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Large-scale structures and turbulence saturation in gyrofluid ETG simulations

  • JIQUAN LI (a1) (a2) (a3), Y. KISHIMOTO (a4) (a5), N. MIYATO (a5), T. MATSUMOTO (a5) and J. Q. DONG (a1) (a2)...

The dynamics of secondary fluctuations with poloidal long wavelength and low frequency in electron-temperature-gradient (ETG) turbulence saturation is considered in sheared slab geometry. A simplified modeling analysis shows that this kind of large-scale structure including streamers may saturate primary ETG instability through poloidal mode coupling. Spectral analyses in three-dimensional ETG simulations clearly exhibit the secondary excitation and the probable relevancy to ETG saturation. The result may implicate a lower fluctuation level in ETG turbulence.

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Journal of Plasma Physics
  • ISSN: 0022-3778
  • EISSN: 1469-7807
  • URL: /core/journals/journal-of-plasma-physics
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