强激光与粒子束, 2012, 24 (12): 2837, 网络出版: 2013-01-14  

飞秒激光作用下质子产额及空间分布

Yield and spatial distributions of femtosecond laser-produced protons
作者单位
1 四川理工学院 理学院, 四川 自贡 643000
2 辽宁医学院 物理教研室, 辽宁 锦州 121004
3 成都医学院 物理教研室, 四川 成都 610500
4 中国工程物理研究院 激光聚变研究中心, 四川 绵阳 621900
摘要
在超短超强激光装置SILEX-Ⅰ上,利用HD810辐射变色膜在靶背法线方向测量了质子产额及空间分布。测量结果显示: 光学密度与质子流量密切相关,光学密度越大,质子流量就越大; 当C8H8厚度相同,Cu厚度增加时,质子产额随辐射变色膜的光学密度平均值减小而减小; 当靶相同,激光功率密度越小时,光学密度平均值就越小,则质子产额也越小; 实验中还得到了质子呈环状、成丝和圆盘状结构的空间分布,该空间分布的大小与激光焦斑大小无关。
Abstract
For studying the yield and spatial distributions of protons produced in the interaction of femtosecond laser with plasmas, protons behavior at the normal direction of the rear surface of the target irradiated by ultra-intensity pulse laser irradiated solid targets was explored on SILEX-I laser facility. The yield and spatial distributions of the protons with different target thicknesses were recorded by radiochromic film (RCF) HD810. The results show that the optics density (OD) is closely correlated with the protons flux, OD values increase with the increasing of proton beam flux; For fixed thickness of C8H8 layer, the proton beam flux and yield of protons and OD of RCF decrease with the increasing Cu layer thickness; for the same thickness of targets, the OD and yield of protons decrease with the decreases of laser intensity;And the corresponding spatial profile of proton beam shows ring-, filament-, and disc-like distribution. The size of the distribution is independent of laser focus.

唐翠明, 王昌军, 王亚平, 王光昶, 张建炜, 郑志坚. 飞秒激光作用下质子产额及空间分布[J]. 强激光与粒子束, 2012, 24(12): 2837. Tang Cuiming, Wang Changjun, Wang Yaping, Wang Guangchang, Zhang Jianwei, Zheng Zhijian. Yield and spatial distributions of femtosecond laser-produced protons[J]. High Power Laser and Particle Beams, 2012, 24(12): 2837.

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