Physics – Instrumentation and Detectors
Scientific paper
2012-04-13
Nucl. Instr. and Meth. A 631, 98 (2011)
Physics
Instrumentation and Detectors
Scientific paper
10.1016/j.nima.2010.11.110
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.
Bagdasarova Y.
Gubarev Mikhail V.
Khaykovich Boris
Moncton D. E.
Ramsey Brian D.
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