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在拍瓦级飞秒激光装置上完成了两轮激光驱动甲烷气体靶的实验,用产生的X光源配合SCCD(转换屏+CCD相机)对小型金属器件背光成像,采用经验公式和PIC数值模拟方法分别预估了超热电子温度,得到X光能量分别为377keV和130keV,据此两轮实验分别选择1.3mm和0.8mm厚度的轫致辐射体。分析比较了两轮实验背光成像质量。通过对次轮实验图像中铝、铜金属台阶灰度值曲线的分析求得X光的能量分别为49keV和92keV,这表明采用PIC数值模拟方法得到的X光能量更加符合实验结果。
Experiments on two laser driven methane gas targets were completed on a watt-level femtosecond laser device. The X-ray source and SCCD (conversion screen + CCD camera) were used to image the small metal backlights. The empirical formula and the PIC numerical simulation method Respectively predicted the hot electron temperature, the X-ray energy was 377keV and 130keV, respectively, according to the two rounds of experiment were selected 1.3mm and 0.8mm thickness of the bremsstrahlung. Analysis and comparison of two rounds of experimental backlight imaging quality. The energy of X-ray obtained from the grayscale curve of aluminum and copper metal in the second-round experiment image is 49keV and 92keV respectively, which shows that the X-ray energy obtained by PIC numerical simulation is more in line with the experimental results.