The Interaction of Supernova Remnants with Interstellar Clouds: Experiments on the Nova Laser
The Interaction of Supernova Remnants with Interstellar Clouds: Experiments on the Nova Laser
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超新星遗迹与星际云的相互作用：新星激光器实验
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
D. R. Bach
中科院分区：
文献类型：
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作者：
R. Klein;K. Budil;T. Perry;D. R. Bach
强冲击波的相互作用，例如超新星爆炸与星际云的相互作用，是理解星际介质（ISM）被冲击波破坏时的演化和动力学的一个基本重要问题。在这里，我们提出了一系列的缩放新星激光高能量密度实验的结果，调查的演变后，嵌入在低密度介质中的高密度球的强冲击波的通道，从而模拟超新星激波云的相互作用。Nova激光器被用来产生一个强大的（~Mach 10）冲击波，该冲击波沿沿着为750 μm的微型铍激波管传播，该铍激波管填充有模仿ISM的低密度塑料。塑料中嵌入了一个铜微球（直径100 μm），模拟星际云。通过侧位X线摄影诊断了冲击波的形态和演变以及冲击波的轨迹。在这里，我们描述了这种相互作用的实验X射线照相结果，几个云粉碎时间，并将它们与详细的二维和三维辐射流体动力学模拟使用任意拉格朗日和欧拉流体动力学（ALE），以及高分辨率自适应网格细化（AMR）流体动力学。一个关键的结果是第一个实验证据表明，云被破坏的三维非线性弯曲模式不稳定性（Widnall不稳定性），证实了早期的预测与高分辨率的三维计算。
The interaction of strong shock waves, such as those generated by the explosion of supernovae with interstellar clouds, is a problem of fundamental importance in understanding the evolution and the dynamics of the interstellar medium (ISM) as it is disrupted by shock waves. Here we present the results of a series of scaled Nova laser high energy density experiments investigating the evolution of a high-density sphere embedded in a low-density medium after the passage of a strong shock wave, thereby emulating the supernova shock-cloud interaction. The Nova laser was utilized to generate a strong (~Mach 10) shock wave that traveled along a miniature beryllium shock tube, 750 μm in diameter, filled with a low-density plastic emulating the ISM. Embedded in the plastic was a copper microsphere (100 μm in diameter), emulating the interstellar cloud. The morphology and evolution as well as the shock wave trajectory were diagnosed via side-on X-ray radiography. We describe here experimental X-ray radiographic results of this interaction out to several cloud crushing times and compare them to detailed two- and three-dimensional radiation hydrodynamic simulations using both arbitrary Lagrangian and Eulerian hydrodynamics (ALE), as well as high-resolution adaptive mesh refinement (AMR) hydrodynamics. A key result is the first experimental evidence that the cloud is destroyed by a three-dimensional nonlinear bending-mode instability (Widnall instability), confirming earlier predictions with high-resolution three-dimensional calculations.