【摘要】 中国散裂中子源(China Spallation Neutron Source,CSNS)是一台基于散裂反应的大型的多学科研究平台。2018年8月竣工并正式运行。实验缪子源(Experimental Muon Source,EMuS)是CSNS未来规划建设的重要研究平台之一。根据多步发展的规划,简化方案(Baby Scheme)的实验缪子源将优先考虑建设,设计运行功率5 kW。利用蒙特卡罗粒子输运程序FLUKA模拟1.6 GeV高能质子束轰击碳靶过程,研究了废质子束流处理、靶上能量沉积、缪子束的产生和本底及整个靶区的辐射情况和屏蔽方案等。确定了靶室材料为铝合金材料,优化的屏蔽体结构成功将剩余剂量控制在2.5μSv·h-1以下,为周边维护人员提供低放射环境。更多还原

【Abstract】 [Background] China Spallation Neutron Source(CSNS) based on the spallation reaction is a large multiprinciple research platform, which has been completed and began commissioning since August 2018. Experimental muon source(EMuS) is one of important research platforms constructed at CSNS in the future. [Purpose] This study aims to design a simplified EMuS according to the multiple-stage construction plan. [Methods] First of all, the processes of a high energy proton beam bombarding on a carbon target were simulated by employing FLUKA code based on Monte Carlo method. Then, the disposition of abandoned proton beam, energy deposition in target, muon production were analysed in details, background and whole target radiation and shielding scheme were investigated by simulation. [Result & Conclusion] The aluminum alloy is determined to be target chamber material according to the simulation. The residual radiation dose can be controlled to below 2.5 μSv·h-1 with optimal geometry structure,providing a low-radiation environment for the maintenance.更多还原