Investigating time of flight spin echo modulation for small angle neutron scattering through experiments and simulation

A spin echo modulated small angle neutron scattering SEMSANS instrument in a time of flight TOF mode will be able to excel at pulsed neutron sources such as the European Spallation Source ESS , currently under construction. This work compares experimental data from a TOF SEMSANS setup, where a spatial beam modulation of a white beam is obtained using triangular field coils, with Monte Carlo ray tracing simulations. The experiments and simulations in accordance demonstrate that a good contrast can be achieved when using a constant field in the triangular coils. In the reported setup only neutrons with certain wavelengths rotate by a Larmor precession angle that spatially modulates their polarization to coincide with the period of a grating installed at the detector position. This is shown by measuring with a broad wavelength range while scanning the echo conditio