[Table of Contents]

Plasma and Fusion Research

Volume 5, S2092 (2010)

Regular Articles

Development of a Thomson Scattering System in the TST-2 Spherical Tokamak
Takashi YAMAGUCHI, Akira EJIRI, Junichi HIRATSUKA1), Yuichi TAKASE, Yoshihiko NAGASHIMA, Osamu WATANABE, Takuya SAKAMOTO, Takuya OHSAKO, Byung Il AN1), Hiroki KURASHINA, Hiroaki KOBAYASHI, Hiroyuki HAYASHI, Hazuki MATSUZAWA, Kotaro YAMADA, Hidetoshi KAKUDA1), Kentaro HANASHIMA and Takuma WAKATSUKI1)
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
1)
Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
(Received 9 December 2009 / Accepted 17 March 2010 / Published 10 December 2010)

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.

Keywords

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

DOI: 10.1585/pfr.5.S2092

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This paper may be cited as follows:

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 and Takuma WAKATSUKI, Plasma Fusion Res. 5, S2092 (2010).