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Proceedings Paper

Bent crystal selection and assembling for the LAUE project
Author(s): V. Liccardo; E. Virgilli; F. Frontera; V. Valsan; V. Guidi; E. Buffagni
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Paper Abstract

For the first time, with the Laue project, bent crystals are being used for focusing photons in the 80-300 keV energy range. The advantage is their high reflectivity and better Point Spread Function with respect to the mosaic at crystals. Simulations have already shown their excellent focusing capability which makes them the best candidates for a Laue lens whose sensitivity is also driven by the size of the focused spot. Selected crystals are Germanium (perfect, (111)) and Gallium Arsenide (mosaic, (220)) with 40 m curvature radius to get a spherical lens with 20 m long focal length. A lens petal is being built. We report the measurement technique by which we are able to estimate the exact curvature of each tile within a few percent of uncertainty and their diffraction efficiency. We also discuss some results.

Paper Details

Date Published: 26 September 2013
PDF: 9 pages
Proc. SPIE 8861, Optics for EUV, X-Ray, and Gamma-Ray Astronomy VI, 88610A (26 September 2013); doi: 10.1117/12.2023617
Show Author Affiliations
V. Liccardo, Univ. degli Studi di Ferrara (Italy)
Univ. de Nice Sophia-Antipolis (France)
E. Virgilli, Univ. degli Studi di Ferrara (Italy)
F. Frontera, Univ. degli Studi di Ferrara (Italy)
INAF - IASF Bologna (Italy)
V. Valsan, Univ. degli Studi di Ferrara (Italy)
Univ. de Nice Sophia-Antipolis (Italy)
V. Guidi, Univ. degli Studi di Ferrara (Italy)
E. Buffagni, IMEM, CNR, Parma (Italy)


Published in SPIE Proceedings Vol. 8861:
Optics for EUV, X-Ray, and Gamma-Ray Astronomy VI
Stephen L. O'Dell; Giovanni Pareschi, Editor(s)

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