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

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Author(s)

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

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 × 10<sup>19</sup> m<sup>−3</sup>, respectively. The temperature profile has a maximum near the center of the plasma.

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research (5), S2092-S2092, 2010

    The Japan Society of Plasma Science and Nuclear Fusion Research

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