Development of the very low energy neutron beam transportation and bending system

已经开发了几种中子镜来传输和弯曲极低能中子。1)研制了用于大照射场的抛光玻碳中子镜。2)研制了由两片硅片多层叠层构成的宽带单色仪。该堆栈将单个多层膜的中子反射波长从26-40 nm展宽到19-40 nm。3)研制出了用于中子镜的氢化金刚石-碳中子镜。它还有可能制作出可用于形状复杂的中子导管、中子弯曲器和聚焦装置的自由面形反射镜。4)尝试了极低能中子的新应用--极冷中子照相。水层厚度分辨率小于0.1 mm。VCN射线照片可以显示干燥过程中花内水分的变化。

Several kind of neutron mirrors have been developed to transport and bend very low energy neutrons. 1) Polished glassy carbon neutron mirrors for high irradiation field was developed. 2) Wide band monochromator consisting of a stack of multilayers on two Si wafers was developed. The neutron reflection wavelength was broadened to 19 - 40 nm by this stack from 26 - 40 nm of one multilayer. 3) Deuterated diamond-ike carbon as neutron mirrors was developed. It also has a possibility of making a free shape mirror to be useful for neutron guide tube with complicated shape, neutron bender and focusing devices. 4) Very cold neutron radiography as the new aplication of very low energy neutrons was tried. The resolution of water thickness is less than 0.1 mm. VCN radiography can show the change of water quantity in flowers during a drying procedure.