Novel polarized neutron tools

Eddy Lelievre-Berna

doi:10.1117/12.455781

18 November 2002 Novel polarized neutron tools

Eddy Lelievre-Berna

Proceedings Volume 4785, Advances in Neutron Scattering Instrumentation; (2002) https://doi.org/10.1117/12.455781
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

³He neutron spin filters and zero-field polarimeters are being intensively developed in order to better investigate exotic magnetic systems and prepare the construction of polarized neutron instruments at spallation neutron sources. There are several incentives for using ³He spin filters. They are simple transmission devices having minimal impact on the optics of the neutron beam and they are broadband with properties that vary only weakly with neutron energy. However, a very homogeneous magnetic field is required for long relaxation time of the ³He polarization. We will present devices which remove this difficulty, even in front of a cryomagnet producing a large inhomogeneous stray field. With a zero-field polarimeter Cryopad, the three components of the scattered spin-polarization vector are measured, which is not possible by standard uniaxial polarization analysis. In the case of magnetic structures, Cryopad allows the direct determination of the direction and phase of the magnetic interaction vector. Hence, it is the most powerful tool for solving non-trivial antiferromagnetic structures. In recent years, the technique has been used to correct major errors in magnetic structures previously determined with other techniques. Efforts are being made to adapt this technique to the case of a spallation neutron source.

Citation Download Citation

Eddy Lelievre-Berna "Novel polarized neutron tools", Proc. SPIE 4785, Advances in Neutron Scattering Instrumentation, (18 November 2002); https://doi.org/10.1117/12.455781

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