| 基于Mezei算法的FeCo-Si中子多层膜极化镜优化设计 |
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| 引用本文： | 王俊杰,张众,王占山. 基于Mezei算法的FeCo-Si中子多层膜极化镜优化设计[J]. 光学仪器, 2015, 37(5): 461-465 |
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| 作者姓名： | 王俊杰 张众 王占山 |
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| 作者单位： | 同济大学物理科学与工程学院先进微结构材料教育部重点实验室, 上海 200092,同济大学物理科学与工程学院先进微结构材料教育部重点实验室, 上海 200092,同济大学物理科学与工程学院先进微结构材料教育部重点实验室, 上海 200092 |
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| 基金项目： | 国家自然科学基金资助项目(11075117) |
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| 摘 要： | 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。
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| 关 键 词： | 中子极化超镜 多层膜 反射率 极化率 |
| 收稿时间： | 2015-02-11 |
Optimized design of FeCo-Si neutron polarizing supermirrors based on Mezei method |
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| WANG Junjie,ZHANG Zhong and WANG Zhanshan. Optimized design of FeCo-Si neutron polarizing supermirrors based on Mezei method[J]. Optical Instruments, 2015, 37(5): 461-465 |
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| Authors: | WANG Junjie ZHANG Zhong WANG Zhanshan |
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| Affiliation: | MOE Key Laboratory of Advanced Micro-structured Materials, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China,MOE Key Laboratory of Advanced Micro-structured Materials, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China and MOE Key Laboratory of Advanced Micro-structured Materials, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China |
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| Abstract: | 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. |
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| Keywords: | neutron polarizing supermirror multilayer reflectivity polarization |
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