Development of Collective Thomson Scattering Diagnostic for Bulk and Fast Ions in the Large Helical Device

DOI IR IR (HANDLE) Web Site 4 Citations 12 References Open Access
  • NISHIURA Masaki
    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
  • KUBO Shin
    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
  • TANAKA Kenji
    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
  • TAMURA Namiko
    Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
  • SHIMOZUMA Takashi
    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
  • MUTOH Takashi
    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
  • KAWAHATA Kazuo
    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
  • WATARI Tetsuo
    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
  • SAITO Teruo
    FIR FU, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
  • TATEMATSU Yoshinori
    FIR FU, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
  • LHD Experiment Group
    National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan

Search this article

Description

The collective Thomson scattering (CTS) technique has been utilized with the backscattering configuration to diagnose the bulk and fast ions in the Large Helical Device (LHD). The spectrogram of the scattered radiation presents the transient phenomena related to fast ion slowing down in auxiliary neutral beam heated plasmas. This is obtained by the broad band receiver resolving with 32 channels, while the probing beam from 77 GHz gyrotron is modulated with 50 Hz and is injected into plasmas. In the same shot, especially in low temperature plasma (Te, Ti < 1 keV), a wave excitation is also observed in a narrow frequency band. The peaks in the CTS spectrum exist between 0.5 and 1.0 GHz and are observed in both frequency sides asymmetry. For the forthcoming experiments, the feasibility of CTS diagnostics at a new port location is assessed to extend the diagnostic capability for measuring the ion velocity components. Expected spectra for scattered radiation are the same signal level as the present location from a numerical calculation.

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research 6 2402068-2402068, 2011

    The Japan Society of Plasma Science and Nuclear Fusion Research

Citations (4)*help

See more

References(12)*help

See more

Related Projects

See more

Keywords

Details 詳細情報について

Report a problem

Back to top