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飞秒激光驱动纳米多孔靶产生X射线转化效率实验研究

Experimental study of the X-ray conversion efficiency in femtosecond laser-irradiated nano-foam target
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摘要 利用多孔结构原理,研制了厚度为100μm、孔隙率为70%的纳米多孔铜靶,密度比为固体铜的30%。实验在中国工程物理研究院"星光Ⅲ"激光装置飞秒激光束上进行,激光功率密度大于1.6×1018 W/cm^2,脉宽为30fs。利用16bit单光子CCD获取了X射线能谱,测得铜Kα线光子产额为2.9×108 photon·sr^(-1)·s^(-1),转换效率为0.008 38%。与压制加工的平面Cu靶相比,多孔结构靶的X射线产额约为平面靶的1.8倍,表明纳米多孔结构能够有效增强飞秒激光能量吸收,提高超热电子和X射线转化效率。 Based on a porous structure principle, the nano-foam Cu targets were developed with a thickness of 100 btm,a porosity of 70%, the density ratio of 30% solids of Cu. Experiments had been carried out on XG-Ⅲ laser facility in Laser Fusion Research Center, China Academy of Engineering Physics. The minimum laser intensity was more than 1.6 × 10^18 W/cm2 with a duration of 30 fs. A single-photon-counting X-ray CCD was used to measure Ka spectrum of the X-ray source. The X-ray yield was counted to achieve Ka peak photons of 2.9×10^8 photos · sr^-1· s^-1 from femtosecond irradiated nano-foam Cu. The Ka X- ray conversion efficiency (CE) reaches the maximum value 0. 008 38%. Compared to the pressed Cu foil target, the average X-ray yields of nano-foam structures increased by 1.8 times. The results show that nano-foam structure can effectively enhance the en- ergy absorbability of femtosecond laser and improve the conversion efficiency from ultra intense laser to hot electron and X-ray.
出处 《强激光与粒子束》 EI CAS CSCD 北大核心 2016年第10期7-11,共5页 High Power Laser and Particle Beams
基金 国家高技术发展计划项目 强场激光物理国家重点实验室(中国科学院上海光学精密机械研究所)项目 重庆市教委科学技术研究项目(KJ120710) 国家智能制造服务国际科技合作基地项目(1456043) 重庆市发展信息管理工程技术研究中心开放基金项目(gczxkf201503)
关键词 激光与物质相互作用 纳米多孔材料 转化效率 X射线光源 laser interaction with matter nano-foam materials conversion efficiency X-ray source
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