Role of nonlinear toroidal coupling in electron temperature gradient turbulence

Lin, Z.; Chen, L.; Zonca, F.

doi:10.1063/1.1894766

Role of nonlinear toroidal coupling in electron temperature gradient turbulence

Journal Article · Mon May 09 04:00:00 EDT 2005 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.1894766· OSTI ID:1130341

Lin, Z. ^[1]; Chen, L. ^[2]; Zonca, F. ^[3]

University of California Department of Physics and Astronomy, , Irvine, California 92697; University of California, Irvine
University of California Department of Physics and Astronomy, , Irvine, California 92697
Associazione EURATOM-ENEA sulla Fusione , Cassella Postale 65-00044 Frascati, Italy

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.

Research Organization:: Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)

DOE Contract Number:: FG02-04ER54736

OSTI ID:: 1130341

Report Number(s):: DOE-UCI-ER54736

Journal Information:: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 5 Vol. 12; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

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