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为使用FLUKA程序模拟设计中国散裂中子源(CSNS)的束流垃圾桶结构,先利用日本原子能研究所(JAERI)使用MCNPX程序对其3 GeV质子束流垃圾桶的辐射剂量计算结果,作了FLUKA与MCNPX的对比验证。结果表明,在30%误差范围内,FLUKA模拟结果与MCNPX的结果相符,束斑大小对辐射剂量无重要影响。随后采用梯形切片划分垃圾桶区域,用FLUKA模拟了CSNS上1.6GeV的束流垃圾桶结构。结果表明,用FLUKA程序并采用梯形切片,可方便地引入区域重要性方差减小技巧和改变垃圾桶材料厚度,从而优化束流垃圾桶结构。
In order to use the FLUKA program to simulate the design of the beam trash can of China’s spallation neutron source (CSNS), the calculation results of the radiation dose of its 3 GeV proton beam trash can by using the MCNPX program by JAERI FLUKA and MCNPX comparison verification. The results show that within 30% error range, the FLUKA simulation results are consistent with the results of MCNPX, and the beam spot size has no significant effect on the radiation dose. Trash area was then divided by trapezoidal slices, and the 1.6GeV beam trash can structure on the CSNS was simulated by FLUKA. The results show that using the FLUKA program with trapezoidal slices, the variance of regional importance can be easily introduced and the thickness of the trash can be changed to optimize the structure of the trash can.