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Recent progress in the development of concave Fresnel lenses for neutrons
Author(s) -
Adachi T,
Ikeda K,
Oku T.,
Sakai K.,
Suzuki S.,
Suzuki J.,
Shimizu H.M.,
Littrell K.C.,
Loong C.K.,
Lin W.,
Guo J.,
Mitsuishi N.,
Morita S.,
Ohmori H.
Publication year - 2003
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889803003893
Subject(s) - optics , neutron , lens (geology) , fresnel lens , materials science , wavelength , fresnel number , focal length , diffraction , fresnel diffraction , physics , nuclear physics
The performance of a Fresnel‐type compound refractive lens for focusing cold neutrons was evaluated. The lens consists of 44 pieces of compound Fresnel‐type refractive lenses made of MgF 2 single crystals. The intensity profile of the diffracted neutrons measured over the wavelengths of 9–14 Å was compared with the results of numerical simulations. Good neutron transmission of 0.85 for 9 Å neutrons and a focal length of 3.4 m for 16 Å neutrons were achieved.