辐射驱动下主动式高精度冲击波速度精密诊断技术

王峰; 彭晓世; 刘慎业; 蒋小华; 徐涛; 丁永坤

doi:doi:10.3788/aos201232.1114004

光学学报, 2012, 32 (11): 1114004, 网络出版: 2012-08-17

辐射驱动下主动式高精度冲击波速度精密诊断技术

Active High-Accuracy Shock-Wave Velocity Measure Technique in Laser Indirect-Drive Experiment

论文大纲

王峰 ^*彭晓世刘慎业蒋小华徐涛丁永坤

作者单位

中国工程物理研究院激光聚变研究中心, 四川绵阳 621900

测量冲击波速度烧蚀预热 measurement shock-wave velocity ablation preheat effect

摘要

激光加载可以产生比气泡加载更高的压力，是高压状态方程研究中一种新的加载方式。在激光加载高压状态方程(EOS)研究中，台阶靶是常用的靶型。针对传统台阶靶存在的预热膨胀问题，提出了使用主动式任意反射面速度干涉仪(VISAR)进行台阶靶预热和冲击波测量的方法。该技术利用条纹图移动量计算厚度增加量，利用冲击波到达自由面产生条纹跳变的时刻来获得精确的冲击波到达时刻。通过修正已测量台阶厚度与膨胀量，可以获得更加精确的台阶厚度值。通过精确的时间间隔可以得到冲击波传输的时间。在匀速传输的条件下可以获得高精度的冲击波传输速度。该方法在辐射驱动超高压条件下具有很好的适用性，可以为状态方程实验提供高精度的冲击波速度数据。

Abstract

Laser indirect-drive has potential to get ultra-high pressure which is very useful for shock-wave physics. A step target is used to get the equation of state (EOS) data under high pressure with laser drive experiment. Since there are preheat effects in step targets, an active velocity interferometer system for any reflector (VISAR) is presented to adjust the thickness change. The thickness change can be obtained after the calculation of fringe changes. The step thickness can be achieved accurately after corrected preheat effect on the thickness. Under conditions for the steady velocity in step target, shock-wave velocity can be gained from experimental data. This technique is suitable for the shock-wave experiment with radiation drive, which provides data of the shock-wave velocity for equation of state with high accuracy.

参考文献

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王峰, 彭晓世, 刘慎业, 蒋小华, 徐涛, 丁永坤. 辐射驱动下主动式高精度冲击波速度精密诊断技术[J]. 光学学报, 2012, 32(11): 1114004. Wang Feng, Peng Xiaoshi, Liu Shenye, Jiang Xiaohua, Xu Tao, Ding Yongkun. Active High-Accuracy Shock-Wave Velocity Measure Technique in Laser Indirect-Drive Experiment[J]. Acta Optica Sinica, 2012, 32(11): 1114004.

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