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<p>This study reports the development of <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\hbox {CO}_2\)</EquationSource> </InlineEquation> laser interferometers for electron density measurements on the large helical device (LHD). Two types of interferometers using approximately 10 <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(\mu m\)</EquationSource> </InlineEquation> are developed. One is an imaging two-color laser interferometer (I-TCI) for measuring density profiles and macroscopic fluctuations of MHD instabilities, and the other is a single channel phase-modulated dispersion interferometer (PMDI) designed for reliable density monitoring. The diagnostic principles, systems, and analysis techniques are outlined, and representative measurement results are presented. The I-TCI system was also designed to operate in the deuterium experiments performed on LHD from 2017 until 2022. Shielding against neutron and <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(\gamma\)</EquationSource> </InlineEquation>-ray irradiation was necessary to prevent damage to the I-TCI detection system. Design strategies for neutron and <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\gamma\)</EquationSource> </InlineEquation>-ray shielding are presented in the appendices.</p>

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CO2-laser Interferometer on the Large Helical Device

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月5日

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  • Kenji Tanaka,
  • Tsuyoshi Akiyama,
  • Toshiki Kinoshita,
  • Hikona Sakai,
  • Yuki Takemura,
  • Hikaru Okuwada,
  • Akira Uritani,
  • Clive Michael

摘要

This study reports the development of \(\hbox {CO}_2\) laser interferometers for electron density measurements on the large helical device (LHD). Two types of interferometers using approximately 10 \(\mu m\) are developed. One is an imaging two-color laser interferometer (I-TCI) for measuring density profiles and macroscopic fluctuations of MHD instabilities, and the other is a single channel phase-modulated dispersion interferometer (PMDI) designed for reliable density monitoring. The diagnostic principles, systems, and analysis techniques are outlined, and representative measurement results are presented. The I-TCI system was also designed to operate in the deuterium experiments performed on LHD from 2017 until 2022. Shielding against neutron and \(\gamma\) -ray irradiation was necessary to prevent damage to the I-TCI detection system. Design strategies for neutron and \(\gamma\) -ray shielding are presented in the appendices.