完美晶体双聚焦单色器与镶嵌晶体垂直聚焦单色器的模拟研究  

Simulation on monochromators of double focusing perfect crystal and vertical focusing mosaic crystal

作　　者：陈彦舟[1] 孙光爱[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,绵阳621900

出　　处：《核技术》2010年第7期522-525,共4页Nuclear Techniques

摘　　要：为满足中子衍射应力分析谱仪高注量率和高分辨率的要求,采用蒙特卡罗模拟程序SIMRES对其单色器进行了模拟研究。分别从单色器衍射几何(对称、非对称和完全非对称)、聚焦条件(垂直和水平聚焦曲率)和晶体类型(完美晶体和镶嵌晶体)三个方面,以品质因子为量化指标,系统比较了与谱仪的注量率和分辨率的影响关系。研究结果表明:采用对称几何及完美晶体双聚焦方式可以获得最佳的谱仪性能。In order to satisfy both high flux and high resolution of residual stress neutron diffractometer, the monochromator was simulated using Monte Carlo simulation code SIMRES. A series of factors, including the diffraction geometries （symmetric diffraction, asymmetric diffraction and fully asymmetric diffraction）, focusing conditions （vertical and horizontal focusing curvatures） and crystal types （perfect crystal and mosaic crystal）, were considered in the simulation to study, taking the figure of merit （FoM） as a comparison measure, the influences of flux on resolution of the diffractometer. The results show that use of symmetric diffraction and perfect crystal double focusing could achieve the best performance.

关 键 词：蒙特卡罗模拟 中子衍射应力分析谱仪 聚焦单色器 SIMRES 

分 类 号：O571.56[理学—粒子物理与原子核物理]