Abstract
We have designed, fabricated and operated a novel Bragg prism monochromator-analyser combination. With a judicious choice of the Bragg reflection, its asymmetry and the apex angle of the silicon single crystal prism, the monochromator has produced a neutron beam with sub-arcsec collimation. A Bragg prism analyser with the opposite asymmetry has been tailored to accept a still sharper angular profile. With this optimized monochromator-analyser pair, we have attained the narrowest and sharpest neutron angular profile to date. At this facility, we have recorded the first SUSANS spectra spanning wave vector transfers Q ∼ 10−6 Å−1 to characterize samples containing agglomerates up to tens of micrometres in size.
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Wagh, A.G., Abbas, S., Strobl, M. et al. Bragg prism monochromator and analyser for super ultra-small angle neutron scattering studies. Pramana - J Phys 71, 1171–1175 (2008). https://doi.org/10.1007/s12043-008-0242-6
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DOI: https://doi.org/10.1007/s12043-008-0242-6
Keywords
- Neutron collimation
- sub-arcsec collimation
- Bragg prism
- super ultra-small angle neutron scattering
- dynamical diffraction