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A neutron optical transport system is proposed which comprises nested shortelliptical mirrors located halfway between two common focal points M and M'. Itimages cold neutrons from a diverging beam or a source with finite size at M bysingle reflections onto a spot of similar size at M'. Direct view onto theneutron source is blocked by a central absorber with little impact on thetransported solid angle. Geometric neutron losses due to source size can bekept small using modern supermirrors and distances M-M' of a few tens ofmetres. Very short flat mirrors can be used in practical implementations.Transport with a minimum of reflections remedies losses due to multiplereflections that are common in long elliptical neutron guides. Moreover,well-defined reflection angles lead to new possibilities for enhancing thespectral quality of primary beams, such as clear-cut discrimination of shortneutron wavelengths or beam monochromation using bandpass supermirrors.Multi-mirror imaging systems may thus complement or even replace ordinaryneutron guides, in particular at the European Spallation Source.

Multi-mirror imaging optics for low-loss transport of divergent neutron beams and tailored wavelength spectra