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; H. Idei; S. Kubo; K. Ohkubo; M. Sato; T. Shimozuma; Y. Yoshimura; K. Ikeda; O. Kaneko; Y. Oka; M. Osakabe; Y. Takeiri; K. Tsumori; N. 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

doi:10.1088/0029-5515/41/3/310

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, H. 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

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15 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 language	English
Pages (from-to)	325-332
Number of pages	8
Journal	Nuclear Fusion
Volume	41
Issue number	3
DOIs	https://doi.org/10.1088/0029-5515/41/3/310
Publication status	Published - Mar 1 2001
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Condensed Matter Physics

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10.1088/0029-5515/41/3/310

Cite this

Watari, T., Mutoh, T., Kumazawa, R., Seki, T., Saito, K., Torii, Y., Zhao, Y. P., Hartmann, D., Idei, H., Kubo, S., Ohkubo, K., Sato, M., Shimozuma, T., Yoshimura, Y., Ikeda, K., Kaneko, O., Oka, Y., Osakabe, M., Takeiri, 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

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

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title = "The performance of ICRF heated plasmas in LHD",

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 H. 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",

year = "2001",

month = mar,

day = "1",

doi = "10.1088/0029-5515/41/3/310",

language = "English",

volume = "41",

pages = "325--332",

journal = "Nuclear Fusion",

issn = "0029-5515",

publisher = "IOP Publishing Ltd.",

number = "3",

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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, H.

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.

UR - http://www.scopus.com/inward/record.url?scp=0035296970&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035296970&partnerID=8YFLogxK

U2 - 10.1088/0029-5515/41/3/310

DO - 10.1088/0029-5515/41/3/310

M3 - Article

AN - SCOPUS:0035296970

SN - 0029-5515

VL - 41

SP - 325

EP - 332

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 3

ER -

The performance of ICRF heated plasmas in LHD

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