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23 November 1992 Characterizing a neutron lens: study of capillary optics
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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.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Huaiyu Heather Chen-Mayer, Robert Gregory Downing, David F. R. Mildner, and V. A. Sharov "Characterizing a neutron lens: study of capillary optics", Proc. SPIE 1738, Neutron Optical Devices and Applications, (23 November 1992); https://doi.org/10.1117/12.130649
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