Experimental Study of Drift Wave Turbulence in Linear Plasmas

Access this Article

Author(s)

    • YAMADA Takuma
    • Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
    • KAWAI Yoshinobu
    • Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
    • ITOH Kimitaka
    • National Institute for Fusion Science, Toki 509-5292, Japan
    • ITOH Sanae -I.
    • Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
    • MARUTA Takashi
    • Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
    • SHINOHARA Shunjiro
    • Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
    • NAGASHIMA Yoshihiko
    • Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
    • YAGI Masatoshi
    • Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan
    • TERASAKA Kenichiro
    • Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga 816-8580, Japan
    • INAGAKI Shigeru
    • Research Institute for Applied Mechanics, Kyushu University, Kasuga 816-8580, Japan

Abstract

Linear plasmas allow multi-point, low-temperature measurements with Langmuir probes. We measured ion saturation-current fluctuations of a Large Mirror Device-Upgrade linear plasma using a poloidal Langmuir probe array. By varying the discharge conditions, the spatiotemporal behavior showed a change from a coherent sine wave to a turbulent waveform through a periodic, modulated sine wave. The two-dimensional (poloidal wave number and frequency) power spectrum for each regime showed a single fluctuation peak, a peak and its harmonics, and a number of peaks in the poloidal wave number-frequency space. Bi-spectral analysis was performed for the turbulent regime, and showed the existence of nonlinear couplings among fluctuation peaks and broadband components.

Journal

  • Plasma and Fusion Research

    Plasma and Fusion Research (3), 044-044, 2008

    The Japan Society of Plasma Science and Nuclear Fusion Research

Codes

  • NII Article ID (NAID)
    130000263926
  • Text Lang
    ENG
  • Data Source
    J-STAGE 
Page Top