Department of Physics, Indiana University, Bloomington, Indiana 47408, USA.
Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA.
Rev Sci Instrum. 2023 Mar 1;94(3):033901. doi: 10.1063/5.0128097.
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.
中子共振自旋回波（NRSE）技术有可能通过使用射频（rf）中子自旋翻转器来提高中子散射中的傅立叶时间和能量分辨率。然而，由于射频翻转器之间的中子路径长度的变化而产生的像差会降低极化率。在这里，我们开发并测试了一种横向静磁场磁铁，将其放置在射频翻转器之间，以纠正这些像差。原型校正磁铁都使用 McStas（一种蒙特卡罗中子射线追踪软件包）在 NRSE 光束线上进行了模拟，并使用中子进行了测量。原型的结果表明，这种静磁场设计可以校正横向场 NRSE 像差。
