Hosobata T, Yamada NL, Hino M, Yoshinaga H, Nemoto F, Hori K, Kawai T, Yamagata Y, Takeda M, Takeda S. Elliptic neutron-focusing supermirror for illuminating small samples in neutron reflectometry.
OPTICS EXPRESS 2019;
27:26807-26820. [PMID:
31674555 DOI:
10.1364/oe.27.026807]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 08/11/2019] [Indexed: 06/10/2023]
Abstract
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.
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