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Curved focusing crystals for hard X-ray astronomy |
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| Authors: | C Ferrari E Buffagni E Bonnini D Korytar |
| Institution: | 1. IMEM-CNR Institute, Parma, Parco Area delle Scienze 37/A, 43124, Parma, Italy 2. Physics Department, Parma University, Viale G. P. Usberti 7/A, 43124, Parma, Italy 3. Institute of Electrical Engineering — SAS, Dúbravská cesta 9, 84104, Bratislava, Slovak Republik |
| Abstract: | A lens made by a properly arranged array of crystals can be used to focus x-rays of energy ranging from 30 to 500 keV for x-ray astronomy. Mosaic or curved crystals can be employed as x-ray optical elements. In this work self standing curved focusing Si and GaAs crystals in which the lattice bending is induced by a controlled damaging process on one side of planar crystals are characterized. Diffraction profiles in Laue geometry have been measured in crystals at x-ray energies E = 17, 59 and 120 keV. An enhancement of diffraction efficiency is found in asymmetric geometries. |
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