Scientific Review: The Resonance Spin Echo Spectrometer RESEDA at the FRM II

Neutron spin echo (NSE) was introduced in 1972 by F. Mezei [1] as the highest-resolution neutron scattering technique and, in the years since, has proved to serve as a unique technique for length-scale sensitive studies on the ns-time scale. Thus, NSE has been employed in many fields, for example, in glass physics, soft matter, and magnetism. In NSE, magnetic spin precession fields translate directly the time-of-flight difference of the neutrons before and after being scattered from the sample, into a final neutron spin phase. In the simplest case, these magnetic fields are provided by long solenoids, and the neutrons cross these coils along their symmetry axis.