Activities on realization of high-power and steady-state ECRH system and achievement of high performance plasmas in LHD

T. Shimozuma, S. Kubo, Y. Yoshimura, H. Igami, H. Takahashi, R. Ikeda, N. Tamura, S. Kobayashi, S. Ito, Y. Mizuno, Y. Takita, T. Mutoh, R. Minami, T. Kariya, T. Imai, Hiroshi Idei, M. A. Shapiro, R. J. Temkin, F. Felici, T. GoodmanO. Sauter

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Electron Cyclotron Resonance Heating (ECRH) has contributed to the achievement of high performance plasma production, high electron temperature plasmas and sustainment of steady-state plasmas in the Large Helical Device (LHD). Our immediate targets of upgrading the ECRH system are 5 MW several seconds and 1 MW longer than one hour power injection into LHD. The improvement will greatly extend the plasma parameter regime. For that purpose, we have been promoting the development and installation of 77 GHz/1-1.5 MW/several seconds and 0.3 MW/CW gyrotrons in collaboration with University of Tsukuba. The transmission lines are re-examined and improved for high and CW power transmission. In the recent experimental campaign, two 77 GHz gyrotrons were operated. One more gyrotron, which was designed for 1.5 MW/2 s output, was constructed and is tested. We have been promoting to improve total ECRH efficiency for efficient gyrotron-power use and efficient plasma heating, e.g. a new waveguide alignment method and mode-content analysis and the feedback control of the injection polarization. In the last experimental campaign, the 77 GHz gyrotrons were used in combination with the existing 84 GHz range and 168 GHz gyrotrons. Multi-frequency ECRH system is more flexible in plasma heating experiments and diagnostics. A lot of experiments have been performed in relation to high electron temperature plasmas by realization of the core electron-root confinement (CERC), electron cyclotron current drive (ECCD), Electron Bernstein Wave heating, and steady-state plasma sustainment. Some of the experimental results are briefly described.

    Original languageEnglish
    Title of host publicationRadio Frequency Power in plasmas - Proceedings of the 18th Topical Conference
    Pages479-486
    Number of pages8
    Volume1187
    DOIs
    Publication statusPublished - Dec 1 2009
    Event18th Topical Conference on Radio Frequency Power in plasmas - Gent, Belgium
    Duration: Jun 24 2009Jun 26 2009

    Other

    Other18th Topical Conference on Radio Frequency Power in plasmas
    CountryBelgium
    CityGent
    Period6/24/096/26/09

    Fingerprint

    electron cyclotron resonance
    cyclotron resonance devices
    heating
    plasma heating
    electron energy
    injection
    electrons
    upgrading
    power transmission
    feedback control
    transmission lines
    installing
    cyclotrons
    alignment
    waveguides
    output
    polarization

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy(all)

    Cite this

    Shimozuma, T., Kubo, S., Yoshimura, Y., Igami, H., Takahashi, H., Ikeda, R., ... Sauter, O. (2009). Activities on realization of high-power and steady-state ECRH system and achievement of high performance plasmas in LHD. In Radio Frequency Power in plasmas - Proceedings of the 18th Topical Conference (Vol. 1187, pp. 479-486) https://doi.org/10.1063/1.3273796

    Activities on realization of high-power and steady-state ECRH system and achievement of high performance plasmas in LHD. / Shimozuma, T.; Kubo, S.; Yoshimura, Y.; Igami, H.; Takahashi, H.; Ikeda, R.; Tamura, N.; Kobayashi, S.; Ito, S.; Mizuno, Y.; Takita, Y.; Mutoh, T.; Minami, R.; Kariya, T.; Imai, T.; Idei, Hiroshi; Shapiro, M. A.; Temkin, R. J.; Felici, F.; Goodman, T.; Sauter, O.

