[Table of Contents]

Plasma and Fusion Research

Volume 8, 1302001 (2013)

Letters

Electron Temperature Measurement on QUEST Spherical Tokamak by Thomson Scattering System
Takashi YAMAGUCHI, Akira EJIRI, Junichi HIRATSUKA1), Makoto HASEGAWA2), Yoshihiko NAGASHIMA2), Kazumichi NARIHARA3), Yuichi TAKASE, Hideki ZUSHI2) and the QUEST group2)
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
1)
Graduate School of Science, The University of Tokyo, Kashiwa 277-8561, Japan
2)
Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
3)
National Institute for Fusion Science, Toki 509-5292, Japan
(Received 30 March 2012 / Accepted 6 September 2012 / Published 13 February 2013)

Abstract

On QUEST, we are carrying out the steady state operation by RF current drive. A Thomson scattering (TS) system has been constructed to measure the plasma electron temperature. This system consists of a Nd:YAG laser of energy 1.65 J, a spherical mirror for collection of the scattering light, and a polychromator for spectroscopy. Because the Thomson scattering signal is weak for the low-density RF-sustained plasma, many scattering pulse signals were accumulated from steady-state plasmas. Electron temperature profiles were obtained for the steady-state spherical tokamak (ST) plasma for the first time. Six spatial points were measured by moving the fiber position, and the plasma electron temperature was in the range 10-500 eV.

Keywords

Thomson scattering, spherical tokamak, steady state plasma, low-density plasma

DOI: 10.1585/pfr.8.1302001

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This paper may be cited as follows:

Takashi YAMAGUCHI, Akira EJIRI, Junichi HIRATSUKA, Makoto HASEGAWA, Yoshihiko NAGASHIMA, Kazumichi NARIHARA, Yuichi TAKASE, Hideki ZUSHI and the QUEST group, Plasma Fusion Res. 8, 1302001 (2013).