多层膜极化镜是构成中子极化装置的核心元件,为了实现中子多层膜极化镜的研制,开展了中子多层膜极化镜的设计方法研究。首先阐述了中子多层膜极化镜的原理,基于不同材料的光学特性,提出了中子多层膜极化镜的材料选择方法;其次,介绍了Mezei设计方法,并针对Mezei设计方法的缺陷,分别通过引入新的膜层结构(亚帽层法)和新的设计参数(乘系数法),对原设计方法进行了改进,实现了上旋中子反射率和极化率较为理想的m=2的中子极化超镜的设计。计算结果表明,两种方法均可以提升上旋中子反射率,但都会增加极化镜的膜层数,其中帽层法增加的膜层数相对较少。

Neutron polarizing supermirror (NPS) is a primary optical device for polarizing neutrons. In this paper, an optimized design method of NPS based on the famous Mezei design method, which has been widely applied in the design of neutron supermirrors is presented. Firstly,this paper introduces the principle of NPS, bringing up a method to choosing the material of layers in the NPS. Secondly, the Mezei method, which was brought up by Mezei in 1976 is introduced. Thirdly, two optimizing methods are presented for overcoming the shortages of Mezei method. Finally, the FeCo-Si neutron polarizing supermirrors are designed based on the optimized method for good reflectivity and polarization. The calculation results show that both methods can improve the reflectivity of the spin-up neutrons and the polarization.