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对安装于中子应力谱仪上的准直器系统进行了模拟和计算。通过确定和优化各个准直器参数,分析了它们对谱仪性能指标的影响。模拟过程中主要采用了MCStas软件进行建模及优化计算工作。通过第一、第二准直器等主要部件的发散度参数α_1、α_2和长度的组合变化,发现了它们对谱仪整体的影响,计算了它们引起的分辨率改变,最终得到在α_1=α_2=30′时样品处水平方向中子注量率为2.3×10~6n·cm~(-2)·s~(-1),垂直方向为3.5×10~6n·cm~(-2)·s~(-1),并且当第一、第二准直器发散角α_1=α_2=10′时谱仪可以得到它的最好分辨率F_w=0.2°它所对应的应变误差值是应力谱仪测量的最小误差。
The collimator system installed on the neutron stress spectrometer was simulated and calculated. By determining and optimizing the parameters of each collimator, the influence of them on the performance of the spectrometer was analyzed. The simulation process mainly uses MCStas software to model and optimize the calculation work. Through the combined changes of the divergence parameters α_1, α_2 and length of the main components such as the first and the second collimators, they are found to affect the whole spectrometer and the resolution changes caused by them are calculated. Finally, = 30 ', the horizontal neutron fluence rate is 2.3 × 10 ~ 6n · cm ~ (-2) · s ~ (-1) and the vertical direction is 3.5 × 10 ~ 6n · cm ~ (-2) · s ~ (-1), and the spectrometer can get its best resolution F_w = 0.2 ° when the first and second collimator divergence angle α_1 = α_2 = 10 '. The corresponding strain error value is the stress spectrum The minimum error of the meter measurement.