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Coherent structures in ion temperature gradient turbulence-zonal flow

  • Author(s): Singh, R
  • Singh, R
  • Kaw, P
  • Gürcan, D
  • Diamond, PH
  • et al.

Published Web Location

https://doi.org/10.1063/1.4898207
Abstract

© 2014 AIP Publishing LLC. Nonlinear stationary structure formation in the coupled ion temperature gradient (ITG)-zonal flow system is investigated. The ITG turbulence is described by a wave-kinetic equation for the action density of the ITG mode, and the longer scale zonal mode is described by a dynamic equation for the m = n = 0 component of the potential. Two populations of trapped and untrapped drift wave trajectories are shown to exist in a moving frame of reference. This novel effect leads to the formation of nonlinear stationary structures. It is shown that the ITG turbulence can self-consistently sustain coherent, radially propagating modulation envelope structures such as solitons, shocks, and nonlinear wave trains.

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