Small Angle Scattering for Engineering and Material Science is mostly done with neutrons, because the available SAXS instruments do not offer the required penetration lengths. I12 will operate at 50-150 keV, offering potential for SAXS at high photon energies that so far has not been exploited. SAXS measurements of correlation on the nanometre-scale could reveal microstructural information that is essential to Engineering and Material Science, particularly for the characterization of deformation on the grain and sub-grain level. The technique is complementary to imaging as it offers a higher resolution in real-space units.
The key-elements for high energy x-ray small angle scattering are now available: efficient detectors with good spatial resolution (10-30 µm) at high energies, focusing optics and a high brilliance source for the photon energy range between 50 keV and 150 keV.
In the first experimental hutch of I12, it will be possible to place a 2D detector at a distance of 4.5 m from the sample. Larger sample-to-detector distances of around 30 m could be set up with the detector in the third optics hutch, located between the first and the second experimental hutch.
Rat tail collagen SAXS standard
Fig: Pattern from rat tail collagen SAXS standard, showing diffraction orders 1 to 11. Image taken with large area 2D detector during commissioning experiment, beam energy approx. 80 keV.
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