Selection diagram of design algorithms for neutron-focusing supermirrors

Wen-Bo Mo; Hua-Rui Wu; Xue-Wu Wang

doi:10.1007/s41365-022-01080-4

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Selection diagram of design algorithms for neutron-focusing supermirrors

ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS | Updated：2022-09-26

- Selection diagram of design algorithms for neutron-focusing supermirrors
- Nuclear Science and Techniques Vol. 33, Issue 8, Article number: 104(2022)
- Affiliations：
  
  1.Department of Engineering Physics, Tsinghua University, Beijing 100084, China
  2.Key Laboratory of Particle Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, China
- Author bio：
  
  nghuaruiwu@mail.tsinghua.edu.cn
  wangxuewu@tsinghua.edu.cn
- Funds：
- DOI：10.1007/s41365-022-01080-4
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Wen-Bo Mo, Hua-Rui Wu, Xue-Wu Wang. Selection diagram of design algorithms for neutron-focusing supermirrors. [J]. Nuclear Science and Techniques 33(8):104(2022)
DOI：

Wen-Bo Mo, Hua-Rui Wu, Xue-Wu Wang. Selection diagram of design algorithms for neutron-focusing supermirrors. [J]. Nuclear Science and Techniques 33(8):104(2022) DOI： 10.1007/s41365-022-01080-4.

摘要

Abstract

The neutron supermirror is an important neutron optical device that can significantly improve the efficiency of neutron transport in neutron guides and has been widely used in research neutron sources. Three types of algorithms, including approximately 10 algorithms, have been developed for designing high-efficiency supermirror structures. In addition to its applications in neutron guides, in recent years the use of neutron supermirrors in neutron-focusing mirrors has been proposed to advance the development of neutron scattering and neutron imaging instruments, especially those at compact neutron sources. In this new application scenario, the performance of supermirrors strongly affects the instrument performance; therefore, a careful evaluation of the design algorithms is needed. In this study, we examine two issues: the effect of nonuniform film thickness distribution on a curved substrate and the effect of the specific neutron intensity distribution on the performance of neutron supermirrors designed using existing algorithms. The effect of film thickness nonuniformity is found to be relatively insignificant, whereas the effect of the neutron intensity distribution over ,Q, (where ,Q, is the magnitude of the scattering vector of incident neutrons) is considerable. Selection diagrams that show the best design algorithm under different conditions are obtained from these results. When the intensity distribution is not considered, empirical algorithms can obtain the highest average reflectivity, whereas discrete algorithms perform best when the intensity distribution is taken into account. The reasons for the differences in performance between algorithms are also discussed. These findings provide a reference for selecting design algorithms for supermirrors for use in neutron optical devices with unique geometries and can be very helpful for improving the performance of focusing supermirror-based instruments.

关键词

Keywords

Neutron-focusing supermirrorDesign algorithmThickness nonuniformityIntensity distribution over QSelection diagram

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