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The characterization of a polycapillary neutron lens
Author(s) -
Mildner D. F. R.,
Chen H.
Publication year - 1994
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/s0021889894005406
Subject(s) - optics , lens (geology) , neutron , focus (optics) , neutron radiation , beam (structure) , characterization (materials science) , materials science , intensity (physics) , beam divergence , absorption (acoustics) , wavelength , physics , beam diameter , nuclear physics , laser beams , laser
Materials‐analysis measurements that employ neutron‐absorption techniques may benefit from cold neutrons that may be focused using a lens consisting of polycapillary fibers. An expression is derived for the intensity gain and the size of the beam along the beam path, including that at the focus, and a criterion is developed for the depth of focus. The gain in intensity at the focus depends not only on the design parameters of the lens but also on the divergence and wavelength of the incident beam. This analysis is applied to the two neutron lenses that have previously been tested.