Journal
AIP ADVANCES
Volume 9, Issue 8, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5099341
Keywords
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Funding
- U.S. Department of Commerce
- NIST Radiation and Physics Division
- NIST Center for Neutron Research
- National Institute of Standards and Technology (NIST) Quantum Information Program
- US Department of Energy [DE-FG02-97ER41042]
- National Science Foundation [PHY-1307426]
- Canadian Excellence Research Chairs (CERC) program
- Canada First Research Excellence Fund (CFREF)
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Director's office of NIST
- U.S. Department of Energy (DOE) [DE-FG02-97ER41042] Funding Source: U.S. Department of Energy (DOE)
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The recent development of phase-grating moire neutron interferometry promises a wide range of impactful experiments from dark-field imaging of material microstructure to precise measurements of fundamental constants. However, the contrast of 3% obtained using this moire interferometer was well below the theoretical prediction of 30% using ideal gratings. It is suspected that non-ideal aspects of the phase-gratings was a leading contributor to this deficiency and that phase-gratings needed to be quantitatively assessed and optimized. Here we characterize neutron diffraction from phase-gratings using Bragg diffraction crystals to determine the optimal phase-grating orientations. We show well-defined diffraction peaks and explore perturbations to the diffraction peaks and the effects on interferometer contrast as a function of grating alignment. This technique promises to improve the contrast of the grating interferometers by providing in-situ aides to grating alignment.
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