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- W1209290064 abstract "Curved crystals as optical elements forfocusing X- and γ rays in a Laue lensAbstractThis thesis is devoted to achieve a method to realize bent crystals in order to diffract hard X- and γrays with high-efficiency. A simple and economical method that would lead to the production ofaccurate and homogeneous bent samples is presented. In fact, a homogeneous curvature is a necessarycondition for the diffraction of the radiation with high efficiency and resolution. Furthermore, anappropriate physical model is given, to foresee the curvature of the samples as a function of theproduction parameters. Several silicon and germanium samples were bent and pre-characterized at theSensor and Semiconductor Laboratory (SSL) of Ferrara, Italy. The focusing capabilities of the crystalswere tested with monochromatic and polychromatic X- and γ rays at the European SynchrotronRadiation Facility (ESRF) and at the Institut Laue-Langevin (ILL) in Grenoble, France. Investigationsand experimental validations of diffraction with unusual crystal configurations are described.Furthermore, two proposals of Laue lens are given. Such proposals were theoretical obtained withLaueGen, a genetic algorithm written for this purpose. Finally, the performance of these simulatedLaue lenses are shown and compared with the data available in the literature.The work of thesis was carried out within the Laue project, which is a project financed by the ItalianSpace Agency (ASI). The final aim of the Laue project was the realization of a prototype of Laue lenscomposed of germanium and gallium arsenide bent crystals. In particular, the realization and the precharacterizationof the germanium samples were performed during this Ph.D. period." @default.
- W1209290064 created "2016-06-24" @default.
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- W1209290064 date "2014-02-28" @default.
- W1209290064 modified "2023-10-16" @default.
- W1209290064 title "Curved crystals as optical elementsfor focusing X- and γ raysin a Laue lens" @default.
- W1209290064 hasPublicationYear "2014" @default.
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