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Signature of a universal statistical description for drift-wave plasma turbulence
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.Comment: 4 pages, 5 figure
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