Role of nonlinear toroidal coupling in electron temperature gradient turbulence

Z. Lin, L. Chen, F. Zonca

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Global gyrokinetic particle simulation and nonlinear gyrokinetic theory find that electron temperature gradient (ETG) instability saturates via nonlinear toroidal coupling, which is a nonlocal interaction in the wave vector space that transfers energy successively from unstable modes to damped modes preferentially with lower toroidal mode numbers. The electrostatic ETG turbulence is dominated by nonlinearly generated radial streamers. The length of the streamers scales with the device size, which is longer than the distance between mode rational surfaces and electron radial excursions. Both fluctuation intensity and transport level at saturation are independent of the streamer length, and are much smaller than the mixing length estimates. © 2005 American Institute of Physics.
Original languageEnglish
Article number056125
Pages (from-to)1 - 10
Number of pages10
JournalPhysics of Plasmas
Issue number5
Publication statusPublished - May 2005
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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