Study of the harmonic oscillation on EAST by an eight-channel Doppler Backscattering (DBS) system.

POSTER

Abstract

The eight-channel DBS system has been installed for turbulence measurements in such plasmas. The frequency range is 55 to 75 GHz, covering the entire H-mode pedestal, with a turbulence wavenumber range of 4-12/cm.. A harmonic oscillation has been observed by DBS on EAST during ELMy-free H mode. The fundamental frequency of the coherent oscillation is 12-20 kHz and 2nd-8th harmonic are observed, and the radial coverage is from the edge to rho\textasciitilde 0.85.

Authors

  • C. Zhou

    University of Science and Technology of China

  • A.D. Liu

    University of Science and Technology of China

  • M. Y. Wang

    Univ of Sci & Tech of China, University of Science and Technology of China

  • J. Q. Hu

    University of Science and Technology of China

  • J. Zhang

    University of Science and Technology of China

  • Hong Li

    University of Science and Technology of China

  • Tao Lan

    University of Science and Technology of China, Department of Modern Physics, University of Science and Technology of China

  • J. L. Xie

    University of Science and Technology of China

  • Wandong Liu

    University of Science and Technology of China

  • C. X. Yu

    University of Science and Technology of China

  • E. J. Doyle

    University of California, Los Angeles