Symmetry breaking of ion temperature gradient mode structure: From local to global analysis

Z.X. Lu, E. Fable, W.A. Hornsby, C. Angioni, A. Bottino, Ph. Lauber, F. Zonca

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Abstract

The 2D mode structure symmetry breaking of the ion temperature gradient mode is studied analytically and numerically based on the mixed initial-value-eigenvalue approach, the Gyrokinetic PIC code ORB5 and the gyrokinetic Eulerian code GKW. The radial propagation and amplitude variation, in terms of the real and imaginary parts of the generalized "tilting parameter" θk, are treated in the framework of the Mode Structure Decomposition approach. The radial symmetry breaking is shown to be intimately coupled to the parallel symmetry breaking. In particular, I m { θ k } can lead to the increase in the local growth rate and the absolute value of the real frequency, as well as to parallel symmetry breaking. The complex θkcan be measured in global simulations and accounted for in local simulations. This provides a way to include global effects related to the mode radial propagation and the intensity gradient in local descriptions and can be important for the study of momentum transport.
Original languageEnglish
Article number042502
Pages (from-to)-
JournalPhysics of Plasmas
Volume24
Issue number4
DOIs
Publication statusPublished - 1 Apr 2017
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

Cite this

Lu, Z. X., Fable, E., Hornsby, W. A., Angioni, C., Bottino, A., Lauber, P., & Zonca, F. (2017). Symmetry breaking of ion temperature gradient mode structure: From local to global analysis. Physics of Plasmas, 24(4), -. [042502]. https://doi.org/10.1063/1.4978947