Optimization of x-ray emissions with Gd + Au + Gd sandwich design
Optimization of x-ray emissions with Gd + Au + Gd sandwich design
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DOI：
10.1063/5.0022716
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发表时间：
2021-02
期刊：
影响因子：
1.6
通讯作者：
Liling Li;Shaoen Jiang;Hang Li;Jianhua Zheng;L. Jing;Lu Zhang;Zhiwei Lin;L. Kuang;Dong Yang;Feng Wang;Hai-En He;Jiamin Yang;Bao-han Zhang
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文献类型：
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作者：
Liling Li;Shaoen Jiang;Hang Li;Jianhua Zheng;L. Jing;Lu Zhang;Zhiwei Lin;L. Kuang;Dong Yang;Feng Wang;Hai-En He;Jiamin Yang;Bao-han Zhang
用FLYCHK程序研究了钆（Gd）和金（Au）的x射线发射率。结果表明，Gd的m波段小于2 keV， Gd在低温下具有较高的x射线发射率。因此，我们提出了Gd + Au + Gd夹层设计来提高x射线转换效率（CE）。在激光强度为1 × 1015 W/cm2的条件下，衍射能谱提高了11% ~ 17%，得到了优化的x射线光谱。CE的增强主要是由于软x射线通量（0 keV - 2 keV）的增强。此外，高能x射线通量（2 keV - 5 keV）低于Au。特别是在早期阶段，激光烧蚀Gd层，而Au层的温度不足以产生m波段发射。因此，高能x射线通量相当低。夹层设计不仅有效地利用了Gd在特定条件下较高的x射线发射率，而且简化了靶材的制作，这是非常重要的。此外，Gd还可用于未来贫铀热室的优化设计。
The x-ray emissivity of gadolinium (Gd) and gold (Au) has been studied using the FLYCHK code. The results show that the Gd M-band is lower than 2 keV and that Gd has a higher x-ray emissivity at low temperature. Thus, we proposed a Gd + Au + Gd sandwich design to improve the x-ray conversion efficiency (CE). Under a laser intensity of 1 × 1015 W/cm2, a 11%–17% enhancement of the CE and an optimized x-ray spectrum were achieved in one-dimensional simulation. The enhancement of the CE is mainly due to an enhancement of the soft x-ray flux (0 keV–2 keV). In addition, the high energy x-ray flux (2 keV–5 keV) is lower than that of Au. Particularly at an early stage, the laser ablates the Gd layer, and the temperature of the Au layer is insufficient for producing an M-band emission. Thus, the high energy x-ray flux is rather low. A sandwich design not only takes advantage of the higher x-ray emissivity of Gd under specific conditions in an efficient manner but also simplifies the target fabrication, which is important. In addition, Gd can also be used to optimize the future design of depleted uranium Hohlraum.