典型文献
Selection diagram of design algorithms for neutron-focusing supermirrors
文献摘要：
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 algo-rithms,including approximately ten 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 devel-opment of neutron scattering and neutron imaging instru-ments,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 nonuni-formity 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.
文献关键词：
中图分类号：
作者姓名：
Wen-Bo Mo;Hua-Rui Wu;Xue-Wu Wang
作者机构：
Department of Engineering Physics,Tsinghua University,Beijing 100084,China;Key Laboratory of Particle Radiation Imaging(Tsinghua University),Ministry of Education,Beijing 100084,China
文献出处：
引用格式：
[1]Wen-Bo Mo;Hua-Rui Wu;Xue-Wu Wang-.Selection diagram of design algorithms for neutron-focusing supermirrors)[J].核技术（英文版）,2022(08):106-117
A类：
supermirrors,supermirror,nonuni
B类：
Selection,algorithms,focusing,important,optical,that,significantly,improve,efficiency,transport,guides,has,been,widely,used,research,sources,Three,types,including,approximately,have,developed,designing,structures,In,addition,its,applications,recent,years,proposed,advance,opment,scattering,imaging,especially,those,compact,this,new,scenario,performance,strongly,affects,therefore,careful,evaluation,needed,study,examine,two,issues,effect,nonuniform,film,thickness,distribution,curved,substrate,specific,intensity,designed,existing,formity,found,relatively,insignificant,whereas,over,magnitude,vector,incident,neutrons,considerable,diagrams,show,best,under,different,conditions,obtained,from,these,results,When,not,considered,empirical,highest,average,reflectivity,discrete,when,taken,into,account,reasons,differences,between,also,discussed,These,findings,provide,reference,selecting,devices,unique,geometries,very,helpful,improving,instruments
AB值：
0.432253
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