Reflectometry for Density Fluctuation and Profile Measurements in TST-2

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  • YAMADA Takuma
    Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
  • EJIRI Akira
    Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
  • SHIMADA Yoshiyuki
    Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
  • OOSAKO Takuya
    Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
  • TSUJIMURA Jiro
    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
  • TORII Yuuki
    High Temperature Plasma Center, The University of Tokyo, Kashiwa 277-8568, Japan
  • SASAKI Makoto
    Graduate School of Science, The University of Tokyo, Bunkyo 113-0033, Japan
  • TOJO Hiroshi
    Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
  • MASUDA Tetsuya
    Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
  • NUGA Hideo
    Graduate School of Science, The University of Tokyo, Bunkyo 113-0033, Japan
  • SUMITOMO Nobuyuki
    Graduate School of Science, The University of Tokyo, Bunkyo 113-0033, Japan
  • KAINAGA Soichiro
    Graduate School of Science, The University of Tokyo, Bunkyo 113-0033, Japan
  • SUGIYAMA Junichi
    Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan

Description

A reflectometer in Ka-band was designed, constructed and applied to the TST-2 spherical tokamak in order to detect density fluctuations induced by the radio frequency (RF) heating wave, and to measure the density profile. The optics of the reflectometer consists of two concave mirrors to make a small microwave beam spot inside the plasma. Using Kirchhoff integration, the parameters of the optics were optimized to achieve a high throughput (i.e. the ratio of the received to the launched powers) in various measurement conditions. Using the reflectometer, the density fluctuations in the frequency range of RF were detected and the electric field excited by RF (21 MHz/260 kW) was estimated to be about 1.3 kV/m.

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 2 S1037-S1037, 2007

    The Japan Society of Plasma Science and Nuclear Fusion Research

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