Abstract
We report the first data based value of the kinematic viscosity in high energy density plasmas by using a rigorous statistical analysis of experimental data of fluctuations spectra in Rayleigh-Taylor mixing. The fluctuations spectra are found to be accurately described by compound functions capturing both self-similar and scale-dependent spectral parts. The self-similar dynamics have steep spectra, strong correlations and weak fluctuations. Characteristics of the scale-dependent dynamics directly determine the value of the kinematic viscosity. Our results explain the experimental observations, elucidate their consistency with group theory and other experiments, and chart research perspectives.
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