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Littérature scientifique sur le sujet « Bent-Laue optics »

Auteur : Grafiati

Publié le 14 mars 2023

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Articles de revues sur le sujet "Bent-Laue optics"

Qi, Peng, Xianbo Shi, Nazanin Samadi et Dean Chapman. « Bent Laue crystal anatomy : new insights into focusing and energy-dispersion properties ». Journal of Applied Crystallography 54, n^o 2 (14 février 2021) : 409–26. http://dx.doi.org/10.1107/s1600576720016428.

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X-ray Laue-type monochromators are common and essential optical components at many high-power X-ray facilities, e.g. synchrotron facilities. The X-ray optics of bent Laue crystals is a well developed area. An incident X-ray beam penetrating a bent Laue crystal will result in a diffracted beam with different angles and energies. There is a need for a way of organizing the rays that allows one to sort out the energy and spatial properties of the diffracted beam. The present work introduces a new approach for describing the general behaviour of bent Laue crystals from a ray-tracing point of view. This quasi-monochromatic beam approach provides an intuitive view of bent-crystal diffraction and leads to deeper understanding. It explains the energy and spatial properties of common and special cases of bent Laue optics, predicts phenomena that can improve energy-dispersion-related X-ray imaging techniques and provides a theoretical framework that makes ray-tracing simulation easier to realize.

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Lienert, U., C. Schulze, V. Honkimäki, Th Tschentscher, S. Garbe, O. Hignette, A. Horsewell et al. « Focusing Optics for High-Energy X-ray Diffraction ». Journal of Synchrotron Radiation 5, n^o 3 (1 mai 1998) : 226–31. http://dx.doi.org/10.1107/s0909049598001393.

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Novel focusing optical devices have been developed for synchrotron radiation in the energy range 40–100 keV. Firstly, a narrow-band-pass focusing energy-tuneable fixed-exit monochromator was constructed by combining meridionally bent Laue and Bragg crystals. Dispersion compensation was applied to retain the high momentum resolution despite the beam divergence caused by the focusing. Next, microfocusing was achieved by a bent multilayer arranged behind the crystal monochromator and alternatively by a bent Laue crystal. A 1.2 µm-high line focus was obtained at 90 keV. The properties of the different set-ups are described and potential applications are discussed. First experiments were performed, investigating with high spatial resolution the residual strain gradients in layered polycrystalline materials. The results underline that focused high-energy synchrotron radiation can provide unique information on the mesoscopic scale to the materials scientist, complementary to existing techniques based on conventional X-ray sources, neutron scattering or electron microscopy.

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Nesterets, Ya I., et S. W. Wilkins. « Evaluation of the focusing performance of bent Laue crystals using wave-optical theory ». Journal of Applied Crystallography 41, n^o 2 (8 mars 2008) : 237–48. http://dx.doi.org/10.1107/s0021889808000617.

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Quantitative analysis of the focusing performance of bent Laue crystals is carried out using the rigorous wave-optical formalism.Vianumerical solution of the Takagi equations and the Fresnel integral, the influence of diffraction on the formation of the image of an X-ray source is analysed. The results are compared with those obtained using a formalism based on the geometrical optics approximation and significant differences are found. A formula for the geometrical aberration of a cylindrically bent crystal is derived. The effect of the aberration on image formation is analysed.

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Mazzolari, Andrea, Riccardo Camattari, Valerio Bellucci, Gianfranco Paternò, Carlo Scian, Giovanni Mattei et Vincenzo Guidi. « Manufacturing of advanced bent crystals for Laue Optics for Gamma ObservationS (LOGOS) ». Nuclear Instruments and Methods in Physics Research Section B : Beam Interactions with Materials and Atoms 355 (juillet 2015) : 297–300. http://dx.doi.org/10.1016/j.nimb.2015.03.048.

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Schulze, C., P. Suortti et D. Chapman. « Test of a bent laue double crystal fixed exit monochromator ». Synchrotron Radiation News 7, n^o 3 (mai 1994) : 8–11. http://dx.doi.org/10.1080/08940889408261269.

