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.

*Work supported by the Natural Science Foundation of China (NSFC) under 11475173, 11505184, National Magnetic Confinement Fusion Energy Development Program of China under 2013GB106002 and 2014GB109002, and DOE Grants DE- SC0010424 and DE-SC0010469.

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