强激光与粒子束, 2014, 26 (2): 024004, 网络出版: 2014-03-31   

诊断LiF单晶弹性变形的瞬态X射线衍射

Transient X-ray diffraction to diagnose elastic deformation of shocked lithium fluoride single crystal
作者单位
1 中国工程物理研究院 流体物理研究所, 四川 绵阳 621900
2 光电技术及系统教育部重点实验室(重庆大学), 重庆 400030
摘要
利用瞬态X射线衍射技术对LiF单晶沿晶向[100] 方向冲击加载的晶格变形进行了诊断研究。实验在神光Ⅱ装置的球形靶上进行, 北四路激光驱动Cu靶获得的类He线作为X射线背光源, 第九路为加载光源, 对大小为7 mm×7 mm、厚300 μm的受激光加载的LiF单晶衍射, 实验获得了LiF单晶晶面(200)压缩和未压缩状态的衍射信号。实验结果表明: LiF单晶在激光沿[100] 方向冲击加载下, 晶格发生了弹性变形, (200)晶面间距变小, 衍射线上移, 晶格压缩量为11%; 该瞬态X射线衍射技术可用于冲击加载下的微观动态响应特性测量。
Abstract
Transient X-ray diffraction was used to diagnose the elastic deformation of the LiF single crystal which was shocked along the [100] direction. The experiment was implemented in Shenguang Ⅱ. High-intensity lasers irradiated a thin Cu foil to generate helium-like rays as X-ray source, another laser beam irradiated LiF single crystal which was 7 mm×7 mm in size, 300 μm in thickness as the shocked source. Image plate recorded the shocked diffraction signal of the lattice plane (200) as well as the unshocked signal. The experimental results show that the crystal lattice is compressed, lattice spacing in (200) decreases to result in shifting upwards. The positions of the diffraction lines associated with the (200) lattice plane indicate the compression along [100] direction by 11%. What’s more, the results show that it is useful for diagnosing the microscopic dynamic response of the material by transient X-ray diffraction.

王海容, 肖沙里, 阳庆国, 叶雁, 李牧, 李俊, 彭其先, 李泽仁. 诊断LiF单晶弹性变形的瞬态X射线衍射[J]. 强激光与粒子束, 2014, 26(2): 024004. Wang Hairong, Xiao Shali, Yang Qingguo, Ye Yan, Li Mu, Li Jun, Peng Qixian, Li Zeren. Transient X-ray diffraction to diagnose elastic deformation of shocked lithium fluoride single crystal[J]. High Power Laser and Particle Beams, 2014, 26(2): 024004.

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