Stack of quasi-mosaic thin lamellae as a diffracting element for Laue lenses

Year: 2014

Authors: Bellucci V., Camattari R., Guidi V., Bastie P.

Autors Affiliation: Univ Ferrara, INFN, Dept Phys & Earth Sci, I-44122 Ferrara, Italy; Natl Inst Opt CNR INO Sensor Lab, I-25123 Brescia, Italy; INFN Sect Ferrara, I-44122 Ferrara, Italy; Univ Grenoble 1, CNRS, UMR 5588, Lab Spectrometrie Phys, F-38402 St Martin Dheres, France.

Abstract: Crystals with curved diffracting planes have been investigated as high-efficiency optical components for the realization of a Laue lens for satellite-borne experiments in astrophysics. Curved crystals implementing the quasi-mosaic effect, namely an effect of crystalline anisotropy, are able to focus an X-ray beam to a size far smaller than that of the diffracting element, in turn increasing the focusing power of a Laue lens. This work provides first results about the feasibility of a self-standing stack composed of quasi-mosaic crystals. Stacking of crystalline lamellae is a solution to overcome the thickness limitation in existing self-standing quasi-mosaic crystals. Ten thin silicon crystalline lamellae were stacked, and then the planes affected by the quasi-mosaic effect were tested by polychromatic X-ray diffraction. The multicrystal behaved as one diffracting element, yielding a broad and smooth diffraction profile. The effective realization of a quasi-mosaic multicrystal opens up the prospective of building a Laue lens with a large integrated reflectivity, which leads to a high sensitivity, a necessary condition for the observation of celestial X-ray sources via a Laue lens.

Journal/Review: EXPERIMENTAL ASTRONOMY (PRINT)

Volume: 38 (1-2)      Pages from: 25  to: 40

More Information: The authors are thankful to INFN for financial support through the LOGOS project.
KeyWords: Hard X-rays; Laue lens; Diffraction; Stack; Quasi-mosaicity; Multicrystal; Lamellae
DOI: 10.1007/s10686-014-9391-4

Citations: 4
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