Wide Angle Spherical Neutron Polarimetry at Oak Ridge National Laboratory
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).
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