蒙特卡罗方法在Soller中子狭缝准直器优化设计中的应用

Monte-Carlo Simulation Optimization for Neutron Soller Slit Collimator

Soller型中子狭缝准直器是中子散射谱仪部件之一,用来对中子束流进行准直。准直器的设计不仅需要对吸收材料进行选择,吸收材料的厚度选择也很重要。准直器的透射率和空间的限制对准直器的长度提出要求。应用以蒙特卡罗方法为基础的模拟计算对准直器进行优化设计是一种新的尝试。采用MCNP程序对准直器的长度和吸收片厚度进行了模拟优化设计,并对计算结果进行了评定。

As one component of neutron diffraction spectrometer, Soller neutron slit collimator is applied to collimation of neutron beam. When a collimator is designed, it is needed to choose not only kind and thickness of absorbing material, but also length of collimator for high transmission and small space. Collimator optimization was tried with Monte-Carlo simulation. Optimization was carried out for absorber thickness and collimator length, and the calculating result was evaluated.