X射线激光对激光烧蚀薄片靶的阴影成像研究  

Shadow imaging studies on laser-ablated foil target by using an X-ray laser

作　　者：王琛[1] 郑无敌[2] 方智恒[1] 孙今人[1] 王伟[1] 熊俊[1] 傅思祖[1] 顾援[1] 王世绩[1] 乔秀梅[2] 张国平[2] 

机构地区：[1]上海激光等离子体研究所,上海201800 [2]北京应用物理与计算数学研究所,北京100088

出　　处：《物理学报》2010年第7期4767-4773,共7页Acta Physica Sinica

基　　金：国家高技术研究发展计划(批准号:2007AA804701;2007AA804703)资助的课题~~

摘　　要：长脉冲激光辐照烧蚀薄片靶会加速物质进而在靶后表面产生凹坑现象,通过凹坑的实验诊断,配合相关的理论模拟,对理解相关物理过程,校验理论程序的相关参数具有很好的参考价值.利用波长13.9nm的类镍银X射线激光作为探针,诊断了纳秒倍频激光辐照C8H8平面薄片靶产生的等离子体以及加速物质产生的凹坑现象,并利用XRL2D程序对实验现象进行了细致的模拟,电子热传导限流因子选取为0.03时的模拟结果与实验符合比较好.模拟给出凹坑宽度和深度(即薄片加速距离)与实验观测数据定量符合,但是模拟结果无法解释远离焦斑区薄片增厚现象.There is a ＂pit＂ phenomenon in the target surface when long pulse laser ablates the foil target and speeds up the material of target.Laboratorty diagnosis and theoretical simulation of the pit can help us understand the relevant physical processes and check relevant parameters of the procedures.We use 13.9 nm Ni-like Ag X-ray laser as a probe to diagnose the plasma and the pit phenomenon,which is produced by 2ω nanosecond laser irradiation of C8H8 foil target.XRL2D code is used to simulate the experiments.Results show that,when the limiting factor of electron thermal transmittance is 0.03,the simulated pit width and depth（the distance of thin foil accelerated） agree with the results of experiment,but the foil thickening phenomenon in the area far away from the focal spot region cannot be explained the simulation.

关 键 词：等离子体诊断 X射线激光 阴影成像 

分 类 号：O536[理学—等离子体物理]