PoS - Proceedings of Science
Volume 379 - The 18th International Workshop on Polarized Sources, Targets, and Polarimetry (PSTP2019) - Polarized Neutrons
Wide Angle Spherical Neutron Polarimetry at Oak Ridge National Laboratory
N. Silva,* T. Wang, C. Jiang, F. Li, L. Debeer-Schmitt, M. Masaaki, J. Ruff, R. Pynn, T. Tong, B. Winn
*corresponding author
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Published on: September 23, 2020
Developing Wide Angle Spherical Neutron Polarimetry at Oak Ridge National Laboratory

Spherical Neutron Polarimetry (SNP) analyzes complex magnetic structures through distinguishing contributions from nuclear-magnetic interference and chiral structure in addition to nuclear magnetic scattering separation. This analysis is achieved through determining all components in the polarization transfer process. Currently, wide-angle SNP is being realized at Oak Ridge National Laboratory (ORNL) for multiple beamlines including: the polarized triple-axis spectrometer (HB-1) and general-purpose small angle neutron scattering instrument (CG-2) at the High Flux Isotope Reactor (HFIR), as well as the hybrid spectrometer (HYSPEC) at the Spallation Neutron Source (SNS). The SNP device consists of three units: incoming/outgoing neutron polarization, sample environment and a zero-field chamber. The incoming/outgoing neutron polarization regions use high-T_c superconducting YBCO films and mu-metal to achieve full control of neutron polarization. The sample environment is an evaporation refrigerator with a customized tail piece placed into the zero-field chamber. The device has been fully assembled and tested at the University of Missouri Research Reactor (MURR).
DOI: https://doi.org/10.22323/1.379.0032
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