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CSR(cooling storage ring)按计划将于2005年底建成调束,届时从~(12)C到~(238)U的重离子将可以分别被加速到900和400MeV的能量。HIRFL(兰州重离子加速器Heavy Ion Research Facility in Lanzhou)将用作CSR的注入器。为了CSR的屏蔽设计,本文利用现有的实验数据计算了由于束流损失产生的中子及其能谱、角分布,同时也估算了屏蔽体外表面的中子剂量、环境中子剂量及天空返照中子剂量。在源项计算中使用了400MeV/u~(12)C+Cu反应的中子产额、能谱、角分布的实验数据。计算表明,CSR对环境剂量影响最大的是天空返照中子。
The CSR (cooling storage ring) is scheduled to be completed by the end of 2005. The heavy ions from ~ (12) C to ~ (238) U will be accelerated to energies of 900 and 400 MeV, respectively. HIRFL (Heavy Ion Research Facility in Lanzhou) will be used as a CSR injector. In order to design a CSR shield, we calculate the neutron, its energy spectrum and the angular distribution due to the beam loss by using the existing experimental data, and also estimate the neutron dose, the neutron dose and the sky reverberation on the outer surface of the shield Neutron dose. In the calculation of source terms, experimental data of neutron yield, energy spectrum and angle distribution of 400MeV / u ~ (12) C + Cu reaction were used. Calculations show that the greatest impact of CSR on the environmental dose is sky back to neutron.