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<p>Charge exchange spectroscopy is widely used in fusion plasma research as a method for measuring ion temperature distribution and plasma flow velocity. In the LHD, charge exchange spectroscopy has been applied to observe impurity density distribution, hydrogen/deuterium isotope ratio distribution, and distortion of the ion velocity distribution function using multiple systems that employ high-throughput spectrometers, multi-channel optical fibers, and high-speed image detectors. In the measurement of the hydrogen/deuterium ratio, we succeeded in the analysis by combining it with velocity distribution measurement using a conventional system. In the measurement of the ion velocity distribution function, we were able to grasp the overall situation by combining one with high spatial resolution and a system with high temporal resolution.</p>

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Development of Charge Exchange Spectroscopy in LHD

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月28日

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  • Mikirou Yoshinuma,
  • Katsumi Ida,
  • Tatsuya Kobayashi

摘要

Charge exchange spectroscopy is widely used in fusion plasma research as a method for measuring ion temperature distribution and plasma flow velocity. In the LHD, charge exchange spectroscopy has been applied to observe impurity density distribution, hydrogen/deuterium isotope ratio distribution, and distortion of the ion velocity distribution function using multiple systems that employ high-throughput spectrometers, multi-channel optical fibers, and high-speed image detectors. In the measurement of the hydrogen/deuterium ratio, we succeeded in the analysis by combining it with velocity distribution measurement using a conventional system. In the measurement of the ion velocity distribution function, we were able to grasp the overall situation by combining one with high spatial resolution and a system with high temporal resolution.