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Proceedings Paper

Characterizing a neutron lens: study of capillary optics
Author(s): Huaiyu Heather Chen-Mayer; Robert Gregory Downing; David F. R. Mildner; V. A. Sharov
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Paper Abstract

A neutron lens constructed with glass capillary fibers has been used to focus neutron beams of various geometries and wavelengths. We give as an example measurements performed at an end position of a 58Ni-coated cold neutron guide, where the exiting neutron beam with a cross section of 30 mm in diameter from the guide is incident on the lens and is focused to a 1 mm diameter spot, with a gain of 3.6 in neutron flux density. We have evaluated various features of the focusing performance of the lens, as well as some neutron properties of individual capillary fibers. The average reflectivity of the inner wall of the fibers has been determined to be greater than 0.99. The results of this study will be used for the design and construction of future lenses for neutron absorption experiments such as depth profiling and prompt gamma activation analysis.

Paper Details

Date Published: 23 November 1992
PDF: 10 pages
Proc. SPIE 1738, Neutron Optical Devices and Applications, (23 November 1992); doi: 10.1117/12.130649
Show Author Affiliations
Huaiyu Heather Chen-Mayer, National Institute of Standards and Technology (United States)
Robert Gregory Downing, National Institute of Standards and Technology (United States)
David F. R. Mildner, National Institute of Standards and Technology (United States)
V. A. Sharov, X-ray Optical Systems, Inc. and I.V. Kurchatov Atomic Energy Insti (Russia)

Published in SPIE Proceedings Vol. 1738:
Neutron Optical Devices and Applications
Charles F. Majkrzak; James L. Wood, Editor(s)

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