黑腔辐射谱分布与靶丸掺杂材料的匹配关系研究

在间接驱动惯性约束聚变中，激光与黑腔壁相互作用，产生X射线辐射源烧蚀靶丸，驱动内爆。辐射源中的M带X射线(2-5keV)能在冲击波到达之前将燃料层预热，从而降低靶丸的可压缩性。本项目拟通过模拟研究，在金(Au)表面镀一层高Z材料，降低Au-M带份额，改善辐射源谱分布。选取合适的高Z材料X，使其M带峰值位置与掺杂材料硅(Si)的吸收边（1.8keV）接近，实现掺杂材料Si对此高Z材料M带X射线的有效吸收。通过开展辐射烧蚀实验，实现靶丸的低预热，给出辐射源谱分布与掺杂材料的匹配关系。结合黑腔和掺杂材料来综合考虑，为预热问题的研究提供了新的思路。有望建立评估黑腔和靶丸掺杂材料优劣的方法，为靶设计提供重要参考和依据。

In indirect-drive inertial confinement fusion (ICF), laser light is absorbed by the interior gold walls of the hohlraum and converted to x-ray source which implodes the capsule. The M-band x-rays(2-5keV) can preheat the fuel before the arrival of the shock wave. By study of simulation, high Z-coated Au hohlraum can reduce the Au M-band fraction and improve the radiation spectrum. We plan to find high Z material whose position of M band is closed to the absorption edge of Si dopant（1.8KeV）.So Si dopant can significantly suppress the transport of the high Z material's M-band X-ray. We plan to do experiment and achieve low preheating of target and study matching relation between the radiation spectrum and dopant. Combination of hohlraum and dopant provides a new method for studying preheat effect. It can provide guidance for hohlraum design and target design.