Application of Digital Phase Analysis to Far-Infrared Laser Interferometer for the Large Helical Device

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  • SAKAI Hikona
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • TANAKA Kenji
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University National Institute for Fusion Science
  • TAKEMURA Yuki
    National Institute for Fusion Science The Graduate University for Advanced Studies, SOKENDAI
  • ITO Yasuhiko
    National Institute for Fusion Science
  • TOKUZAWA Tokihiko
    National Institute for Fusion Science The Graduate University for Advanced Studies, SOKENDAI
  • YASUHARA Ryo
    National Institute for Fusion Science The Graduate University for Advanced Studies, SOKENDAI
  • UEHARA Hiyori
    National Institute for Fusion Science The Graduate University for Advanced Studies, SOKENDAI
  • KINOSHITA Toshiki
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • AKIYAMA Tsuyoshi
    National Institute for Fusion Science
  • NAKAYAMA Kazuya
    College of Engineering, Chubu University
  • KAWAHATA Kazuo
    National Institute for Fusion Science

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Description

<p>A digital phase analysis technique was applied to a 119-m wavelength far-infrared (FIR) laser interferometer on the Large Helical Device (LHD). High-density plasma measurement without phase jumping was achieved, representing an improvement over measurements made using a conventional analog phase counter. Digital phase analysis became operational at a quarter of the threshold of the analog phase counter. The phase sensitivity was also improved using digital analysis because the noise level was reduced to approximately half that of the conventional analog phase counter. The improved phase sensitivity enabled measurement of small-amplitude fluctuations.</p>

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 18 (0), 1402062-1402062, 2023-08-02

    The Japan Society of Plasma Science and Nuclear Fusion Research

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