Open AccessElliptic neutron-focusing supermirror for illuminating small samples in neutron reflectometry
Author(s) -
Takuya Hosobata,
Norifumi L. Yamada,
Masahiro Hino,
Hisao Yoshinaga,
Fumiya Nemoto,
Koichiro Hori,
Takeshi Kawai,
Yutaka Yamagata,
Masahiro Takeda,
Shin Takeda
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.026807
Subject(s) - optics , polishing , neutron reflectometry , neutron , reflectometry , materials science , waviness , neutron imaging , surface finish , surface roughness , diamond , small angle neutron scattering , neutron scattering , physics , scattering , nuclear physics , composite material , time domain , computer science , computer vision
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.