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A focusing‐geometry small‐angle neutron scattering instrument with a magnetic neutron lens
Author(s) -
Oku Takayuki,
Iwase Hiroki,
Shinohara Takenao,
Yamada Satoru,
Hirota Katsuya,
Koizumi Satoshi,
Suzuki Junichi,
Hashimoto Takeji,
Shimizu Hirohiko M.
Publication year - 2007
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/s0021889807003822
Subject(s) - physics , neutron , neutron scattering , optics , small angle neutron scattering , magnetic lens , neutron radiation , neutron time of flight scattering , scattering , biological small angle scattering , nuclear physics , electron
We have constructed a focusing‐geometry small‐angle neutron scattering (FSANS) instrument, SANS‐J‐II, with two kinds of neutron focusing device: a series of compound refractive lenses made of MgF 2 and a magnetic neutron lens based on an extended Halbach‐type sextupole magnet. In this study, we investigated the performance of the FSANS instrument with the magnetic neutron lens. The intensity distribution of a direct neutron beam focused on the detector plane by the magnetic neutron lens had a ratio of the peak height to the background level of for a polarized neutron beam with a polarization degree of . It is found that a minimum value of the measurable range [where is the modulus of the scattering vector and is defined as , where is the scattering angle and is the neutron wavelength], , of Å −1 can be achieved by the FSANS instrument with the magnetic neutron lens using neutrons with Å and for the full width at half maximum.