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Design and performance of the variable‐wavelength Bonse–Hart ultra‐small‐angle neutron scattering diffractometer KOOKABURRA at ANSTO
Author(s) -
Rehm Christine,
de Campo Liliana,
Brûlé Alain,
Darmann Frank,
Bartsch Friedl,
Berry Andrew
Publication year - 2018
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s1600576717016879
Subject(s) - diffractometer , neutron , optics , materials science , neutron scattering , bragg's law , scattering , small angle neutron scattering , wavelength , reflection (computer programming) , physics , nuclear physics , diffraction , computer science , scanning electron microscope , programming language
The double‐crystal ultra‐small‐angle neutron scattering (USANS) diffractometer KOOKABURRA at ANSTO was made available for user experiments in 2014. KOOKABURRA allows the characterization of microstructures covering length scales in the range of 0.1–10 µm. Use of the first‐ and second‐order reflections coming off a doubly curved highly oriented mosaic pyrolytic graphite premonochromator at a fixed Bragg angle, in conjunction with two interchangeable pairs of Si(111) and Si(311) quintuple‐reflection channel‐cut crystals, permits operation of the instrument at two individual wavelengths, 4.74 and 2.37 Å. This unique feature among reactor‐based USANS instruments allows optimal accommodation of a broad range of samples, both weakly and strongly scattering, in one sample setup. The versatility and capabilities of KOOKABURRA have already resulted in a number of research papers, clearly demonstrating that this instrument has a major impact in the field of large‐scale structure determination.