Abstract
A composite system of CuGe crystals, with different lattice spacings, was designed and set-up. The centers of gravity of the crystals are located on a circle, so that from a parallel primary polychromatic neutron beam a focussed monochromatic beam is selected. The variation of the lattice spacing compensates the variation of the Bragg angle along the circle, so that each crystal diffracts neutrons of the same wavelength. The system is therefore equivalent to a monochromatizing neutron lens. The focal length is 185 cm. The monochromatic neutron beam diffracted by the lens was compared with that diffracted by a conventional mosaic crystal, by carrying out an analysis in momentum space.
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