Development of a Thomson Scattering System in the TST-2 Spherical Tokamak

Takashi YAMAGUCHI; Akira EJIRI; Junichi HIRATSUKA; Yuichi TAKASE; Yoshihiko NAGASHIMA; Osamu WATANABE; Takuya SAKAMOTO; Takuya OHSAKO; Byung Il AN; Hiroki KURASHINA; Hiroaki KOBAYASHI; Hiroyuki HAYASHI; Hazuki MATSUZAWA; Kotaro YAMADA; Hidetoshi KAKUDA; Kentaro HANASHIMA; Takuma WAKATSUKI

doi:10.1585/pfr.5.S2092

Regular Articles

Development of a Thomson Scattering System in the TST-2 Spherical Tokamak

Takashi YAMAGUCHI, Akira EJIRI, Junichi HIRATSUKA, Yuichi TAKASE, Yoshihiko NAGASHIMA, Osamu WATANABE, Takuya SAKAMOTO, Takuya OHSAKO, Byung Il AN, Hiroki KURASHINA, Hiroaki KOBAYASHI, Hiroyuki HAYASHI, Hazuki MATSUZAWA, Kotaro YAMADA, Hidetoshi KAKUDA, Kentaro HANASHIMA, Takuma WAKATSUKI

Author information

Takashi YAMAGUCHI
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Akira EJIRI
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Junichi HIRATSUKA
Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
Yuichi TAKASE
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Yoshihiko NAGASHIMA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Osamu WATANABE
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Takuya SAKAMOTO
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Takuya OHSAKO
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Byung Il AN
Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
Hiroki KURASHINA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Hiroaki KOBAYASHI
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Hiroyuki HAYASHI
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Hazuki MATSUZAWA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Kotaro YAMADA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Hidetoshi KAKUDA
Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
Kentaro HANASHIMA
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
Takuma WAKATSUKI
Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan

Keywords: spherical tokamak, TST-2, Thomson scattering, Newtonian mirror system, fiber, polychromator, Rayleigh scattering, multi point measurement

JOURNAL FREE ACCESS

2010 Volume 5 Pages S2092

DOI https://doi.org/10.1585/pfr.5.S2092

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Abstract

The Thomson scattering system in the TST-2 has been upgraded to improve the reliability and accuracy of measurements. The signal intensity increased because of a new high-energy (1.6 J) laser. A large-numerical-aperture (N.A.) fiber was tested, and it was found that a 6-m-long fiber can be used without significant transmission loss. With the upgraded system, the typical central electron temperature and the electron density for ohmic discharges (with a plasma current of 60 kA) are 150 eV and 1.5 × 10¹⁹ m⁻³, respectively. The temperature profile has a maximum near the center of the plasma.

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