    Radio Frequency Power in plasmas - Proceedings of the 18th Topical Conference. Vol. 1187 2009. p. 479-486.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Shimozuma, T, Kubo, S, Yoshimura, Y, Igami, H, Takahashi, H, Ikeda, R, Tamura, N, Kobayashi, S, Ito, S, Mizuno, Y, Takita, Y, Mutoh, T, Minami, R, Kariya, T, Imai, T, Idei, H, Shapiro, MA, Temkin, RJ, Felici, F, Goodman, T & Sauter, O 2009, Activities on realization of high-power and steady-state ECRH system and achievement of high performance plasmas in LHD. in Radio Frequency Power in plasmas - Proceedings of the 18th Topical Conference. vol. 1187, pp. 479-486, 18th Topical Conference on Radio Frequency Power in plasmas, Gent, Belgium, 6/24/09. https://doi.org/10.1063/1.3273796
    Shimozuma T, Kubo S, Yoshimura Y, Igami H, Takahashi H, Ikeda R et al. Activities on realization of high-power and steady-state ECRH system and achievement of high performance plasmas in LHD. In Radio Frequency Power in plasmas - Proceedings of the 18th Topical Conference. Vol. 1187. 2009. p. 479-486 https://doi.org/10.1063/1.3273796
    Shimozuma, T. ; Kubo, S. ; Yoshimura, Y. ; Igami, H. ; Takahashi, H. ; Ikeda, R. ; Tamura, N. ; Kobayashi, S. ; Ito, S. ; Mizuno, Y. ; Takita, Y. ; Mutoh, T. ; Minami, R. ; Kariya, T. ; Imai, T. ; Idei, Hiroshi ; Shapiro, M. A. ; Temkin, R. J. ; Felici, F. ; Goodman, T. ; Sauter, O. / Activities on realization of high-power and steady-state ECRH system and achievement of high performance plasmas in LHD. Radio Frequency Power in plasmas - Proceedings of the 18th Topical Conference. Vol. 1187 2009. pp. 479-486
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    title = "Activities on realization of high-power and steady-state ECRH system and achievement of high performance plasmas in LHD",
    abstract = "Electron Cyclotron Resonance Heating (ECRH) has contributed to the achievement of high performance plasma production, high electron temperature plasmas and sustainment of steady-state plasmas in the Large Helical Device (LHD). Our immediate targets of upgrading the ECRH system are 5 MW several seconds and 1 MW longer than one hour power injection into LHD. The improvement will greatly extend the plasma parameter regime. For that purpose, we have been promoting the development and installation of 77 GHz/1-1.5 MW/several seconds and 0.3 MW/CW gyrotrons in collaboration with University of Tsukuba. The transmission lines are re-examined and improved for high and CW power transmission. In the recent experimental campaign, two 77 GHz gyrotrons were operated. One more gyrotron, which was designed for 1.5 MW/2 s output, was constructed and is tested. We have been promoting to improve total ECRH efficiency for efficient gyrotron-power use and efficient plasma heating, e.g. a new waveguide alignment method and mode-content analysis and the feedback control of the injection polarization. In the last experimental campaign, the 77 GHz gyrotrons were used in combination with the existing 84 GHz range and 168 GHz gyrotrons. Multi-frequency ECRH system is more flexible in plasma heating experiments and diagnostics. A lot of experiments have been performed in relation to high electron temperature plasmas by realization of the core electron-root confinement (CERC), electron cyclotron current drive (ECCD), Electron Bernstein Wave heating, and steady-state plasma sustainment. Some of the experimental results are briefly described.",
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    AU - Shimozuma, T.

    AU - Kubo, S.

    AU - Yoshimura, Y.

    AU - Igami, H.

    AU - Takahashi, H.

    AU - Ikeda, R.

    AU - Tamura, N.

    AU - Kobayashi, S.

    AU - Ito, S.

    AU - Mizuno, Y.

    AU - Takita, Y.

    AU - Mutoh, T.

    AU - Minami, R.

    AU - Kariya, T.

    AU - Imai, T.

    AU - Idei, Hiroshi

    AU - Shapiro, M. A.

    AU - Temkin, R. J.

    AU - Felici, F.

    AU - Goodman, T.

    AU - Sauter, O.

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    N2 - Electron Cyclotron Resonance Heating (ECRH) has contributed to the achievement of high performance plasma production, high electron temperature plasmas and sustainment of steady-state plasmas in the Large Helical Device (LHD). Our immediate targets of upgrading the ECRH system are 5 MW several seconds and 1 MW longer than one hour power injection into LHD. The improvement will greatly extend the plasma parameter regime. For that purpose, we have been promoting the development and installation of 77 GHz/1-1.5 MW/several seconds and 0.3 MW/CW gyrotrons in collaboration with University of Tsukuba. The transmission lines are re-examined and improved for high and CW power transmission. In the recent experimental campaign, two 77 GHz gyrotrons were operated. One more gyrotron, which was designed for 1.5 MW/2 s output, was constructed and is tested. We have been promoting to improve total ECRH efficiency for efficient gyrotron-power use and efficient plasma heating, e.g. a new waveguide alignment method and mode-content analysis and the feedback control of the injection polarization. In the last experimental campaign, the 77 GHz gyrotrons were used in combination with the existing 84 GHz range and 168 GHz gyrotrons. Multi-frequency ECRH system is more flexible in plasma heating experiments and diagnostics. A lot of experiments have been performed in relation to high electron temperature plasmas by realization of the core electron-root confinement (CERC), electron cyclotron current drive (ECCD), Electron Bernstein Wave heating, and steady-state plasma sustainment. Some of the experimental results are briefly described.

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