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@INPROCEEDINGS{Schweika:1044397,
      author       = {Schweika, W. and Vasiukov, D. and Soltner, H. and
                      Fabrèges, S. and Lee, W.},
      title        = {{S}pherical neutron polarimetry at {MAG}i{C}},
      reportid     = {FZJ-2025-03163},
      year         = {2025},
      abstract     = {The instrument MAGIC at ESS has been designed with an
                      option for longitudinal XYZ polarisation analysis, highly
                      performing in a wavelength band from 2 to 6 Å. A novel
                      extension to the instrument MAGIC will be spherical neutron
                      polarimetry. To date spherical neutron polarimetry has been
                      routinely established only in zero-field techniques, e.g.
                      Cryopad[1], for measuring the full polarisation tensor for
                      single Bragg peaks on monochromatic instruments. Here we
                      present a more powerful alternative route to spherical
                      polarimetry based on a precession technique [2,3] that can
                      be fully adapted to a pulsed, polychromatic neutron beam and
                      enables us to cover simultaneously a large section of the
                      reciprocal space in time-of-flight Laue diffraction.
                      Implementing spherical polarimetry by precession on the
                      instrument MAGIC requires precise magnetic field design. Two
                      coils in the incoming beam path rotate the polarisation with
                      respect to the field axis, determining inclination and
                      precession angles. Both coils are ramped in time according
                      to the neutrons’ speed. A common phase angle is achieved
                      by an additional, time-independent spin-echo coil. Full
                      simulations of the polarised neutron transport on the
                      instrument MAGIC not only demonstrate the feasibility of
                      spherical polarimetry but also its excellent performance.
                      [1] F. Tasset, Zero field neutron polarimetry. Physica B:
                      Cond. Mat. 156, 627-630 (1989).[2] W. Schweika,
                      Time-of-flight and vector polarization analysis for diffuse
                      neutron scattering. Physica B: Cond. Mat. 335,157 -163
                      (2003).[3] W. Schweika, S. Easton and K.U. Neumann. Vector
                      Polarization Analysis on DNS. Neutron News, 16(2), 14-17
                      (2005).},
      month         = {Jul},
      date          = {2025-07-06},
      organization  = {The International Conference on
                       Neutron Scattering, Bella Center in
                       Copenhagen, Denmark, with the last day
                       at the European Spallation Source (ESS)
                       in nearby Lund, Sweden (Denmark), 6 Jul
                       2025 - 10 Jul 2025},
      subtyp        = {Invited},
      cin          = {JCNS-2 / JARA-FIT / ITE},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)ITE-20250108},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/1044397},
}