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在间接驱动的激光惯性约束聚变实验中,激光辐照产生的X射线能流的测量非常重要,它可以推测出黑腔的辐射温度和激光腔靶的耦合效率,一般通过平响应X射线探测器得到不同角分布的辐射流数据。通过对平响应复合滤片的结构参数进行优化设计,提高了平响应X射线探测器的测量精度。研究了复合滤片中薄金层、厚金层和孔面积比等结构参数对X射线探测器响应平整度的影响规律。从实验结果中可以得出:滤片和金阴极的标定数据和理论结果基本一致,并且薄金层的厚度对探测器整体响应的平整度起到主要作用,厚金层厚度和孔面积比影响较小,优化后探测器的平响应度达到5%,与理论设计相一致,此时的薄金层厚度、厚金层厚度和孔面积比分别为50 nm、380 nm和1:6.1。
In the indirectly driven laser inertial confinement fusion experiment, the measurement of X-ray energy flux generated by laser irradiation is very important. It can infer the radiation temperature of the black cavity and the coupling efficiency of the laser cavity target, usually through the flat response X-ray detector Radiation flow data with different angular distributions are obtained. By optimizing the structural parameters of flat response composite filter, the measuring accuracy of flat response X-ray detector is improved. The influence of structure parameters such as thin gold layer, thick gold layer and hole area ratio on the response flatness of X-ray detector was studied. From the experimental results, it can be concluded that the calibration data of the filter and the gold cathode are basically the same as the theoretical results, and the thickness of the thin gold layer plays a major role in the flatness of the overall response of the detector. The thick gold layer thickness and the hole area ratio influence The smaller, optimized responsivity of the detector is 5%, in agreement with the theoretical design. The thin gold layer thickness, the thickness of the gold layer and the hole area ratio are 50 nm, 380 nm and 1: 6.1 respectively.