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Title: New capabilities in high-resolution neutron Larmor diffraction at ORNL

Using superconducting magnetic Wollaston prisms, high-resolution neutron Larmor diffraction has been implemented at the High-Flux Isotope Reactor of Oak Ridge National Laboratory (ORNL), Tennesse, USA. This technique allows the inverse relationship between the achievable diffraction resolution and the usable neutron flux to be overcome. Instead of employing physically tilted radio-frequency spin flippers, the method uses magnetic Wollaston prisms which are electromagnetically tuned by changing the field configurations in the device. As implemented, this method can be used to measure lattice-spacing changes induced, for example, by thermal expansion or strain with a resolution of Δd/d ≃ 10 –6, and the splitting of sharp Bragg peaks with a resolution of Δd/d = 3 × 10 –4. The resolution for discerning a change in the profile of a Bragg peak is Δd/d < 10 –5. This is a remarkable degree of precision for a neutron diffractometer as compact as the one used in this implementation. Higher precision could be obtained by implementing this technique in an instrument with a larger footprint. In conclusion, the availability of this technique will provide an alternative when standard neutron diffraction methods fail and will greatly benefit the scientific communities that require high-resolution diffraction measurements.
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [1] ;  [3] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ;  [4] ; ORCiD logo [1] ;  [5]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Indiana Univ., Bloomington, IN (United States)
  3. Delft Univ. of Technology, Delft (The Netherlands)
  4. Univ. of Tokyo, Chiba (Japan)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Indiana Univ., Bloomington, IN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Journal of Applied Crystallography (Online)
Additional Journal Information:
Journal Name: Journal of Applied Crystallography (Online); Journal Volume: 51; Journal Issue: 3; Journal ID: ISSN 1600-5767
Publisher:
International Union of Crystallography
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Larmor diffraction; magnetic Wollaston prisms; neutron spin Larmor labelling; neutron precession; high-resolution diffraction
OSTI Identifier:
1485010

Li, Fankang, Feng, Hao, Thaler, Alexander Nicholas, Parnell, Steven R., Crow, Jr., Lowell, Matsuda, Masaaki, Ye, Feng, Kimura, Tsuyoshi, Fernandez-Baca, Jaime A., and Pynn, Roger. New capabilities in high-resolution neutron Larmor diffraction at ORNL. United States: N. p., Web. doi:10.1107/S1600576718004211.
Li, Fankang, Feng, Hao, Thaler, Alexander Nicholas, Parnell, Steven R., Crow, Jr., Lowell, Matsuda, Masaaki, Ye, Feng, Kimura, Tsuyoshi, Fernandez-Baca, Jaime A., & Pynn, Roger. New capabilities in high-resolution neutron Larmor diffraction at ORNL. United States. doi:10.1107/S1600576718004211.
Li, Fankang, Feng, Hao, Thaler, Alexander Nicholas, Parnell, Steven R., Crow, Jr., Lowell, Matsuda, Masaaki, Ye, Feng, Kimura, Tsuyoshi, Fernandez-Baca, Jaime A., and Pynn, Roger. 2018. "New capabilities in high-resolution neutron Larmor diffraction at ORNL". United States. doi:10.1107/S1600576718004211. https://www.osti.gov/servlets/purl/1485010.
@article{osti_1485010,
title = {New capabilities in high-resolution neutron Larmor diffraction at ORNL},
author = {Li, Fankang and Feng, Hao and Thaler, Alexander Nicholas and Parnell, Steven R. and Crow, Jr., Lowell and Matsuda, Masaaki and Ye, Feng and Kimura, Tsuyoshi and Fernandez-Baca, Jaime A. and Pynn, Roger},
abstractNote = {Using superconducting magnetic Wollaston prisms, high-resolution neutron Larmor diffraction has been implemented at the High-Flux Isotope Reactor of Oak Ridge National Laboratory (ORNL), Tennesse, USA. This technique allows the inverse relationship between the achievable diffraction resolution and the usable neutron flux to be overcome. Instead of employing physically tilted radio-frequency spin flippers, the method uses magnetic Wollaston prisms which are electromagnetically tuned by changing the field configurations in the device. As implemented, this method can be used to measure lattice-spacing changes induced, for example, by thermal expansion or strain with a resolution of Δd/d ≃ 10–6, and the splitting of sharp Bragg peaks with a resolution of Δd/d = 3 × 10–4. The resolution for discerning a change in the profile of a Bragg peak is Δd/d < 10–5. This is a remarkable degree of precision for a neutron diffractometer as compact as the one used in this implementation. Higher precision could be obtained by implementing this technique in an instrument with a larger footprint. In conclusion, the availability of this technique will provide an alternative when standard neutron diffraction methods fail and will greatly benefit the scientific communities that require high-resolution diffraction measurements.},
doi = {10.1107/S1600576718004211},
journal = {Journal of Applied Crystallography (Online)},
number = 3,
volume = 51,
place = {United States},
year = {2018},
month = {4}
}