Demonstration of Focusing Wolter Mirrors for Neutron Phase and Magnetic Imaging
by
Daniel S. Hussey 1,*, Han Wen 2, Huarui Wu 3
, Thomas R. Gentile 1, Wangchun Chen 4,5, David L. Jacobson 1, Jacob M. LaManna 1 and Boris Khaykovich 6
, Thomas R. Gentile 1, Wangchun Chen 4,5, David L. Jacobson 1, Jacob M. LaManna 1 and Boris Khaykovich 6
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.
J. Imaging 2018, 4(3), 50; https://doi.org/10.3390/jimaging4030050
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)
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.
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MDPI and ACS Style
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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