Optimization of incident wave polarization for ECRH in LHD

T. Notake, S. Kubo, T. Shimozuma, H. Idei, Y. Yoshimura, S. Inagaki, K. Ohkubo, S. Kobayashi, Y. Mizuno, S. Ito, Y. Takita, T. Watari, K. Narihara, T. Morisaki, I. Yamada, Y. Nagayama, K. Tanaka, S. Sakakibara, R. Kumazawa, T. SekiK. Saito, T. Mutoh, A. Shimizu, A. Komori

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    This paper reports on the results of an experimental investigation into electron cyclotron resonance heating (ECRH) using the fundamental O-mode in the large helical device (LHD). The aim of the experiment is to understand the mechanism of the selective excitation of the O-mode EC wave and, thereby, optimize the performance of the ECRH. The polarization angle and the ellipticity of the electric field of the incident high power millimetre waves were varied in the experiment using a pair of grating polarizers. The responses of the plasma stored energy and electron temperature were measured to evaluate the effects. The optimum values of the polarization angle and the ellipticity for the ECRH were identified experimentally. A simple model of power branching between the O- and X-modes is introduced in order to interpret the observed experimental results. Specific to the ECRH in the LHD configuration, the effect of magnetic shear in the plasma peripheral region is considered.

    Original languageEnglish
    Pages (from-to)531-544
    Number of pages14
    JournalPlasma Physics and Controlled Fusion
    Volume47
    Issue number3
    DOIs
    Publication statusPublished - Mar 1 2005

    Fingerprint

    polarization (waves)
    Electron cyclotron resonance
    electron cyclotron resonance
    Polarization
    Heating
    optimization
    heating
    ellipticity
    Plasmas
    Electron temperature
    polarization
    polarizers
    Millimeter waves
    millimeter waves
    Experiments
    Electric fields
    gratings
    electron energy
    shear
    electric fields

    All Science Journal Classification (ASJC) codes

    • Nuclear Energy and Engineering
    • Condensed Matter Physics

    Cite this

    Optimization of incident wave polarization for ECRH in LHD. / Notake, T.; Kubo, S.; Shimozuma, T.; Idei, H.; Yoshimura, Y.; Inagaki, S.; Ohkubo, K.; Kobayashi, S.; Mizuno, Y.; Ito, S.; Takita, Y.; Watari, T.; Narihara, K.; Morisaki, T.; Yamada, I.; Nagayama, Y.; Tanaka, K.; Sakakibara, S.; Kumazawa, R.; Seki, T.; Saito, K.; Mutoh, T.; Shimizu, A.; Komori, A.

    In: Plasma Physics and Controlled Fusion, Vol. 47, No. 3, 01.03.2005, p. 531-544.

    Research output: Contribution to journalArticle

    Notake, T, Kubo, S, Shimozuma, T, Idei, H, Yoshimura, Y, Inagaki, S, Ohkubo, K, Kobayashi, S, Mizuno, Y, Ito, S, Takita, Y, Watari, T, Narihara, K, Morisaki, T, Yamada, I, Nagayama, Y, Tanaka, K, Sakakibara, S, Kumazawa, R, Seki, T, Saito, K, Mutoh, T, Shimizu, A & Komori, A 2005, 'Optimization of incident wave polarization for ECRH in LHD', Plasma Physics and Controlled Fusion, vol. 47, no. 3, pp. 531-544. https://doi.org/10.1088/0741-3335/47/3/009
    Notake, T. ; Kubo, S. ; Shimozuma, T. ; Idei, H. ; Yoshimura, Y. ; Inagaki, S. ; Ohkubo, K. ; Kobayashi, S. ; Mizuno, Y. ; Ito, S. ; Takita, Y. ; Watari, T. ; Narihara, K. ; Morisaki, T. ; Yamada, I. ; Nagayama, Y. ; Tanaka, K. ; Sakakibara, S. ; Kumazawa, R. ; Seki, T. ; Saito, K. ; Mutoh, T. ; Shimizu, A. ; Komori, A. / Optimization of incident wave polarization for ECRH in LHD. In: Plasma Physics and Controlled Fusion. 2005 ; Vol. 47, No. 3. pp. 531-544.
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    abstract = "This paper reports on the results of an experimental investigation into electron cyclotron resonance heating (ECRH) using the fundamental O-mode in the large helical device (LHD). The aim of the experiment is to understand the mechanism of the selective excitation of the O-mode EC wave and, thereby, optimize the performance of the ECRH. The polarization angle and the ellipticity of the electric field of the incident high power millimetre waves were varied in the experiment using a pair of grating polarizers. The responses of the plasma stored energy and electron temperature were measured to evaluate the effects. The optimum values of the polarization angle and the ellipticity for the ECRH were identified experimentally. A simple model of power branching between the O- and X-modes is introduced in order to interpret the observed experimental results. Specific to the ECRH in the LHD configuration, the effect of magnetic shear in the plasma peripheral region is considered.",
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    AU - Notake, T.

    AU - Kubo, S.

    AU - Shimozuma, T.

    AU - Idei, H.

    AU - Yoshimura, Y.

    AU - Inagaki, S.

    AU - Ohkubo, K.

    AU - Kobayashi, S.

    AU - Mizuno, Y.

    AU - Ito, S.

    AU - Takita, Y.

    AU - Watari, T.

    AU - Narihara, K.

    AU - Morisaki, T.

    AU - Yamada, I.

    AU - Nagayama, Y.

    AU - Tanaka, K.

    AU - Sakakibara, S.

    AU - Kumazawa, R.

    AU - Seki, T.

    AU - Saito, K.

    AU - Mutoh, T.

    AU - Shimizu, A.

    AU - Komori, A.

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    N2 - This paper reports on the results of an experimental investigation into electron cyclotron resonance heating (ECRH) using the fundamental O-mode in the large helical device (LHD). The aim of the experiment is to understand the mechanism of the selective excitation of the O-mode EC wave and, thereby, optimize the performance of the ECRH. The polarization angle and the ellipticity of the electric field of the incident high power millimetre waves were varied in the experiment using a pair of grating polarizers. The responses of the plasma stored energy and electron temperature were measured to evaluate the effects. The optimum values of the polarization angle and the ellipticity for the ECRH were identified experimentally. A simple model of power branching between the O- and X-modes is introduced in order to interpret the observed experimental results. Specific to the ECRH in the LHD configuration, the effect of magnetic shear in the plasma peripheral region is considered.

    AB - This paper reports on the results of an experimental investigation into electron cyclotron resonance heating (ECRH) using the fundamental O-mode in the large helical device (LHD). The aim of the experiment is to understand the mechanism of the selective excitation of the O-mode EC wave and, thereby, optimize the performance of the ECRH. The polarization angle and the ellipticity of the electric field of the incident high power millimetre waves were varied in the experiment using a pair of grating polarizers. The responses of the plasma stored energy and electron temperature were measured to evaluate the effects. The optimum values of the polarization angle and the ellipticity for the ECRH were identified experimentally. A simple model of power branching between the O- and X-modes is introduced in order to interpret the observed experimental results. Specific to the ECRH in the LHD configuration, the effect of magnetic shear in the plasma peripheral region is considered.

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