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.
Original language | English |
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Article number | 865 |
Journal | Scientific Reports |
Volume | 7 |
Issue number | 1 |
DOIs | |
State | Published - Dec 1 2017 |
Funding
This Research is sponsored by the Laboratory Directed Research and Development Program of Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy. This research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. We would like to acknowledge Jak Doskow and Thomas Rinckel of Indiana University, the team members of the HFIR, Gerald Brent Taylor, Michael Cox, Harish Agrawal, Mike Harrington, Ron G Maples, John Ray Stout, Ron Conaway, John William Carruth, Stephen Kulan, Larry R. Senesac, Gary A. Taufer and Ray Gregory, for their help with the experiments. RP is grateful to the University of California at Santa Barbara MRSEC for the use of their facilities during part of this project. The UCSB MRSEC is supported by the National Science Foundation, Division of Materials Research through grant number 1121053.