ИСТИНА

In the spin-echo small-angle neutron scattering method (SESANS) the scattering angle is encoded by phase of neutron spin Larmor precession, acquired when a neutron passes through the magnetic field area. For increasing the sensitivity to scattering angle, the boundaries of magnetic fields of spin rotators are tilted and form an acute angle with the direction of the beam. However, this method maximizes the angular resolution only for neutrons scattered in one preferred scattering plane - the plane of tilt of magnetic field. For neutrons scattered in other directions the angular resolution is reduced, that worsens the overall resolution. To partially overcome this problem, we propose to use the sectoral collimation in the scattered beam. It is shown by VITESS simulations for sectoral and rectangular collimations in the SESANS with time-gradient magnetic fields, that the use of the sectoral collimators improves resolution and allows for a gain in the measurement time in spite of excluding a part of scattered neutrons.