Electron Temperature Measurement on QUEST Spherical Tokamak by Thomson Scattering System

Takashi YAMAGUCHI; Akira EJIRI; Junichi HIRATSUKA; Makoto HASEGAWA; Yoshihiko NAGASHIMA; Kazumichi NARIHARA; Yuichi TAKASE; Hideki ZUSHI; the QUEST group

doi:10.1585/pfr.8.1302001

Letters

Electron Temperature Measurement on QUEST Spherical Tokamak by Thomson Scattering System

Takashi YAMAGUCHI, Akira EJIRI, Junichi HIRATSUKA, Makoto HASEGAWA, Yoshihiko NAGASHIMA, Kazumichi NARIHARA, Yuichi TAKASE, Hideki ZUSHI, the QUEST group

Author information

Takashi YAMAGUCHI
Graduate School of Frontier Sciences, The University of Tokyo
Akira EJIRI
Graduate School of Frontier Sciences, The University of Tokyo
Junichi HIRATSUKA
Graduate School of Science, The University of Tokyo
Makoto HASEGAWA
Research Institute for Applied Mechanics, Kyushu University
Yoshihiko NAGASHIMA
Research Institute for Applied Mechanics, Kyushu University
Kazumichi NARIHARA
National Institute for Fusion Science
Yuichi TAKASE
Graduate School of Frontier Sciences, The University of Tokyo
Hideki ZUSHI
Research Institute for Applied Mechanics, Kyushu University
the QUEST group
Research Institute for Applied Mechanics, Kyushu University

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

JOURNAL FREE ACCESS

2013 Volume 8 Pages 1302001

DOI https://doi.org/10.1585/pfr.8.1302001

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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 steadystate 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.

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