激光驱动X光背光照相技术在金属靶微层裂研究中的应用探索

Exploration of laser-driven X-ray backlighting applied in research of micro-spalls of metal target

利用神光Ⅱ装置发射强激光一方面对铝靶进行烧蚀加载,另一方面驱动铜背光靶发射X光对铝靶微层裂产物进行针孔背光照相,结果获得了可忽略动态模糊的高清晰照片,标准丝阵检验表明分辨率优于40μm。铝靶微层裂产物照片清晰显示,靶破碎存在不同分区,这直观揭示了靶破碎的不同机制。实验成功验证了激光驱动X光背光照相技术在金属靶微层裂研究中存在重要的应用前景。

Micro-spall problem of shock-melted materials is an important scientific issue in shock physics.This paper examines the application of the advanced laser-driven X-ray backlighting technique in the study of this problem.High energy laser beams were launched by SGⅡto drive the aluminum physical target and the copper backlighting target.The X-ray emitted from the backlighting target was directed to pass through a pinhole to take the radiograph of the microspall products.High-quality radiograph was finally obtained,whose spatial resolution was found to be greater than 40μm via the examination of standard grids.Moreover,the radiograph shows clearly the products can be divided into different regions,which directly reveals different mechanism of the fragmentation of the target.The success of our exploring experiments demonstrate the prospect of the application of the technique in the micro-spall study.