Z箍缩装置的单色背光成像

Monochromatic backlight imaging on Z-pinch facility

基于晶体布拉格衍射理论,搭建了X射线背光成像系统,核心色散元件为α-石英球面弯曲晶体。在中国工程物理研究院流体物体研究所"阳"加速器上进行了单色X射线背光成像实验,背光源为箍缩负载Al丝阵聚爆产生的激光等离子体X射线,成像物体为厚度100μm的不锈钢网格阵列,接收装置得到Al丝阵聚爆的等离子体X射线2维分辨的空间单色成像,其空间分辨力为75μm。目前实验中采用Al膜作为滤片,对Al的类He跃迁辐射线系都有吸收,得到的背光成像信噪比较小。

An X-ray backlight imaging system using spherically bent crystal has been set up based on the X-ray Bragg diffraction theory.The primary component of the system is a spherically bent α-quartz crystal whose curvature radius is 143 mm.The monochromatic X-ray backlight imaging experiment using the imaging system has been carried out on the anode accelerator of Institute of Fluid Physics,China Academy of Engineering Physics（CAEP）.In the experiment,the backlighter is a laser-produced plasma X-ray source created using Al wire arrays implosion;the test object is stainless steel wires of diameter of 100 μm and period of 500 μm;the X-ray film is used to obtain the two-dimensional monochromatic X-ray backlight images.The imaging system provides a spatial resolution of approximately 75 μm.It can be predicated that the backlight image obtained by employing Al filter has a relatively small signal-to-noise ratio,for Al filter absorbs the X-ray spectrum of the Al plasma He-like radiation.