Abstract
In this paper we report progresses in the realization of self-standing bent crystals, which are suitable as optical elements for Laue lenses, i.e. for optic to focus hard X-rays in the 100–1000 keV energy range. The curvature of the crystals is a key factor to enhance diffraction efficiency and energy bandpass for such an optic. In particular, two bent crystals featuring a thickness of 5 mm, made of Si and Ge respectively, were produced at the Sensor and Semiconductor Laboratory in Ferrara, Italy. The crystals were bent through the application of a carbon fibre composite. This proved to be a relatively low cost method for crystal bending, suitable for mass production. The manufactured samples were characterised via optical interferometry, and showed a fairly uniform curvature. Finally, the samples were tested exploiting hard X-ray diffraction at the ID11 facility of the European Synchrotron Radiation Facility (ESRF) in Grenoble, France. A careful analysis of the experimental data highlighted that the samples feature large energy bandpass, wide geometrical acceptance for incoming hard X-rays, and high diffraction efficiency. We therefore conclude that such self-standing crystals are good candidates as Laue lens components for astrophysics applications.
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Acknowledgements
We acknowledge partial financial support from ERC Ideas Consolidator Grant No.615089 CRYSBEAM. We also acknowledge the LAUPER project of INFN. Finally, we acknowledge Gerald Klug and Jens Griesmann from Disco Europe (Munich, Germany) for their support in crystal manufacturing.
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We acknowledge the partial financial support from ERC Ideas Consolidator Grant No.615089 CRYSBEAM.
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Camattari, R., Romagnoni, M., Mazzolari, A. et al. Thick self-standing bent crystals as optical elements for a Laue lens for applications in astrophysics. Exp Astron 46, 309–321 (2018). https://doi.org/10.1007/s10686-018-9603-4
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DOI: https://doi.org/10.1007/s10686-018-9603-4