Anton Maksimenko et al 2004 Meas. Sci. Technol. 15 1251 doi:10.1088/0957-0233/15/7/004
Anton Maksimenko1, Hiroshi Sugiyama1,2, Keiichi Hirano2, Tetsuya Yuasa3 and Masami Ando1,2
Show affiliationsIn this paper we present a device designed to obtain dark-field contrast based on the asymmetrical Bragg-case transmission of x-rays. A beam with extremely small divergence, after asymmetrical reflection from a monochromator, passes through an object. It is deflected from the object's boundaries and internal inhomogeneities, collecting information about the structure in terms of deflections. For high x-ray energies (around 35 keV) the deflection angles are of the order of 10−6 rad. The spatial distribution of x-ray deflections can be visualized by using an analysing crystal. The advantages of using the asymmetrical analyser crystal arise from its narrow angular acceptance, which can provide higher image contrast at the x-ray detector. Also an asymmetrical analyser has a lower absorption than the symmetric Bragg case, due to smaller effective thickness of the analyser.
41.50.+h X-ray beam source magnets and x-ray optics for control of particle beams
07.85.Fv X- and gamma-ray sources, mirrors, gratings, and detectors
41.20.Jb Electromagnetic wave propagation; radiowave propagation
Accelerators, beams and electromagnetism
Issue 7 (July 2004)
Received 26 November 2003, in final form 7 May 2004
Published 28 May 2004
Anton Maksimenko et al 2004 Meas. Sci. Technol. 15 1251
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