GAM generation by drift waves in JIPP T-llU tokamak core plasmas

Y. Hamada, T. Watari, A. Nishizawa, O. Yamagishi, K. Narihara, Y. Kawasumi, T. Ido, M. Kojima, K. Toi

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2 Citations (Scopus)

Abstract

Density and potential fluctuations were measured in the core region of the JIPP-TIIU plasma using a heavy ion beam probe. By applying a new technique of wavenumber resolved bicoherence, the coupling of the drift waves with zonal flows was clearly observed. In addition, nonlinear energy flow from drift-wave turbulence to high-frequency zonal flows using Ritz's model equation was first observed in the core region of low-density tokamak plasmas, which means there is generation of GAM by drift waves. The nonlinear growth rate of high-frequency zonal flow was estimated to be in the order of 104 s-1 or higher. In additionally heated plasmas where low-frequency ion temperature gradient mode is dominant, the bicoherence pattern changes drastically.

Original languageEnglish
Article number025001
JournalNuclear Fusion
Volume50
Issue number2
DOIs
Publication statusPublished - Jan 29 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Condensed Matter Physics

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    Hamada, Y., Watari, T., Nishizawa, A., Yamagishi, O., Narihara, K., Kawasumi, Y., Ido, T., Kojima, M., & Toi, K. (2010). GAM generation by drift waves in JIPP T-llU tokamak core plasmas. Nuclear Fusion, 50(2), [025001]. https://doi.org/10.1088/0029-5515/50/2/025001