Fluctuation Measurement Across the Broad Range of the Low-field Side Edge Plasmas in the TST-2 Spherical Tokamak

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Abstract

This paper presents initial results from experimental observation of edge turbulence structures in ohmically heated plasmas on Tokyo Spherical Tokamak-2 (TST-2). The experiment was conducted using two-dimensionally movable Langmuir probes. With monitoring floating potential <i>V</i><sub>f</sub> and ion saturation current <i>I</i><sub>is</sub>, the radial and poloidal structures of the edge turbulence are obtained. The high coherence in fluctuations at 10-100kHz frequency was observed by the use of the Langmuir probes 90° toroidally and ∼75° poloidally distant from each other, suggesting that the fluctuations have long range correlation along a magnetic field line. To investigate nonlinear structures of the turbulence, bispectral analysis was used, and the observed auto-bicoherence pattern suggests the presence of the coupling and energy transfer between different modes.

Journal

  • IEEJ Transactions on Fundamentals and Materials

    IEEJ Transactions on Fundamentals and Materials 132(7), 499-504, 2012-07-01

    The Institute of Electrical Engineers of Japan

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Codes

  • NII Article ID (NAID)
    10030777806
  • NII NACSIS-CAT ID (NCID)
    AN10136312
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    03854205
  • NDL Article ID
    023886094
  • NDL Call No.
    Z16-793
  • Data Source
    CJP  NDL  J-STAGE 
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