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应用MCNPX程序,构建质子束轰击球床钨颗粒散裂靶的物理模型,模拟散裂靶泄露中子产额、能谱、通量轴向分布以及散裂靶沉积能分布。针对不同钨颗粒直径和体积填充率,研究了不同钨颗粒直径下体积填充率变化对球床散裂靶中子学特性的影响。模拟结果表明,钨颗粒体积填充率增加,散裂靶的最大沉积能密度减小。在1～20 mm的范围内,钨颗粒的直径越小,散裂靶泄漏中子产额越大,散裂靶泄漏中子产额随钨颗粒体积填充率变化的波动越小,有利于维持CIADS系统反应堆功率稳定。
The MCNPX program was used to construct the physical model of proton beam bombardment ball spallation tungsten spallation target, to simulate the spurious neutron yield, energy spectrum, axial distribution of flux and the deposition energy distribution of spallation target. According to the different diameter and volume fraction of tungsten particles, the influence of different volume fraction of tungsten particles on the neutron properties of spalling target was studied. The simulation results show that the volumetric filling rate of tungsten particles increases and the maximum deposition energy density of the spallation target decreases. In the range of 1 ~ 20 mm, the smaller the diameter of the tungsten particles, the greater the leakage neutron yield from the spallation target. The smaller the variation of leakage neutron yield with the volumetric filling rate of tungsten particles, CIADS system reactor power stability.