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High resolution neutron Larmor diffraction using superconducting magnetic Wollaston prisms

Journal Article (2017)
Author(s)

Fankang Li (Indiana University, Oak Ridge National Laboratory)

Hao Feng (Indiana University)

Alexander N. Thaler (Oak Ridge National Laboratory)

Steven Parnell (TU Delft - Applied Sciences)

William A. Hamilton (Oak Ridge National Laboratory)

Lowell Crow (Oak Ridge National Laboratory)

Wencao Yang (Indiana University)

Amy B. Jones (Oak Ridge National Laboratory)

Hongyu Bai (SLAC National Accelerator Laboratory)

Masaaki Matsuda (Oak Ridge National Laboratory)

David V. Baxter (Indiana University)

Thomas Keller (Max-Planck-Institut für Festkörperforschung)

Jaime A. Fernandez-Baca (University of Tennessee, Oak Ridge National Laboratory)

Roger Pynn (Indiana University, Oak Ridge National Laboratory)

Research Group
RST/Fundamental Aspects of Materials and Energy
DOI related publication
https://doi.org/10.1038/s41598-017-00740-5 Final published version
More Info
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Publication Year
2017
Language
English
Research Group
RST/Fundamental Aspects of Materials and Energy
Volume number
7
Article number
865
Downloads counter
323
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Institutional Repository
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Abstract

The neutron Larmor diffraction technique has been implemented using superconducting magnetic Wollaston prisms in both single-arm and double-arm configurations. Successful measurements of the coefficient of thermal expansion of a single-crystal copper sample demonstrates that the method works as expected. The experiment involves a new method of tuning by varying the magnetic field configurations in the device and the tuning results agree well with previous measurements. The difference between single-arm and double-arm configurations has been investigated experimentally. We conclude that this measurement benchmarks the applications of magnetic Wollaston prisms in Larmor diffraction and shows in principle that the setup can be used for inelastic phonon line-width measurements. The achievable resolution for Larmor diffraction is comparable to that using Neutron Resonance Spin Echo (NRSE) coils. The use of superconducting materials in the prisms allows high neutron polarization and transmission efficiency to be achieved.