Development of Line Integrated Thomson Scattering System for TST-2 Spherical Tokamak Device

Yuta TAKECHI; Akira EJIRI; Kouji SHINOHARA; Naoto TSUJII; Yi PENG; Yu-Ting LIN; Zhengnan JIANG; Yiming TIAN; Fumiya ADACHI; Shengyu WANG; Takeshi IDO; Kaori KONO; Yoshihiko NAGASHIMA

doi:10.1585/pfr.20.1401046

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Development of Line Integrated Thomson Scattering System for TST-2 Spherical Tokamak Device

Yuta TAKECHI, Akira EJIRI, Kouji SHINOHARA, Naoto TSUJII, Yi PENG, Yu-Ting LIN, Zhengnan JIANG, Yiming TIAN, Fumiya ADACHI, Shengyu WANG, Takeshi IDO, Kaori KONO, Yoshihiko NAGASHIMA

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Keywords: Thomson scattering measurement, line integrated measurement, stray light, laser injection optics, TST-2

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2025 Volume 20 Article ID: 1401046

DOI https://doi.org/10.1585/pfr.20.1401046

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Abstract

A line integrated Thomson scattering (LITS) measurement system with a single line of sight was designed, assembled and installed on the TST-2 spherical tokamak device. Ohmic discharge plasmas were measured using it to clarify the performance of the LITS system. The effective scattering intensity profiles along the laser beam, which are key information affecting the performance and analysis, were measured using a movable target. Thomson scattering signals were obtained, and electron temperatures were compared with those obtained by a conventional TS system. The temperatures agree within the error bars, considering the spatial ambiguities of the LITS due to the long scattering length.

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