中子反射谱仪的闸门与直导管组合设计  

Combinatorial Design of Shutter and Straight Guide for Neutron Reflectomrter

作　　者：李新喜[1] 王燕[1] 黄朝强[1] 

机构地区：[1]中国工程物理研究院核物理与化学研究所,绵阳621900

出　　处：《核电子学与探测技术》2010年第1期55-58,共4页Nuclear Electronics & Detection Technology

基　　金：中国工程物理研究院科学技术发展基金(批准号:2007B02002)资助课题

摘　　要：为减少中子注量的损失,中子反射谱仪的设计通常需要采用中子导管来传输,最前端为中子束流闸门。论文采用Mcstas模拟计算软件,分别针对闸门通道内表面是否为吸收材料,采用多种组合设计模型进行了模拟计算。结果表明:闸门内表面选用超镜材料对闸门与直导管的组合传输性能有较大的提高,并且发散度增大不明显,这对于分辨率要求不是特别高,位于中子反射谱仪最前端的部件设计是非常有利的。经过多组比较分析,针对水平发散度要求较高的水平散射几何中子反射谱仪的前端组合设计,闸门内表面最好选择因子m=1.5或m=2的超镜,而不是吸收材料。计算给出了不同组合的模拟结果,结果可为相关中子反射谱仪闸门与前端直导管的组合设计提供理论参考。In order to reduce the loss of neutron flux, neutron reflectometer design usually use the neutron guide to transport neutron beam, forepart of the neutron reflectometer is the shutter. Simulation is done for the neutron absorbed material and different supermirror index of inner surface of the channel design model by Mcstas codes. The results shows that the inner surface of shutter use the supermirror can enhance the intensity of the exit of the focus neutron guide, and the divergence of the exit of focus neutron guide increase not much. It is very important for the forepart design of neutron reflectometer which is not require high resolution. After analysis of the different group design. For the forepart design of the horirental scattering geometry reflectometer which no high requiring of horizontal divergence, the inner surface supermirror index of the shutter should be selected m = 1.5 or m = 2. Calculation gives out combination results, The different simulation results can be the theoretical referenee for the forepart design of neutron reflectometer.

关 键 词：闸门 中子直导管 组合设计 模拟计算 

分 类 号：TL817.9[核科学技术—核技术及应用]