Estimation of the Effective Collective Thomson Scattering Volume Using a Gaussian Beam in the LHD ECRH System

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  • KUBO Shin
    National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
  • NISHIURA Masaki
    National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
  • TAMURA Namiko
    Department of Energy Science and Technology, Nagoya University, Nagoya 464-8463, Japan
  • TANAKA Kenji
    National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
  • SHIMOZUMA Takashi
    National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
  • TATEMATSU Yoshinori
    Research Center for Development of Far-Infrared Region, University of Fukui, Fukui 910-8507, Japan
  • SAITO Teruo
    Research Center for Development of Far-Infrared Region, University of Fukui, Fukui 910-8507, Japan
  • YOSHIMURA Yasuo
    National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
  • IGAMI Hiroe
    National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
  • TAKAHASHI Hiromi
    National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
  • IKEDA Ryosuke
    Research Center for Development of Far-Infrared Region, University of Fukui, Fukui 910-8507, Japan
  • MUTOH Takashi
    National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan

Description

Collective Thomson scattering (CTS) is a promising candidate for direct measurement of the velocity distribution function of ions in fusion devices. The relevant frequency for a CTS probing beam source is in the millimeter- to submillimeter-wave range. The scattering volume of CTS is an important parameter for determining the intensity of the scattered power and the spatial resolution of the measurement. The conventional method of estimating the scattering volume is to simply calculate the geometrical volume of the probing and receiving beams. This calculation is valid only when the beams are diffraction free. The effective scattering volume is defined and applied to a CTS system using strongly focused beams and its validity is examined experimentally.

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 5 S2103-S2103, 2010

    The Japan Society of Plasma Science and Nuclear Fusion Research

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