高能质子在散裂靶中的能量沉积计算与实验验证

Calculation and verification for energetic proton energy deposition in spallation target

高能质子在散裂靶中的能量沉积是散裂靶中子学研究的重要内容之一,准确掌握高能质子在散裂靶中引起的能量沉积分布与瞬态变化是开展散裂靶热工流体设计的重要前提.本文采用MCNPX,PHITS与FLUKA三种蒙特卡罗模拟程序,计算并比较了高能质子入射重金属铅靶、钨靶的能量沉积分布及不同粒子对总能量沉积的占比贡献;针对高能质子入射金属钨靶的能量沉积实验数据空白,采用热释光探测器阵列测量了250 MeV质子束入射厚钨靶的能量沉积分布,实验结果表明蒙特卡罗模拟程序在散裂靶中能量沉积的计算结果具有较高的可靠性.

Energy deposition in spallation target induced by energetic protons is the foundation and the premise of the spallation target research.In this paper,several intra-nuclear cascade models including BERTINI,ISABEL,CEM2K and INCL4 contained in MCNPX package,together with FLUKA and PHITS Monte Carlo codes are used to calculate the energy deposition in lead(Pb)and tungsten(W)spallation target impinged by 800,1000,and 1200 MeV protons.The contributions of different particles to the total energy deposition in the Pb target are obtained and compared with each other as well.The energy deposition distribution caused by 250 MeV protons in the W target is measured with thermoluminescence detectors(TLDs).The results indicate that the calculations from the MCNPX accord with experimental data,verifying that the Monte Carlo code has a high reliability for energy deposition simulation.