Simulations and concepts for a 2-D spin-echo modulated SANS (SEMSANS) instrument

Steven R. Parnell, Sergi Van Den Berg, Gregor Bolderink, Wim G. Bouwman

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The spin-echo small-angle neutron scattering (SESANS) technique utilises a series of inclined magnetic fields before and after the sample to encode the scattering angle into the polarisation to obtain a much higher resolution than in conventional SANS. The analogous technique (spin echo modulated SANS (SEMSANS)) implements spin manipulations before the sample only to encode the scattering into an intensity modulation. The technique can be combined with SANS to expand the length scale range probed from 1 nm to microns. Using McStas we show that using a series of four magnetic Wollaston prisms in two orthogonal pairs with a 90° rotation can be utilised to create SEMSANS modulations in 2-D. These modulations can also be of different periods in each encoding direction. This method can be applied to anisotropic scattering samples. Also this allows for the simultaneous measurement at two orthogonal independent spin-echo lengths. This technique yields directly information about the structure of oriented structures.

Original languageEnglish
Article number012007
Number of pages9
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2023
EventJoint 13th and 14th International Conference on Polarized Neutrons for Condensed Matter Investigations, PNCMI 2022 - Annapolis, United States
Duration: 25 Jul 202229 Jul 2022

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