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Instrument 1A

Discrete multiwavelength spectrum created by a family of Bragg reflections.

For more information, contact Instrument Scientist: Michael Agamalian,, 865.576.0903 The TOF-USANS instrument is designed for the study of hierarchical structures in natural and man-made materials. It can be considered an advanced version of the classical Bonse- Hart Double-Crystal Diffractometer (DCD), which, in contrast with its single-wavelength reactor-based analog, will operate with the discrete multiwavelength spectrum of Bragg reflections. The optical scheme of the TOF-USANS instrument is similar to that of the conventional Bonse-Hart DCD; however, the pulsed nature of SNS offers an opportunity to separate the orders of Bragg reflection in time space using the time-of-flight technique.

Thus, the concept of the TOF-USANS technique allows optimization of the neutron flux and the Q resolution, following the principles of dynamical diffraction theory.

Applications Ultra-small-angle neutron scattering provides a new way to solve a broad range of scientific problems such as: Supramolecular structure of polymer blends Macroscale self-similarity of rocks Structure of colloidal crystals and alloys Hydration of cement pasts Aggregation in colloidal dispersions Self-assembling of polymers Mesoscopic structure of natural composites Structure of granular powders Morphology of colloidal reinforcing fillers Structure and morphology of complex fluids Rheology and morphology of hydrogels 06-G01637D/gim Moderator Decoupled poisoned hydrogen Source- detector distance 30 m Focusing premono- chromator Germanium mosaic Ge(220) crystal Monochro- mator and analyzer Si(220) channel-cut, triple-bounce crystals Bragg angle 70 Wavelength spectrum 4 Bragg reflections at 3.6, 1.8, 1.2, 0.9 Q range 7 x 10-6 -1 < Q < 5 x 10-3 -1 Specifications March 2010 Status: To be commissioned in 2014

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