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| Hauptseite > Publikationsdatenbank > Spherical neutron polarimetry at MAGiC |
| Hauptseite > Publikationsdatenbank > Spherical neutron polarimetry at MAGiC |
| Conference Presentation (Invited) | FZJ-2026-04197 |
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2026
Abstract: The instrument MAGIC is a single crystal diffractometer dedicated to magnetismresearch, which is built at the European Spallation Source ESS. It offers longitudinal XYZpolarisation analysis for a wavelength band from 2 Å to 6 Å. A novel extension to theinstrument MAGIC will be spherical neutron polarimetry. To date spherical neutronpolarimetry has been routinely established only in zero-field techniques, e.g. Cryopad[1], formeasuring the full polarisation tensor for single Bragg peaks on monochromatic instruments.Here we present a more powerful alternative route to spherical polarimetry based on aprecession technique [2,3] that can be fully adapted to a pulsed, polychromatic neutron beamand enables us to cover simultaneously a large section of the reciprocal space in time-of-flightLaue diffraction.Implementing spherical polarimetry by precession on the instrument MAGIC requires precisemagnetic field design. Two coils in the incoming beam path rotate the polarisation with respectto the field axis, determining inclination and precession angles. Both coils are ramped in timeaccording to the neutrons’ speed. A common phase angle is achieved by an additional, timeindependentspin-echo coil.Full simulations of the polarised neutron transport on the instrument MAGIC demonstrates thefeasibility of spherical polarimetry and using Mag2Pol[4] for data analysis.[1] F. Tasset, Physica B: Cond. Mat. 156, 627-630 (1989).[2] W. Schweika, Physica B: Cond. Mat. 335,157 -163 (2003).[3] W. Schweika, S. Easton and K.U. Neumann. Neutron News, 16(2), 14-17 (2005).[4] N. Qureshi, J. Appl. Cryst. 52, 175-185 (2019).
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