材料特性对微纳结构靶中强流电子束输运的影响研究

超短超强激光和固体相互作用具有重要的科学研究和工程应用价值，其产生的强流高能电子束可广泛应用于离子加速、新型X射线源等领域。微纳结构靶因相较于平面靶具有激光能量吸收率高、电子束准直效果好等优势，近年来在国内外引起了广泛关注和研究兴趣。靶体结构对强流电子束产生和输运的影响已得到了大量研究，然而在实际相互作用时，靶材料特性也将显著影响电子束的特性。因此在已有的靶结构研究基础上，配合靶材料属性并进行整体优化，有望进一步改善超热电子品质。本项目拟通过对微纳结构靶的材料属性优化来实现对电子束特性的操控，获得产生高流强、高输运效率、高准直超热电子束的微纳结构靶物理方案。本项目将结合理论分析、数值模拟和实验研究手段，首先从理论和数值模拟上深化对强激光与微纳结构靶相互作用动理学过程的认识，进而理论模拟配合实验进行优化设计，并最终实现对强流电子束的有效调控。

Interactions between ultrashort ultra-intense laser and solid targets are important for scientific researches and industrial applications. The generation of high current fast electrons can be widely used in ion acceleration, novel X-ray sources and other fields. In recent years, nano-structured targets have attracted worldwide interests for their advantages including high laser absorption efficiency and collimated electron beam over planar targets. Previous studies have deeply investigated the effects of target construction on the generation and transport of high current electrons, while the material characteristics can profoundly influence the electron properties during realistic interactions. Therefore, the overall optimization of target material and structure is expected to further improve the electron quality. In this project, we propose to optimize the material of nano-structured targets to manipulate the electron properties and obtain a target design for producing high current, efficiently transported and collimated fast electron beams. Combining theoretical analyses, numerical simulations and experiments, we are going to further study the kinetics in the interactions of intense laser and nano-structured targets, and then optimize the theoretical scheme to match experimental conditions, thus effectively regulating and controlling the characteristics of high current fast electrons.