Radiography of a K_α X-ray source generated through ultrahigh picosecond laser–nanostructure target interaction  

作　　者：王剑 赵宗清 何卫华 朱斌 董克攻 吴玉迟 张天奎 高牛 周凯南 谢娜 周维民 谷渝秋 

机构地区：[1]Department of Physics, Fudan University [2]Research Center of Laser Fusion, China Academy of Engineering Physics

出　　处：《Chinese Optics Letters》2015年第3期18-21,共4页中国光学快报（英文版）

基　　金：supported by the National Science Foundation of China(Grant Nos.1174259,11175030,11475030,and10905051);the Science and Technology on Plasma Physics Laboratory(Grant No.9140c680306120c68253);the China Academy of Engineering Physics Foundation(Grant No.2011B0102021)

摘　　要：Laser-driven ultrafast X-ray sources are widely used for diagnostic radiography. However, there is a large divergence of fast electrons when they are generated by an intense short-pulse laser interacting with a foil target. We design a nanowire array target to achieve a more compact point X-ray source. Fast electrons are confined and guided by the nanowire array structure in order to generate a Kα source with a small spot size. In our work, the smallest measured source size is comparable to the laser spot size, while the conversion efficiency can reach 2.4 ×10^-4.Laser-driven ultrafast X-ray sources are widely used for diagnostic radiography. However, there is a large divergence of fast electrons when they are generated by an intense short-pulse laser interacting with a foil target. We design a nanowire array target to achieve a more compact point X-ray source. Fast electrons are confined and guided by the nanowire array structure in order to generate a Kα source with a small spot size. In our work, the smallest measured source size is comparable to the laser spot size, while the conversion efficiency can reach 2.4 ×10^-4.

关 键 词：Diagnostic radiography Electron sources NANOWIRES X ray apparatus 

分 类 号：O434.1[机械工程—光学工程]