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Small-angle neutron scattering (SANS) is the most significant neutrontechnique in terms of impact on science and engineering. However, the basicconcept of SANS facilities has not changed since the technique's inceptionabout 40 years ago, as all SANS instruments, save a few, are still designed aspinhole cameras. Here we demonstrate a novel concept for a SANS instrument,based on axisymmetric focusing mirrors. We build and test a small prototype,which shows a performance comparable to that of conventional large SANSfacilities. By using a detector with 50-micron pixels, we build the mostcompact SANS instrument in the world. This work, together with the recentdemonstration that such mirrors could increase the signal rate at least50-fold, while improving resolution, paves the way to novel SANS instruments,thus affecting a broad community of scientists and engineers.

Demonstration of a novel focusing small-angle neutron scattering instrument equipped with axisymmetric mirrors