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The FacilityThe Neutron Interferometry and Optics Facility (NIOF) located in the NIST Center for Neutron Research Guide Hall is one of the world's premier user facilities for neutron interferometry and related neutron optical measurements. A neutron interferometer (NI) splits, then recombines neutron waves. This gives the NI its unique ability to experimentally access the phase of neutron waves. Phase measurements are used to study the magnetic, nuclear, and structural properties of materials, as well fundamental questions in quantum physics. Related, innovative neutron optical techniques for use in condensed matter and materials science research are being developed.Neutrons are extracted from a dual-crystal parallel-tracking monochromator system, providing neutron energies in a range of 4 meV to 20 meV. Both polarized and unpolarized neutrons are available. Neutrons are counted with integrating 3He detectors or by high resolution position-sensitive detectors (with a resolution better than 50 µm). The sensitivity of the apparatus is greatly enhanced by state-of-the-art thermal, acoustical and vibration isolation systems. To reduce vibration, the NIOF is built on its own foundation, separate from the rest of the building. The position of the NI is maintained to high precision by a computer-controlled servo system. The result is a NI facility with exceptional phase stability and fringe visibility.
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