Signature of a universal statistical description for drift-wave plasma turbulence

Details Signature of a universal statistical description for drift-wave plasma turbulence Signature of a universal statistical description for drift-wave plasma turbulence

2010-08-19

arxiv.org/abs/1008.3214v1

Phys. Plasmas 17, 110702 (2010)

Physics

Plasma Physics

4 pages, 5 figures

Scientific paper

10.1063/1.3505824

This Letter provides a theoretical interpretation of numerically generated probability density functions (PDFs) of intermittent plasma transport events. Specifically, nonlinear gyrokinetic simulations of ion-temperature-gradient turbulence produce time series of heat flux which exhibit manifestly non-Gaussian PDFs with enhanced tails. It is demonstrated that, after the removal of autocorrelations, the numerical PDFs can be matched with predictions from a fluid theoretical setup, based on the instanton method. This result points to a universality in the modeling of intermittent stochastic process, offering predictive capability.

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