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EnglishThe grooving technique was employed for manufacturing a self-standing curved Ge crystal. The crystal focuses hard X-rays with high efficiency by diffraction in Laue geometry through asymmetric bent planes. The sample was tested at the Institut Laue-Langevin (Grenoble, France), undergoing two types of characterization. A monochromatic and low-divergence gamma-ray beam was used to test the curvature of asymmetric planes, showing a diffraction performance better than for any mosaic crystal under equal conditions. Then, the focusing capability of the crystal was probed through a polychromatic and fine-focus hard X-ray beam. Asymmetric (220) planes were chosen for analysis because of the impossibility to obtain a curvature along this family of planes via any symmetric configuration in focusing crystals. A method for calculating the curvatures induced in any family of lattice planes is also presented.
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| Data di pubblicazione: | 2015 | |
| Titolo: | High-efficiency diffraction and focusing of X-rays through asymmetric bent crystalline planes | |
| Autori: | V. Bellucci; G. Paternò; R. Camattari; V. Guidi; M. Jentschel; P. Bastie | |
| Rivista: | JOURNAL OF APPLIED CRYSTALLOGRAPHY | |
| Abstract: | The grooving technique was employed for manufacturing a self-standing curved Ge crystal. The crystal focuses hard X-rays with high efficiency by diffraction in Laue geometry through asymmetric bent planes. The sample was tested at the Institut Laue-Langevin (Grenoble, France), undergoing two types of characterization. A monochromatic and low-divergence gamma-ray beam was used to test the curvature of asymmetric planes, showing a diffraction performance better than for any mosaic crystal under equal conditions. Then, the focusing capability of the crystal was probed through a polychromatic and fine-focus hard X-ray beam. Asymmetric (220) planes were chosen for analysis because of the impossibility to obtain a curvature along this family of planes via any symmetric configuration in focusing crystals. A method for calculating the curvatures induced in any family of lattice planes is also presented. | |
| Digital Object Identifier (DOI): | 10.1107/S1600576714024960 | |
| Handle: | http://hdl.handle.net/11392/2289621 | |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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