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Uncertainties in radiation flow experiments

机译：辐射流实验的不确定性

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摘要

Although the fundamental physics behind radiation and matter flow is understood, many uncertainties remain in the exact behavior of macroscopic fluids in systems ranging from pure turbulence to coupled radiation hydrodynamics. Laboratory experiments play an important role in studying this physics to allow scientists to test their macroscopic models of these phenomena. However, because the fundamental physics is well understood, precision experiments are required to validate existing codes already tested by a suite of analytic, manufactured and convergence solutions. To conduct such high-precision experiments requires a detailed understanding of the experimental errors and the nature of their uncertainties on the observed diagnostics. In this paper, we study the uncertainties plaguing many radiation-flow experiments, focusing on those using a hohlraum (dynamic or laser-driven) source and a foam-density target. This study focuses on the effect these uncertainties have on the breakout time of the radiation front. We find that, even if the errors in the initial conditions and numerical methods are Gaussian, the errors in the breakout time are asymmetric, leading to a systematic bias in the observed data. We must understand these systematics to produce the high-precision experimental results needed to study this physics. (C) 2016 Elsevier B.V. All rights reserved.
机译：尽管了解了辐射和物质流的基本物理原理，但从纯湍流到耦合辐射流体动力学，系统中宏观流体的确切行为仍然存在许多不确定性。实验室实验在研究这种物理学方面起着重要作用，以使科学家能够测试他们对这些现象的宏观模型。但是，由于基本物理学已被很好地理解，因此需要进行精确的实验来验证已经由一组分析，制造和收敛解决方案测试过的现有代码。要进行这样的高精度实验，需要对实验错误及其所观察到的诊断信息不确定性的性质有详细的了解。在本文中，我们研究了许多辐射流实验带来的不确定性，重点是那些使用hohlraum（动态或激光驱动）源和泡沫密度目标的不确定性。这项研究的重点是这些不确定性对辐射锋面爆发时间的影响。我们发现，即使初始条件和数值方法中的误差是高斯误差，突围时间中的误差也是不对称的，从而导致观测数据出现系统性偏差。我们必须了解这些系统性知识，才能产生研究该物理学所需的高精度实验结果。 （C）2016 Elsevier B.V.保留所有权利。

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