Optimization of beam configuration for direct-driven fusion based on ICF indirect-driven laser facility
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摘要: 为了增加ICF激光驱动器的灵活性，使其可满足多种聚变点火方式，激光驱动器激光打靶角度的优化设计应以间接驱动为主，同时兼顾直接驱动。以神光Ⅲ主机装置为例，基于已有的间接驱动激光打靶角度设计，用球谐模和三维辐照场方法，完成了兼顾直接驱动打靶角度的优化，结果表明优化设计的打靶角度可实现小于1%的球靶表面辐照均匀性。同时分析了激光参数对辐照性能的影响，并获得了满足直接驱动要求的陡边小焦斑设计。Abstract: To increase the flexibility of ICF laser facility and meet the requirements of indirect-driven and direct-driven fusions, the beam configuration should be optimized. This paper takes the Shenguang Ⅲ as an example facility which was originally designed for indirect-driven fusion. The beam configuration for direct-driven fusion is optimized through spherical-harmonic mode and three-dimensional irradiation field analysis. The optimization results show that the irradiation uniformity of the sphere target surface is less than 1%. Then irradiation uniformity and coupling efficiency are calculated with different laser profiles. The small and steep spot which direct-driven fusion requires is also obtained based on the beam configuration.
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