Multimode instability evolution driven by strong, high-energy-density shocks in a rarefaction-reflected geometry

摘要

We present an experiment using lasers to produce a shock pressure of >10 Mbar, which we then use to drive Richtmyer-Meshkov and Rayleigh-Taylor growth at a 2D multimode perturbed interface. Key features of this platform are that we can precisely reproduce the perturbation from iteration to iteration of the experiment, facilitating analysis, and that the lasers allow us to produce very strong shocks, creating a plasma state in the system. We also implement a Bayesian technique to analyze the multimode spectra. This technique enables us to draw quantitative conclusions about the spectrum, even in the presence of significant noise. For instance, we measure the signal contained in the seeded modes over time, as well as the transition of the initial growth rate of these modes into the overall saturation behavior of the spectrum. Published by AIP Publishing.