Development of Two-Color Laser Imaging Interferometer Using CO<sub>2 </sub>Laser and Quantum Cascade Laser in the Large Helical Device

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  • KINOSHITA Toshiki
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • TANAKA Kenji
    National Institute for Fusion Science, National Institutes of Natural Sciences
  • TAKEMURA Yuki
    National Institute for Fusion Science, National Institutes of Natural Sciences The Graduate University for Advanced Studies, SOKENDAI
  • TAKESHIDA Shota
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
  • SAKAI Hikona
    Interdisciplinary Graduate School of Engineering Sciences, Kyushu University

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  • Development of Two-Color Laser Imaging Interferometer Using CO2 Laser and Quantum Cascade Laser in the Large Helical Device

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<p>CO2 laser interferometers are a promising option for high-density plasma measurements. However, in low- and middle-density measurements, noise due to mechanical vibrations is a serious problem. To remove this noise, we developed a two-color laser imaging interferometer using a CO2 laser and quantum cascade (QC) laser, called the CO2/QC laser imaging interferometer, through benchtop experiments and installed it in the Large Helical Device (LHD). Benchtop experiments provided optical design guidelines for the CO2/QC laser imaging interferometer to minimize the influence of the unstable output wavelength of the QC laser. The optical system in LHD was designed according to this guideline, and the vibration noise was successfully reduced to 2.80 × 1018 m-3. We also demonstrate measurement examples of hollowed and peaked electron density profiles evaluated using Abel inversion and macro-scale instability. This is the first study to present the measurement results of high-temperature plasma using a CO2/QC two-color laser interferometer. The study outcomes provide important insights for the development of two-color laser interferometers in future fusion devices.</p>

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 17 (0), 1402107-1402107, 2022-12-09

    The Japan Society of Plasma Science and Nuclear Fusion Research

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