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阐述塑料闪烁光纤对14.1 MeV中子的响应机理;建立基于Geant4与MCNPX的蒙特卡洛模拟程序,通过添加发光计算实现MCNPX对中子光响应的计算,并对Geant4进行校验;对14.1 MeV中子在闪烁体内产生反冲质子及发光响应进行了模拟;发现并研究了塑料闪烁内由14.1 MeV中子产生的反冲质子半高宽,与使用阵列型探测器获得的半高宽的差异;给出使用倾斜狭缝源获得的调制传递函数,结合瑞丽判据获得精确光纤阵列分辨率的方法;对正方形光纤阵列与圆柱光纤(四边形排布与六边形排布)阵列空间分辨率随光纤尺寸变化进行模拟与分析.提出的方法与模拟结果可以用于ICF实验中光纤阵列的优化设计.
The response mechanism of plastic scintillation fiber to 14.1 MeV neutrons was described. The Monte Carlo simulation program based on Geant4 and MCNPX was established. The calculation of neutron light response of MCNPX was performed by adding luminescence and the calibration of Geant4 was performed. For 14.1 MeV The generation of recoil protons in the scintillator and the luminescence response were simulated. The half height width of the recoil proton produced by 14.1 MeV neutron in plastic scintillation was found and studied, which was different from the half-height width obtained by the array detector. The method of obtaining the modulation transfer function by using sloping slit source and combining the Rayleigh criterion with the resolution of the optical fiber array is given. The spatial resolution of the array of square fiber array and cylindrical fiber (quadrilateral arrangement and hexagonal arrangement) Dimensional simulation and analysis.The proposed method and simulation results can be used to optimize the optical fiber array in ICF experiment.