Laue lens development for hard X-rays (>60 keV)

Results of reflectivity measurements of mosaic crystal samples of Cu (111) are reported. These tests were performed in the context of a feasibility study of a hard X-ray focusing telescope for space astronomy based on mosaic crystals in transmission configuration (Laue lens). The Laue lens assumed has the shape of a sphere segment with radius R equal to 2 times the focal length f of the lens and is made of flat mosaic crystal tiles properly positioned in the lens. The goal is to develop lenses for astrophysical applications with broad energy passband from 60 to 600 keV. The samples were grown and worked for this project at the Institute Laue-Langevin (ILL) in Grenoble, France, while the reflectivity tests were performed at the X-ray facility of the Physics Department of the University of Ferrara.