双荧光层靶Kα线强度比诊断靶内超热电子温度
Diagnosis of hot electron temperature by ratio of Kα lines from two-layer fluorescent target
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摘要: 利用双荧光层复合靶产生的Kα特征线强度比诊断了靶内超热电子的温度，即通过实验测量复合靶中两种不同材料荧光层辐射出的Kα特征线强度比，结合ITS3.0程序模拟结果，对超热电子温度进行诊断。将诊断结果与实验中利用电子磁谱仪测量的超热电子温度进行了比较，二者基本一致。结果表明，选取适当的荧光层靶厚，可以利用双荧光层复合靶产生的Kα特征线强度比对靶内的超热电子温度进行诊断。Abstract: An approach for fast ignition of laser fusion is to use hot electrons for heating, and the temperature is an important parameter to characterize the hot electrons. The temperature of the hot electrons is diagnosed by experimentally measuring the intensity ratio of Kα characteristic lines emitted from a two-layer fluorescent target in combination with a Monte-Carlo simulation. The temperature of the hot electrons measured with this method is compared with that directly measured by a magnetic spectrometer for the same shot, and a good agreement is obtained. The results show that, by choosing appropriate fluorescent layer materials and target thickness, the temperature of the hot electrons inside the target can be measured by the intensity ratio of the Kα characteristic lines.
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Key words:
- ultrashort ultraintense laser /
- solid target /
- hot electrons /
- kα characteristic line
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