoto, M.

AU - Ozaki, T.

AU - Pavlichenko, R. O.

AU - Peterson, B. J.

AU - Sagara, A.

AU - Sakakibara, S.

AU - Sakamoto, R.

AU - Sasao, H.

AU - Sasao, M.

AU - Sato, K.

AU - Satoh, S.

AU - Satow, T.

AU - Shoji, M.

AU - Sudo, S.

AU - Suzuki, H.

AU - Takechi, M.

AU - Tamura, N.

AU - Tanahashi, S.

AU - Tanaka, K.

AU - Toi, K.

AU - Tokuzawa, T.

AU - Watanabe, K. Y.

AU - Watanabe, T.

AU - Yamada, H.

AU - Yamada, I.

AU - Yamaguchi, S.

AU - Yamamoto, S.

AU - Yamazaki, K.

AU - Yokoyama, M.

AU - Hamada, Y.

AU - Motojima, O.

AU - Fujiwara, M.

PY - 2001/3/1

Y1 - 2001/3/1

N2 - An ion cyclotron range of frequency (ICRF) heating experiment was conducted in the third campaign of LHD in 1999. 1.35 MW of ICRF power were injected into the plasma and 200 kJ of stored energy were obtained, which was maintained for 5 s by ICRF power only after the termination of ECH. The impurity problem was so completely overcome that the pulse length was easily extended to 68 s at a power level of 0.7 MW. The utility of a liquid stub tuner in steady state plasma heating was demonstrated in this discharge. The energy confinement time of the ICRF heated plasma has the same dependences on plasma parameters as those of the ISS95 stellarator scaling with a multiplication factor of 1.5, which is a high efficiency comparable to that of NBI. Such an improvement in performance was obtained by various means, including: (a) scanning of the magnetic field intensity and minority concentration, (b) improvement of particle orbits due to a shift of magnetic axis and (c) reduction of the number of impurity ions by means of titanium gettering and the use of carbon divertor plates. In the optimized heating regime, ion heating turned out to be the dominant heating mechanism, unlike in CHS and WT-AS. Owing to the high quality of the heating and the parameter range being extended far beyond that of previous experiments, the experiment can be regarded as the first complete demonstration of ICRF heating in stellarators.

AB - An ion cyclotron range of frequency (ICRF) heating experiment was conducted in the third campaign of LHD in 1999. 1.35 MW of ICRF power were injected into the plasma and 200 kJ of stored energy were obtained, which was maintained for 5 s by ICRF power only after the termination of ECH. The impurity problem was so completely overcome that the pulse length was easily extended to 68 s at a power level of 0.7 MW. The utility of a liquid stub tuner in steady state plasma heating was demonstrated in this discharge. The energy confinement time of the ICRF heated plasma has the same dependences on plasma parameters as those of the ISS95 stellarator scaling with a multiplication factor of 1.5, which is a high efficiency comparable to that of NBI. Such an improvement in performance was obtained by various means, including: (a) scanning of the magnetic field intensity and minority concentration, (b) improvement of particle orbits due to a shift of magnetic axis and (c) reduction of the number of impurity ions by means of titanium gettering and the use of carbon divertor plates. In the optimized heating regime, ion heating turned out to be the dominant heating mechanism, unlike in CHS and WT-AS. Owing to the high quality of the heating and the parameter range being extended far beyond that of previous experiments, the experiment can be regarded as the first complete demonstration of ICRF heating in stellarators.

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