强激光与粒子束, 2011, 23 (9): 2275, 网络出版: 2011-10-27
Z箍缩装置的单色背光成像
Monochromatic backlight imaging on Zpinch facility
球面弯曲晶体 布拉格衍射 X射线诊断 空间分辨力 spherically bent crystals Bragg diffraction Xray diagnosis spatial resolution
摘要
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100 μm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75 μm。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。
Abstract
An Xray backlight imaging system using spherically bent crystal has been set up based on the Xray Bragg diffraction theory. The primary component of the system is a spherically bent αquartz crystal whose curvature radius is 143 mm. The monochromatic Xray 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 laserproduced plasma Xray 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 Xray film is used to obtain the twodimensional monochromatic Xray 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 signaltonoise ratio, for Al filter absorbs the Xray spectrum of the Al plasma Helike radiation.
刘利锋, 肖沙里, 钱家渝, 刘慎业, 韦敏习, 陈伯伦. Z箍缩装置的单色背光成像[J]. 强激光与粒子束, 2011, 23(9): 2275. Liu Lifeng, Xiao Shali, Qian Jiayu, Liu Shenye, Wei Minxi, Chen Bolun. Monochromatic backlight imaging on Zpinch facility[J]. High Power Laser and Particle Beams, 2011, 23(9): 2275.