中子反射谱仪的闸门与会聚导管组合设计  

Optimized combination of shutters and focus neutron guides for neutron reflectometers

作　　者：李新喜[1] 王燕[1] 黄朝强[1] 陈波[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,四川绵阳621900

出　　处：《光学精密工程》2009年第12期2983-2989,共7页Optics and Precision Engineering

基　　金：中国工程物理研究院科学技术发展基金资助项目(No.2007B02002)

摘　　要：为提高水平散射几何中子反射谱仪的前端束流特性,针对前端闸门与会聚中子导管的组合设计进行了优化计算。根据闸门通道截面、会聚导管入、出口截面及相应内表面超镜因子不同分成多组,采用数值方法对多个组合设计进行优化计算。结合水平散射几何中子反射谱仪的客观需求进行比较分析,选取比较理想的组合。计算结果表明:会聚导管的最佳组合是采用水平面会聚,垂直面不会聚,而闸门内表面超镜因子选为2,会聚导管水平面超镜因子为3,垂直面超镜因子为2。通过多组比较分析,获得了水平散射几何中子反射谱仪的前端闸门与会聚导管的相关物理参数的优化组合,为谱仪的概念设计奠定了基础。To improve the performance of the front beam of a neutron scattering reflectometer with the horizontal geometry , the optimized combination of a beam shutter and a focus neutron guide is obtained by a numercal calculation method. According to the channel sections of the shulter and the entrance and exit of the neutron guide, and their supermirror indexes, the combination design model is divided into different groups. Based on the requirements of the neutron scattering reflectometer with the horizontal geometry,the optimized combination design model is chosen from the groups by a numerical calculation method. The result shows that the optimized design of focusing neutron guide is that one which can only focus on the horizontal walls of the guide and its supermirror indexes are 2,3, 2 for the shutter, and horizontal and vertical walls, respectively. The optimal parameter combinations of the shutter and the focus guide are selected after analysis of many groups of combinations, which lay a theoretical foundation for the conceptual design of neutron reflectometers.

关 键 词：中子反射谱仪 闸门 会聚导管 超镜因子 组合优化 

分 类 号：TL817.9[核科学技术—核技术及应用]