Speaker
Description
Spherical neutron polarimetry is a unique and powerful tool to study certain complex magnetic structures. At the Oak Ridge National Laboratory (ORNL), we have developed a state-of-the-art Spherical Neutron Polarimetry (SNP) system for neutron instruments at High Flux Isotope Reactor (HFIR), which is now in HFIR user program. This system, designed for high precision and versatility, offers a new dimension in polarized neutron scattering experiments. Our SNP system is characterized by its unique ability to manipulate and analyze the polarization state of neutrons in all three dimensions, unveiling new information otherwise inaccessible with conventional neutron polarimetry. This capability allows for a more comprehensive understanding of magnetic properties of materials. The control of neutron polarization is realized via a combination of adiabatic and non-adiabatic polarization transitions. The system's design includes utilizing high-Tc YBCO films and a range of advanced polarization manipulation devices, ensuring precise neutron polarization control and enabling a wide range of scattering angles. The development of the SNP system not only marks a significant milestone in polarized neutron scattering at ORNL but also opens up new possibilities for future research in physics, chemistry, and materials science. This talk presents an overview of the system's design, capabilities, and some of the online tests at HFIR.
