Plasma and Fusion Research

Volume 20, 1401046 (2025)

Regular Articles

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

Yuta TAKECHI¹⁾, Akira EJIRI¹⁾, Kouji SHINOHARA¹⁾, Naoto TSUJII¹⁾, Yi PENG¹⁾, Yu-Ting LIN¹⁾, Zhengnan JIANG¹⁾, Yiming TIAN¹⁾, Fumiya ADACHI¹⁾, Shengyu WANG¹⁾, Takeshi IDO²⁾, Kaori KONO²⁾, Yoshihiko NAGASHIMA²⁾

1): The University of Tokyo, Kashiwa 277-8561, Japan
2): Kyushu University, Kasuga 816-8580, Japan

(Received 26 May 2025 / Accepted 13 July 2025 / Published 15 October 2025)

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.

Keywords

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

DOI: 10.1585/pfr.20.1401046

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