中国激光, 2011, 38 (8): 0815001, 网络出版: 2011-07-14   

基于石英球面弯曲晶体的X射线成像研究

Study of X-Ray Backlight Imaging Based on Spherically Bent Quartz Crystal
作者单位
1 重庆大学光电技术及系统教育部重点实验室, 重庆 400030
2 中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
摘要
为了诊断惯性约束聚变的聚爆靶的尺寸、形状、分布和均匀性等情况,利用X射线布拉格衍射理论,搭建了基于球面弯曲晶体的X射线背光成像系统。其核心元件是α-石英球面弯晶,α-石英晶体性质稳定,结构完整,反射率和分辨率高。弯曲晶体尺寸为65 mm×20 mm,弯曲半径为143.3 mm。利用该背光成像系统进行了单色X射线背光成像实验。成像物体为3×3阵列的正方形不锈钢网格,利用接收装置磷屏成像板,得到清晰的Cr Kα X射线背光源二维空间分辨,在9.6 mm×28.7 mm的视场范围内,其像的空间分辨率大约为83.3 μm。实验结果表明α-石英球面弯曲晶体适合于X射线的背光诊断研究。
Abstract
In order to diagnose the distribution, stability, dimensions and plasma uniformity of pellet implosion in the inertial confinement fusion (ICF), an X-ray backlight imaging system based on spherically bent crystal has been set up using the X-ray Bragg diffraction theory. The primary component of the imaging system is the spherically bent α-quartz crystal which has characteristics of stability, complete structure, high reflectivity and resolution. The crystal dimension is 65 mm×20 mm and the curvature radius is 143.3 mm. Monochromatic X-ray backlight imaging experiment using the imaging system has been carried out. In the experiment, the object is a 3×3 array square stainless steel grid. It obtains two-dimensional monochromatic X-ray backlight image of chrome in imaging plane. The X-ray backlight imaging system based on spherically bent crystal provides an approximate 83.3 μm spatial resolution and a 9.6 mm×28.7 mm field of views. It is demonstrated that this backlight imaging system could be used for monochromatic X-ray backlighting imaging diagnosis.

刘利锋, 肖沙里, 毋玉芬, 钱家渝, 施军, 刘慎业, 韦敏习, 陈伯伦. 基于石英球面弯曲晶体的X射线成像研究[J]. 中国激光, 2011, 38(8): 0815001. Liu Lifeng, Xiao Shali, Wu Yufen, Qian Jiayu, Shi Jun, Liu Shenye, Wei Minxi, Chen Bolun. Study of X-Ray Backlight Imaging Based on Spherically Bent Quartz Crystal[J]. Chinese Journal of Lasers, 2011, 38(8): 0815001.

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