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Wu Yufen, 毋玉芬, 肖沙里 Xiao Shali, 鲁建 Lu Jian, 钱家渝 Qian Jiayu, 刘利锋 Liu Lifeng et 黄显宾 Huang Xianbin. « Logarithmic Spiral Bent Laue Crystals for X-Ray Monochromatic Imaging Applications ». Chinese Journal of Lasers 40, n^o 6 (2013) : 0615001. http://dx.doi.org/10.3788/cjl201340.0615001.

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Ferrari, Claudio, Elisa Buffagni, Elisa Bonnini et Andrea Zappettini. « X-ray diffraction efficiency of bent GaAs mosaic crystals for the Laue project ». Optical Engineering 53, n^o 4 (10 avril 2014) : 047104. http://dx.doi.org/10.1117/1.oe.53.4.047104.

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Qi, Peng, Nazanin Samadi et Dean Chapman. « X-ray Spectral Imaging Program : XSIP ». Journal of Synchrotron Radiation 27, n^o 6 (14 septembre 2020) : 1734–40. http://dx.doi.org/10.1107/s1600577520010838.

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Spectral K-edge subtraction imaging and wide-field energy-dispersive X-ray absorption spectroscopy imaging are novel, related, synchrotron imaging techniques for element absorption contrast imaging and element speciation imaging, respectively. These two techniques serve different goals but share the same X-ray optics principles with a bent Laue type monochromator and the same data processing algorithms. As there is a growing interest to implement these novel techniques in synchrotron facilities, Python-based software has been developed to automate the data processing procedures for both techniques. In this paper, the concept of the essential data processing algorithms are explained, the workflow of the software is described, and the main features and some related utilities are introduced.

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Bonnini, Elisa, Elisa Buffagni, Andrea Zappettini, Stephen Doyle et Claudio Ferrari. « Surface-treated self-standing curved crystals as high-efficiency elements for X- and γ-ray optics : theory and experiment ». Journal of Applied Crystallography 48, n^o 3 (25 avril 2015) : 666–71. http://dx.doi.org/10.1107/s1600576715006809.

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The efficiency of a Laue lens for X- and γ-ray focusing in the energy range 60–600 keV is closely linked to the diffraction efficiency of the single crystals composing the lens. A powerful focusing system is crucial for applications like medical imaging and X-ray astronomy where wide beams must be focused. Mosaic crystals with a high density, such as Cu or Au, and bent crystals with curved diffracting planes (CDPs) are considered for the realization of a focusing system for γ-rays, owing to their high diffraction efficiency in a predetermined angular range. In this work, a comparison of the efficiency of CDP crystals and Cu and Au mosaic crystals was performed on the basis of the theory of X-ray diffraction. Si, GaAs and Ge CDP crystals with optimized thicknesses and moderate radii of curvature of several tens of metres demonstrate comparable or superior performance with respect to the higher atomic number mosaic crystals generally used. In order to increase the efficiency of the lens further, a stack of several CDP crystals is proposed as an optical element. CDP crystals were obtained by a surface-damage method, and a stack of two surface-damaged bent Si crystals was prepared and tested. Rocking curves of the stack were performed with synchrotron radiation at 19 keV to check the lattice alignment: they exhibited only one diffraction peak.

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Yan, Hanfei, Özgür Kalenci et I. C. Noyan. « Diffraction profiles of elastically bent single crystals with constant strain gradients ». Journal of Applied Crystallography 40, n^o 2 (12 mars 2007) : 322–31. http://dx.doi.org/10.1107/s0021889807003160.

