用FLUKA程序模拟增程中子多球谱仪的响应函数
Simulation of the response functions of Extended Range Neutron Multisphere Spectrometer using FLUKA program
摘要：
本文利用FLUKA程序模拟了CSNS光谱仪大厅内的辐射场分布。结果表明，高能质子加速器的辐射场以中子辐射为主，中子辐射的能量范围很宽，约有11个数量级。其次，分别用FLUKA和MCNP程序对简化模型下的四个Bonner球的响应函数进行了模拟计算，得到了可接受的误差，验证了FLUKA程序在此应用中的可行性和相关计算方法的正确性。采用实际模型，利用FLUKA程序模拟计算了不同直径聚乙烯层的Bonner球探测器的能量响应函数，包括铅层探测器的能量响应函数。根据仿真结果，我们选择了11个检测器作为ERNMS的基本结构。
英文摘要：
In this paper, the distribution of radiation field in the CSNS spectrometer hall was simulated by FLUKA program. The results showed that the radiation field of high energy proton accelerator is dominated by neutron radiation, and the range of neutron energy is quite widely, including about eleven orders of magnitude. Nextly, work of simulation and calculation of the response functions of four Bonner spheres with simplified model is done by FLUKA and MCNP codes respectively, and the acceptable difference proved the feasibility of FLUKA program in this application and the correctness of the relevant calculation method. Through adopting the actual model, we simulate and calculate the energy response functions of Bonner sphere detectors with polyethylene layers of different diameters, including the detectors with lead layers by using FLUKA code. According to the simulation results, we select eleven detectors as the basic structure of ERNMS.
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