Development of gyrotrons for fusion with power exceeding 1 MW over a wide frequency range

T. Kariya, T. Imai, R. Minami, T. Numakura, T. Eguchi, T. Kato, Y. Endo, M. Ichimura, T. Shimozuma, S. Kubo, H. Takahashi, Y. Yoshimura, H. Igami, S. Ito, T. Mutoh, K. Sakamoto, Hiroshi Idei, H. Zushi, K. Nagasaki, F. Sano & 2 others M. Ono, Y. Mitsunaka

    Research output: Contribution to journalArticle

    10 Citations (Scopus)

    Abstract

    Megawatt-class gyrotrons covering a wide frequency range (14 GHz-300 GHz) are in increasing demand for nuclear fusion. Recent electron cyclotron heating and electron cyclotron current drive experiments highlight a requirement of megawatt-scale gyrotrons at a relatively lower frequency (14-35 GHz) range of some plasma devices, like GAMMA 10/PDX of the University of Tsukuba, QUEST of Kyushu University, NSTX-U of Princeton Plasma Physics Laboratory, and Heliotron J of Kyoto University. Collaborative studies for designing a new 28 GHz/35 GHz dual-frequency gyrotron and a 14 GHz gyrotron have commenced. Operation above 1 MW of 28 GHz/35 GHz dual oscillation was demonstrated experimentally. Further in the design of dual-frequency gyrotron, operations with 2 MW 3 s and 0.4 MW CW (continuous wave) at 28 GHz, and power exceeding 1 MW for 3 s at 34.8 GHz have been shown to be feasible. The 14 GHz gyrotron is expected to operate above 1 MW. We are also developing higher frequency gyrotrons (77-300 GHz). The joint program of National Institute for Fusion Science and the University of Tsukuba developed two new 154 GHz gyrotrons for the large helical device after the demonstration of three 77 GHz gyrotrons. The 154 GHz gyrotrons achieved a maximum output power of 1.25 MW and quasi-CW operation of 0.35 MW for 30 min.

    Original languageEnglish
    Article number093009
    JournalNuclear Fusion
    Volume55
    Issue number9
    DOIs
    Publication statusPublished - Aug 5 2015

    Fingerprint

    cyclotron resonance devices
    fusion
    frequency ranges
    continuous radiation
    electron cyclotron heating
    plasma physics
    nuclear fusion
    cyclotrons
    coverings
    low frequencies
    requirements
    oscillations
    output
    electrons

    All Science Journal Classification (ASJC) codes

    • Nuclear and High Energy Physics
    • Condensed Matter Physics

    Cite this

    Kariya, T., Imai, T., Minami, R., Numakura, T., Eguchi, T., Kato, T., ... Mitsunaka, Y. (2015). Development of gyrotrons for fusion with power exceeding 1 MW over a wide frequency range. Nuclear Fusion, 55(9), [093009]. https://doi.org/10.1088/0029-5515/55/9/093009

    Development of gyrotrons for fusion with power exceeding 1 MW over a wide frequency range. / Kariya, T.; Imai, T.; Minami, R.; Numakura, T.; Eguchi, T.; Kato, T.; Endo, Y.; Ichimura, M.; Shimozuma, T.; Kubo, S.; Takahashi, H.; Yoshimura, Y.; Igami, H.; Ito, S.; Mutoh, T.; Sakamoto, K.; Idei, Hiroshi; Zushi, H.; Nagasaki, K.; Sano, F.; Ono, M.; Mitsunaka, Y.

    In: Nuclear Fusion, Vol. 55, No. 9, 093009, 05.08.2015.

    Research output: Contribution to journalArticle

    Kariya, T, Imai, T, Minami, R, Numakura, T, Eguchi, T, Kato, T, Endo, Y, Ichimura, M, Shimozuma, T, Kubo, S, Takahashi, H, Yoshimura, Y, Igami, H, Ito, S, Mutoh, T, Sakamoto, K, Idei, H, Zushi, H, Nagasaki, K, Sano, F, Ono, M & Mitsunaka, Y 2015, 'Development of gyrotrons for fusion with power exceeding 1 MW over a wide frequency range', Nuclear Fusion, vol. 55, no. 9, 093009. https://doi.org/10.1088/0029-5515/55/9/093009
    Kariya, T. ; Imai, T. ; Minami, R. ; Numakura, T. ; Eguchi, T. ; Kato, T. ; Endo, Y. ; Ichimura, M. ; Shimozuma, T. ; Kubo, S. ; Takahashi, H. ; Yoshimura, Y. ; Igami, H. ; Ito, S. ; Mutoh, T. ; Sakamoto, K. ; Idei, Hiroshi ; Zushi, H. ; Nagasaki, K. ; Sano, F. ; Ono, M. ; Mitsunaka, Y. / Development of gyrotrons for fusion with power exceeding 1 MW over a wide frequency range. In: Nuclear Fusion. 2015 ; Vol. 55, No. 9.
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    abstract = "Megawatt-class gyrotrons covering a wide frequency range (14 GHz-300 GHz) are in increasing demand for nuclear fusion. Recent electron cyclotron heating and electron cyclotron current drive experiments highlight a requirement of megawatt-scale gyrotrons at a relatively lower frequency (14-35 GHz) range of some plasma devices, like GAMMA 10/PDX of the University of Tsukuba, QUEST of Kyushu University, NSTX-U of Princeton Plasma Physics Laboratory, and Heliotron J of Kyoto University. Collaborative studies for designing a new 28 GHz/35 GHz dual-frequency gyrotron and a 14 GHz gyrotron have commenced. Operation above 1 MW of 28 GHz/35 GHz dual oscillation was demonstrated experimentally. Further in the design of dual-frequency gyrotron, operations with 2 MW 3 s and 0.4 MW CW (continuous wave) at 28 GHz, and power exceeding 1 MW for 3 s at 34.8 GHz have been shown to be feasible. The 14 GHz gyrotron is expected to operate above 1 MW. We are also developing higher frequency gyrotrons (77-300 GHz). The joint program of National Institute for Fusion Science and the University of Tsukuba developed two new 154 GHz gyrotrons for the large helical device after the demonstration of three 77 GHz gyrotrons. The 154 GHz gyrotrons achieved a maximum output power of 1.25 MW and quasi-CW operation of 0.35 MW for 30 min.",
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    AU - Ichimura, M.

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    AU - Takahashi, H.

    AU - Yoshimura, Y.

    AU - Igami, H.

    AU - Ito, S.

    AU - Mutoh, T.

    AU - Sakamoto, K.

    AU - Idei, Hiroshi

    AU - Zushi, H.

    AU - Nagasaki, K.

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