Electron Bernstein wave heating by electron cyclotron wave injection from the high-field side in LHD

Y. Yoshimura, H. Igami, S. Kubo, T. Shimozuma, H. Takahashi, M. Nishiura, S. Ohdachi, K. Tanaka, K. Ida, M. Yoshinuma, C. Suzuki, S. Ogasawara, R. Makino, Hiroshi Idei, R. Kumazawa, T. Mutoh, H. Yamada

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    In the Large Helical Device (LHD), evident electron Bernstein wave (EBW) heating was successfully performed. The experiment was carried out using the electron cyclotron heating (ECH) system that was upgraded by installation of high-power, long-pulse 77 GHz gyrotrons. The EBW heating was achieved by a mode conversion from injected EC wave to EBW, by the so-called slow-XB technique where an X-mode wave is injected to the plasma from the high magnetic field side. The specific magnetic configuration of LHD provides a good opportunity to realize the slow-XB technique, which is generally difficult for tokamaks. With the slow-XB technique, increases in kinetically evaluated electron energy W pe and electron temperature Te were observed in overdense plasmas. An electron heating in the so-called super dense core plasma in LHD, which is characterized with an internal diffusion barrier and a steep density gradient at the plasma core, was successfully demonstrated in the plasma core region where the central electron density ne0 of 17 × 10 19 m-3 was about 1.2 times higher, at the beginning of the EC-wave injection, than the left-hand cut-off density of applied 77 GHz EC waves.

    Original languageEnglish
    Article number063004
    JournalNuclear Fusion
    Volume53
    Issue number6
    DOIs
    Publication statusPublished - Jun 1 2013

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    cyclotrons
    injection
    heating
    electrons
    electron energy
    electron cyclotron heating
    cyclotron resonance devices
    installing
    cut-off
    gradients
    configurations
    pulses
    magnetic fields

    All Science Journal Classification (ASJC) codes

    • Nuclear and High Energy Physics
    • Condensed Matter Physics

    Cite this

    Yoshimura, Y., Igami, H., Kubo, S., Shimozuma, T., Takahashi, H., Nishiura, M., ... Yamada, H. (2013). Electron Bernstein wave heating by electron cyclotron wave injection from the high-field side in LHD. Nuclear Fusion, 53(6), [063004]. https://doi.org/10.1088/0029-5515/53/6/063004

    Electron Bernstein wave heating by electron cyclotron wave injection from the high-field side in LHD. / Yoshimura, Y.; Igami, H.; Kubo, S.; Shimozuma, T.; Takahashi, H.; Nishiura, M.; Ohdachi, S.; Tanaka, K.; Ida, K.; Yoshinuma, M.; Suzuki, C.; Ogasawara, S.; Makino, R.; Idei, Hiroshi; Kumazawa, R.; Mutoh, T.; Yamada, H.

    In: Nuclear Fusion, Vol. 53, No. 6, 063004, 01.06.2013.

    Research output: Contribution to journalArticle

    Yoshimura, Y, Igami, H, Kubo, S, Shimozuma, T, Takahashi, H, Nishiura, M, Ohdachi, S, Tanaka, K, Ida, K, Yoshinuma, M, Suzuki, C, Ogasawara, S, Makino, R, Idei, H, Kumazawa, R, Mutoh, T & Yamada, H 2013, 'Electron Bernstein wave heating by electron cyclotron wave injection from the high-field side in LHD', Nuclear Fusion, vol. 53, no. 6, 063004. https://doi.org/10.1088/0029-5515/53/6/063004
    Yoshimura, Y. ; Igami, H. ; Kubo, S. ; Shimozuma, T. ; Takahashi, H. ; Nishiura, M. ; Ohdachi, S. ; Tanaka, K. ; Ida, K. ; Yoshinuma, M. ; Suzuki, C. ; Ogasawara, S. ; Makino, R. ; Idei, Hiroshi ; Kumazawa, R. ; Mutoh, T. ; Yamada, H. / Electron Bernstein wave heating by electron cyclotron wave injection from the high-field side in LHD. In: Nuclear Fusion. 2013 ; Vol. 53, No. 6.
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