The neutron resonance spin echo (NRSE) technique has the potential to increase the Fourier time and energy resolution in neutron scattering by using radio-frequency (rf) neutron spin-flippers. However, aberrations arising from variations in the neutron path length between the rf flippers reduce the polarization. Here, we develop and test a transverse static-field magnet, a series of which are placed between the rf flippers, to correct for these aberrations. The prototype correction magnet was both simulated in an NRSE beamline using McStas, a Monte Carlo neutron ray-tracing software package, and measured using neutrons. The results from the prototype demonstrate that this static-field design corrects for transverse-field NRSE aberrations.
@article{arxiv.2209.11635,
title = {Correcting Aberrations of a Transverse-Field Neutron Resonance Spin Echo Instrument},
author = {Stephen J. Kuhn and Sam McKay and Fankang Li and Robert M. Dalgliesh and Eric Dees and Kaleb Burrage and Jiazhou Shen and Roger Pynn},
journal= {arXiv preprint arXiv:2209.11635},
year = {2023}
}