摘要
用蒙特卡罗中子射线追踪程序McStas对中子衍射应力谱仪单色器部件进行模拟优化:以Cu(220)比较了单色器起飞角和准直系统对样品处中子注量率、分辨率的影响;计算得到给定条件下单色器最佳单晶条数和镶嵌度;单晶条倾角精度建议好于0.1°;计算了Cu(222)、(220)和(002)在不同起飞角情况下获得的中子注量率;相同条件下,Cu和Ge常用晶体单色器中以Cu(220)获得的中子注量率最大,而Cu(222)获得的波长分辨率最佳。
The crystal rnonochromator of neutron diffractometer for stress measurement was optimized u- sing Monte Carlo neutron ray-tracing program McStas. Regarding Cu （220）, flux and resolution of neutron beam at gauge volume were calculated for different take-off angle and horizontal divergence of first collimator. The mosaicity and the number of crystal stripes were optimized under given conditions. A suggestion value obtained for the precision of crystal stripes＇ tilting angle is 0. 1°. Neutron fluxes at sam- ple were calculated for Cu（222） , （220） and （002） at different take-off angles. With the same parameters, among general Cu and Ge monochromators, Cu（220） results in maximal flux while Cu（222） optimal resolution.
出处
《核电子学与探测技术》
CAS
CSCD
北大核心
2010年第3期374-379,共6页
Nuclear Electronics & Detection Technology
关键词
垂直聚焦单色器
蒙特卡罗模拟
中子应力谱仪
McStas
vertically focusing monochromator, monte carlo simulation, neuron stress diffractiometer,McStas
