Experimental demonstration of an inertial collimation mechanism in nested outflows.
Experimental demonstration of an inertial collimation mechanism in nested outflows.
复制标题
嵌套流出中惯性准直机制的实验演示。
DOI：
10.1103/physrevlett.112.155001
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发表时间：
2014
影响因子：
8.6
通讯作者：
Eric G. Blackman
中科院分区：
文献类型：
--
作者：
R. Yurchak;A. Ravasio;A. Pelka;S. Pikuz;E. Falize;Tommaso Vinci;M. Koenig;B. Loupias;A. Benuzzi;M. Fatenejad;P. Tzeferacos;D. Lamb;Eric G. Blackman
在由吸积提供动力的天体物理源中，中心外流和周围风之间的相互作用是常见的。了解这种相互作用如何有助于对准内部中心流出，对于评估天体物理喷流形成范式是很有意义的。在此背景下，我们研究了由长脉冲高能激光聚焦到固体靶上产生的两个嵌套超音速等离子体流之间的相互作用。利用专用相位板对焦点处的能量分布进行整形，形成了一个嵌套的几何结构。用光学和X射线诊断法研究了相互作用的流动。实验结果和数值流体力学模拟确实证明了强准直喷流的形成。我们的工作从实验上证实了以前的天体物理理论研究中提出的“激波聚焦惯性约束”机制。
Interaction between a central outflow and a surrounding wind is common in astrophysical sources powered by accretion. Understanding how the interaction might help to collimate the inner central outflow is of interest for assessing astrophysical jet formation paradigms. In this context, we studied the interaction between two nested supersonic plasma flows generated by focusing a long-pulse high-energy laser beam onto a solid target. A nested geometry was created by shaping the energy distribution at the focal spot with a dedicated phase plate. Optical and x-ray diagnostics were used to study the interacting flows. Experimental results and numerical hydrodynamic simulations indeed show the formation of strongly collimated jets. Our work experimentally confirms the "shock-focused inertial confinement" mechanism proposed in previous theoretical astrophysics investigations.