Prospects of resonance spin echo

We want to review the applications of high-frequency-flippers in neutron sp in echo and related fields: Two separated flippers of this type can replace a homogenous static magnetic held in a spin-echo spectrometer. We describe the spin-echo instruments at Saclay and Berlin relying on such flippers an d present some measurements. By tilting these coils with respect to the bea m axis, one can determine line widths of phonons with unprecedented precisi on. First experiments are shown. With two flippers driven at different freq uencies one can realise an instrument ("MIEZE"), where the intensity at the detector is modulated with a frequency up to several MHz. Its use for high -resolution quasielastic scattering from protonated samples is demonstrated . The high-frequency signal may be used for "neutron computer holography" - we discuss a possible realisation. (C) 1999 Elsevier Science B.V. All righ ts reserved.