Laser驱动冲击的模拟折射增强X射线摄影
Simulated Refraction-Enhanced X-Ray Radiography of Laser-Driven Shocks
摘要：
折射增强的X射线照相术（REXR）用于推断由平面塑料箔中的多个尖峰脉冲发射的多个冲击波的冲击波位置。这包括在冲击波合并之前定位冲击波，在早期和激光脉冲的主要驱动期间，这对于任何反射器的速度干涉仪系统都是不可能的。本文中提出的REXR模拟表明，有必要将X射线的折射和衰减与适当的不透明度和折射率表一起解释实验图像。模拟REXR显示出与OMEGA激光设备上进行的冲击波成像实验的良好一致性。REXR可以应用于设计多尖脉冲，更好地了解冲击位置。这将有利于获得惯性约束聚变内爆所需的材料。
英文摘要：
Refraction-enhanced x-ray radiography (REXR) is used to infer shock-wave positions of more than one shock wave, launched by a multiple-picket pulse in a planar plastic foil. This includes locating shock waves before the shocks merge, during the early time and the main drive of the laser pulse that is not possible with the velocity interferometer system for any reflector. Simulations presented in this paper of REXR show that it is necessary to incorporate refraction and attenuation of x rays along with the appropriate opacity and refractive-index tables to interpret experimental images. Simulated REXR shows good agreement with an experiment done on the OMEGA laser facility to image a shock wave. REXR can be applied to design multiple-picket pulses with a better understanding of the shock locations. This will be beneficial to obtain the required adiabats for inertial confinement fusion implosions.
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