基于平面孔靶对本底X光及激光挂边的研究  

Laser clipping effect and consequent background X-ray based on planar hole-target

作　　者：李琦[1,2] 李三伟[1] 郭亮[1] 李志超[1] 杨冬[1] 

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900 [2]清华大学工程物理系,北京100084

出　　处：《强激光与粒子束》2016年第8期30-34,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(11305159;11435011)

摘　　要：在神光-Ⅲ和神光-Ⅲ原型装置上基于平面孔靶研究了激光挂边及本底X光发射情况。能量卡计直接测量激光挂边份额;X光针孔相机给出本底X光发射的空间图像;平响应X光探测器测量本底X光的强度。实验结果表明:在神光-Ⅲ原型上800μm注入孔时,针孔图像中本底X光计数与黑腔漏失辐射流计数的比值约为1.2%;在神光-Ⅲ上1000μm注入孔时,平响应X光探测器测得的本底X光干扰的峰值约为2.7%,能量卡计测得的激光挂边份额约为2.6%。此外,根据神光-Ⅲ的实验参数模拟计算了激光挂边份额和本底X光的干扰。与实验结果的对比说明了该模型的正确性,可以用该模型评估激光挂边及本底X光发射情况,同时可以用该模型指导注入孔尺寸的选择。The laser clipping effect and the consequent background X-ray are researched by planar hole-target on Shenguang-Ⅲand Shenguang-Ⅲ prototype.A laser energy detector is used to measure the laser clipping ratio directly,an X-ray pinhole camera attains the spatial image of the background X-ray,and flat-response X-ray detectors measure the intensity of the background X-ray.The experiment result shows that the ratio of the background X-ray to the X-ray exiting from a hohlraum is about 1.2% by X-ray pinhole camera with 800μm LEH on Shenguang-Ⅲ prototype;the background X-ray contributes about 2.7% overestimation on the X-ray exiting from a hohlraum and the laser clipping ratio is about 2.6% by flat-response X-ray detectors with 1000μm LEH on Shenguang-Ⅲ.In addition,the laser clipping ratio and the consequent background X-ray are simulated according to the condition of Shenguang-Ⅲ.Comparison to the experiment result illustrates the validity of the simple model.So,the model could be used to estimate the laser clipping ratio and the consequent background X-ray,and the model could guide to choose the size of the LEH.

关 键 词：平面孔靶 激光挂边 本底X光 X光针孔相机 平响应X光探测器 

分 类 号：TL67[核科学技术—核技术及应用]