Laser clipping effect and consequent background X-ray based on planar hole-target
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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800 m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1000 m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。Abstract: The laser clipping effect and the consequent background X-ray are researched by planar hole-target on Shenguang-Ⅲ and 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 800 m 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 1000 m 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.
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