From x-ray telescopes to neutron scattering: Using axisymmetric mirrors to focus a neutron beam
Author(s)Khaykovich, Boris; Gubarev, M. V.; Bagdasarova, Yelena S.; Ramsey, B. D.; Moncton, David E.
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We demonstrate neutron beam focusing by axisymmetric mirror systems based on a pair of mirrors consisting of a confocal ellipsoid and hyperboloid. Such a system, known as a Wolter mirror configuration, is commonly used in x-ray telescopes. The axisymmetric Wolter geometry allows nesting of several mirror pairs to increase collection efficiency. We have implemented a system containing four nested Ni mirror pairs, which was tested by focusing a polychromatic neutron beam at the MIT Reactor. In addition, we have carried out extensive ray-tracing simulations of the mirrors and their performance in different situations. The major advantages of the Wolter mirrors are nesting for large angular collection, and aberration-free performance. We discuss how these advantages can be utilized to benefit various neutron scattering methods, such as imaging, SANS, and time-of-flight spectroscopy.
DepartmentMassachusetts Institute of Technology. Department of Physics; MIT Nuclear Reactor Laboratory
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Khaykovich, B. et al. “From x-ray telescopes to neutron scattering: Using axisymmetric mirrors to focus a neutron beam.” Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 631.1 (2011): 98-104.
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