Density Fluctuations in the JFT-2M H-Mode Plasma Measured by Using a New Analysis Method of Microwave Reflectometry

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Abstract

Density fluctuations in JFT-2M tokamak are investigated by a microwave reflectometer using the new complex amplitude analysis(K. Shinohara et al., Jpn. J. Appl. Phys. 36, 7367(1997)). A coherent spectral peak in the fluctuation spectrum is found during the H'-mode which is defined as the H-mode with degraded confinement. It seems that the amplitude of the coherent fluctuation would not directly determine the confinement from the comparison between a plasma with co-injection of the neutral beam and a plasma with counter-injection. It is also found that high frequency fluctuations(>500kHz)during the H-mode are larger than those during the L-mode. We discuss such complex roles of the fluctuation spectrum to the confinement based on the data obtained by this measurement.

Journal

  • Journal of plasma and fusion research

    Journal of plasma and fusion research 74(6), 607-615, 1998-06-25

    プラズマ・核融合学会

References:  21

Cited by:  3

Codes

  • NII Article ID (NAID)
    110003826233
  • NII NACSIS-CAT ID (NCID)
    AN10401672
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    09187928
  • NDL Article ID
    4510870
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z15-8
  • Data Source
    CJP  CJPref  NDL  NII-ELS  NDL-Digital 
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