结合激光康普顿散射模拟程序4D-MCLCSS和Geant4软件包, 模拟上海激光电子γ源(SLEGS)的γ光产生及其对长寿命裂变产物126Sn的光核嬗变过程, 研究嬗变率与嬗变靶几何参数的依赖关系, 并初步诊断基于SLEGS 的光核嬗变产物分布, 获得126Sn嬗变靶的最佳靶厚和半径分别为16 cm和0.4 cm, 对应的嬗变率为1.89×106 /s。研究结果表明: 基于SLEGS的光核嬗变率比强激光驱动的轫致辐射法要高2倍, 而且升级潜力巨大。

By combining the simulation program 4D-MCLCSS of laser Compton scattering and the package of Geant4, the gamma rays generation of Shanghai laser-electron gamma source (SLEGS) and its impact on the photo-transmutation process of the long-lived fission products 126Sn was simulated. The dependency of transmutation ratio and the geometry parameters of transmutation target was researched, and the transmutation product distribution based on SLEGS was initially diagnosed. It is shown that the best target thickness and the best radius to obtain the transmutation target of 126Sn are respectively 16 cm and 0.4 cm, and the corresponding transmutation rate is 1.89×106/s. The research results show that the light photo-transmutation rate based on SLEGS is twice higher than the laser-driven bremsstrahlung, and its upgrade potential is huge.