Locality properties of the free energy fluxes in gyrokinetic turbulence

Details Locality properties of the free energy fluxes in gyrokinetic turbulence Locality properties of the free energy fluxes in gyrokinetic turbulence

2012-02-28

arxiv.org/abs/1202.6160v2

Physics

Plasma Physics

4 pages, 3 figures

Scientific paper

The nature of the nonlinear interactions in gyrokinetic (GK) turbulence, driven by an ion-temperature gradient instability, is investigated using numerical simulations of single ion species plasma in three-dimensional flux tube geometry. To account for the level of separation existing between scales involved in an energetic interaction, the degree of locality of the free energy scale flux is analyzed employing Kraichnan's infrared (IR) and ultraviolet locality functions. Due to the nontrivial dissipative nature of GK turbulence, an asymptotic level for the locality exponents, indicative of a universal dynamical regime for GK's, is not recovered and an accentuated non-local behavior of the IR interactions is found instead, in spite of the local energy cascade observed.

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