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J. Imaging 2018, 4(3), 50; https://doi.org/10.3390/jimaging4030050

Demonstration of Focusing Wolter Mirrors for Neutron Phase and Magnetic Imaging

1
Physical Measurement Laboratory, NIST, Gaithersburg, MD 20899-8461, USA
2
National Heart Lung Blood Institute, National Institute of Health, Bethesda, MD 20892, USA
3
Key Laboratory of Particle & Radiation Imaging, Tsinghua University, Ministry of Education, Beijing 100084, China
4
NIST Center for Neutron Research, NIST, Gaithersburg, MD 20899, USA
5
Department of Materials Science Engineering, University of Maryland, College Park, MD 20742, USA
6
Nuclear Reactor Laboratory, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
*
Author to whom correspondence should be addressed.
Received: 1 November 2017 / Revised: 1 March 2018 / Accepted: 2 March 2018 / Published: 6 March 2018
(This article belongs to the Special Issue Neutron Imaging)
Full-Text   |   PDF [3096 KB, uploaded 6 March 2018]   |  

Abstract

Image-forming focusing mirrors were employed to demonstrate their applicability to two different modalities of neutron imaging, phase imaging with a far-field interferometer, and magnetic-field imaging through the manipulation of the neutron beam polarization. For the magnetic imaging, the rotation of the neutron polarization in the magnetic field was measured by placing a solenoid at the focus of the mirrors. The beam was polarized upstream of the solenoid, while the spin analyzer was situated between the solenoid and the mirrors. Such a polarized neutron microscope provides a path toward considerably improved spatial resolution in neutron imaging of magnetic materials. For the phase imaging, we show that the focusing mirrors preserve the beam coherence and the path-length differences that give rise to the far-field moiré pattern. We demonstrated that the visibility of the moiré pattern is modified by small angle scattering from a highly porous foam. This experiment demonstrates the feasibility of using Wolter optics to significantly improve the spatial resolution of the far-field interferometer. View Full-Text
Keywords: neutron imaging; Wolter optics; polarized neutron imaging; far-field interferometer neutron imaging; Wolter optics; polarized neutron imaging; far-field interferometer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Hussey, D.S.; Wen, H.; Wu, H.; Gentile, T.R.; Chen, W.; Jacobson, D.L.; LaManna, J.M.; Khaykovich, B. Demonstration of Focusing Wolter Mirrors for Neutron Phase and Magnetic Imaging. J. Imaging 2018, 4, 50.

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