Multimode instability evolution driven by strong, high-energy-density shocks in a rarefaction-reflected geometry
Multimode instability evolution driven by strong, high-energy-density shocks in a rarefaction-reflected geometry
复制标题
稀疏反射几何结构中强高能量密度冲击驱动的多模不稳定性演化
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
P. Bradley
中科院分区：
文献类型：
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作者：
C. Stefano;A. Rasmus;F. Doss;K. Flippo;J. Hager;J. Kline;P. Bradley
我们提出了一个实验，使用激光产生bbb10毫巴的冲击压力，然后我们用它来驱动二维多模摄动界面上的richmyer - meshkov和Rayleigh-Taylor生长。该平台的主要特点是，我们可以精确地再现从迭代到迭代的扰动，便于分析，并且激光允许我们产生非常强的冲击，在系统中创建等离子体状态。我们还实现了一种贝叶斯技术来分析多模光谱。这种技术使我们能够得出关于频谱的定量结论，即使在存在显著噪声的情况下。例如，我们测量了种子模式中包含的信号随时间的变化，以及这些模式的初始增长率转变为频谱的总体饱和行为。
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.