Hosobata Takuya, Yamada Norifumi L, Hino Masahiro, Yoshinaga Hisao, Nemoto Fumiya, Hori Koichiro, Kawai Toshihide, Yamagata Yutaka, Takeda Masahiro, Takeda Shin
Opt Express. 2019 Sep 16;27(19):26807-26820. doi: 10.1364/OE.27.026807.
This paper details the development of a precise assembly of two supermirrors for neutron-focusing, designed for installation in neutron reflectometer SOFIA at BL16 in J-PARC MLF to intensify the illumination for small samples. The supermirrors are sputtered on two metal substrates, whose surfaces are coated with amorphous Ni-P plating, and are figured by diamond cutting and polished to subnanometer roughness. Special care is taken while polishing the substrates to reduce waviness and surface roughness for achieving a sharp focusing spot and uniform neutron reflectivity. The supermirror could converge the neutrons into a focal spot with a width of 0.13 mm in the full width at half maximum.
