A study of beryllium moderator thickness for a fission chamber with fast neutron measurements  

作　　者：Wen-Di Wang Hong-Rui Cao Jing Cao Guo-Liang Yuan Ze-Jie Yin 

机构地区：[1]State Key Laboratory of Particle Detection and Electronics,University of Science and Technology of China,Hefei 230026, China [2]Department of Modern Physics, University of Science andTechnology of China, Hefei 230026, China [3]Southwestern Institute of Physics, Chengdu 610041, China

出　　处：《Nuclear Science and Techniques》2017年第9期51-56,共6页核技术（英文）

基　　金：supported by the National Natural Science Foundation of China(Nos.10976028 and 11375195);the National Magnetic Confinement Fusion Energy Development Research(No.2013GB104003)

摘　　要：The detection efficiency of the fission chamber(FC) is very important for studying the neutron flux measurement(NFM) system in ITER. In this article, we mainly focus our attention on the influence of the moderator. With the Monte Carlo particle transport simulation tool named Geant4, we make a simulation of FC detection efficiency with different levels of thickness of a beryllium moderator.Two manufactured FCs for ITER-NFM systems are then used to test the parameters and performance. The test results agree well with our simulation.The detection efficiency of the fission chamber （FC） is very important for studying the neutron flux mea- surement （NFM） system in ITER. In this article, we mainly focus our attention on the influence of the moderator. With the Monte Carlo particle transport simulation tool named Geant4, we make a simulation of FC detection efficiency with different levels of thickness of a beryllium moderator. Two manufactured FCs for ITER-NFM systems are then used to test the parameters and performance. The test results agree well with our simulation.

关 键 词：中子测量 慢化剂 裂变室 厚度 GEANT4 铍 测量系统 模拟工具 

分 类 号：TL61[核科学技术—核技术及应用]