高Z泡沫材料对激光X光转换效率增强效应研究

The X-ray emissions produced by laser plasma interaction play important roles in many fields including the studies of inertial confinement fusion and astrophysics. The enhancement of X-ray conversion efficiency has received considerable attention. In this research the low density high-Z foam is planning to be used as target material to enhance the X-ray conversion efficiencies. The theoretical simulations are going to be performed to investigate the laser plasma interaction mechanism, and then carry out the laser irradiated experiments in Shenguang high power laser facilities. The X-ray conversion efficiencies under different experimental conditions are obtained with the absolute measurements of radiation flux. In addition, the scattered light, plasma movement, X-ray spectrum distribution are measured to investigate the laser absorption, plasma kinetic energy, spectral property. This work could help understanding the X-ray generation mechanisms with low density high-Z material, and do strong contributions to the many research areas, including the inertial confinement fusion, astrophysics and other areas.

激光与物质相互作用产生的强X光辐射在惯性约束聚变、天体物理等众多学科领域有着十分重要的应用价值，提高激光X光转换效率，增强X光辐射，一直以来引起广泛关注。本项目拟采用低密度高Z泡沫作为靶材料，理论探索激光与高Z泡沫相互作用过程，分析其X光辐射增强效应细致物理机制，并在神光激光装置上开展实验研究，通过对辐射能流的定量测量，获得转换效率与激光条件、泡沫密度及厚度的物理规律，验证高Z泡沫材料对提高ns量级、几eV到几KeV能区X光辐射强度的增强效应；通过对散射光、等离子体运动、光谱分布等的定量测量，实验研究激光吸收特性、等离子体动能、光谱特性等与实验条件的物理规律，分析激光高Z泡沫相互作用的细致物理过程。该项目的研究不仅能够加深对于低密度高Z材料中激光等离子体相互作用的理解，而且在惯性约束聚变、天体物理等学科研究中具有重要的应用价值。

激光与物质相互作用产生的强X 光辐射在惯性约束聚变、天体物理等众多学科领域有着十分重要的应用价值，提高激光X 光转换效率，增强X 光辐射，一直以来引起广泛关注。本项目采用低密度高Z 泡沫作为靶材料，理论上探索了激光与高Z 泡沫相互作用过程，分析了其X 光辐射增强效应细致物理机制，并在神光激光装置上开展了实验研究，通过对辐射能流的定量测量，获得转换效率与激光条件、泡沫密度及厚度的物理规律，验证了高Z 泡沫材料对提高ns 量级、几eV 到几KeV 能区X 光辐射强度的增强效应；通过对散射光、等离子体运动、光谱分布等的定量测量，实验研究了激光吸收特性、等离子体动能、光谱特性等与实验条件的物理规律，分析了激光高Z 泡沫相互作用的细致物理过程。该项目的研究不仅能够加深对于低密度高Z 材料中激光等离子体相互作用的理解，而且在惯性约束聚变、天体物理等学科研究中具有重要的应用价值。