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This work presents a set of equations that can be used to predict the dynamical diffraction profile from a non-transparent single crystal with a constant strain gradient examined in Bragg reflection geometry with a spherical incident X-ray beam. In agreement with previous work, the present analysis predicts two peaks: a primary diffraction peak, which would have still been observed in the absence of the strain gradient and which exits the specimen surface at the intersection point of the incident beam with the sample surface, and a secondary (mirage) peak, caused by the deflection of the wavefield within the material, which exits the specimen surface further from this intersection point. The integrated intensity of the mirage peak increases with increasing strain gradient, while its separation from the primary reflection peak decreases. The directions of the rays forming the mirage peak are parallel to those forming the primary diffraction peak. However, their spatial displacement might cause (fictitious) angular shifts in diffractometers equipped with area detectors or slit optics. The analysis results are compared with experimental data from an Si single-crystal strip bent in cantilever configuration, and the implications of the mirage peak for Laue analysis and high-precision diffraction measurements are discussed.

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Thèses sur le sujet "Bent-Laue optics"

di, trapani vittorio. « State-of-the-art setups for K-edge imaging ». Doctoral thesis, Università di Siena, 2021. http://hdl.handle.net/11365/1144523.

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Spectral imaging is an emerging area of X-ray imaging that includes all the techniques which exploit the energy-dependent absorption properties of the matter to either provide quantitative information about the scanned object or to discriminate different materials. Though the potentials of spectral imaging are well known for over many years, the interest on spectral techniques is rapidly increasing only in recent years due to the development and widespread of dedicated acquisition systems able to acquire simultaneous (or nearly simultaneous) X-ray images at different energies. In this context, the development of energy resolving X-ray photon counting detectors (XPCDs) and the increasing availability of synchrotron radiation can provide interesting solutions for spectral imaging applications such as e.g. the K-edge technique. This thesis presents the implementation and the optimization of two state-of-the art acquisition systems suitable for spectral imaging applications with particular interest on the K-edge technique. The first system is an acquisition setup for spectral Computed Tomography (CT) made by coupling a polychromatic source with an energy resolving XPCD implementing two energy thresholds. The work carried out with this setup concerned the thorough characterization of an innovative XPCD featuring a sharp energy resolution, the design of a dedicated image processing procedure to achieve high quality CT images and the development of an automated procedure to produce accurate 3D maps of a K-edge element within a sample. Moreover, to allow further optimization studies, a simulator able to reproduce X-ray images with energy resolving XPCDs has been modeled, developed and validated. The last part of this thesis presents the development and the implementation of an acquisition setup for spectral imaging at synchrotron sources based on bent-Laue crystal optics. The results achieved with a prototype setup optimized for energies around 20 keV are presented, the future developments of the technique are discussed.

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CAMATTARI, Riccardo. « Curved crystals as optical elements for focusing X- and γ rays in a Laue lens ». Doctoral thesis, Università degli studi di Ferrara, 2014. http://hdl.handle.net/11392/2388962.

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Curved crystals as optical elements for focusing X- and γ rays in a Laue lens Abstract This thesis is devoted to achieve a method to realize bent crystals in order to diffract hard X- and γ rays with high-efficiency. A simple and economical method that would lead to the production of accurate and homogeneous bent samples is presented. In fact, a homogeneous curvature is a necessary condition for the diffraction of the radiation with high efficiency and resolution. Furthermore, an appropriate physical model is given, to foresee the curvature of the samples as a function of the production parameters. Several silicon and germanium samples were bent and pre-characterized at the Sensor and Semiconductor Laboratory (SSL) of Ferrara, Italy. The focusing capabilities of the crystals were tested with monochromatic and polychromatic X- and γ rays at the European Synchrotron Radiation Facility (ESRF) and at the Institut Laue-Langevin (ILL) in Grenoble, France. Investigations and experimental validations of diffraction with unusual crystal configurations are described. Furthermore, two proposals of Laue lens are given. Such proposals were theoretical obtained with LaueGen, a genetic algorithm written for this purpose. Finally, the performance of these simulated Laue 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 Italian Space Agency (ASI). The final aim of the Laue project was the realization of a prototype of Laue lens composed of germanium and gallium arsenide bent crystals. In particular, the realization and the precharacterization of the germanium samples were performed during this Ph.D. period.

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Actes de conférences sur le sujet "Bent-Laue optics"

Qi, Peng, Xianbo Shi, Nazanin Samadi et Dean Chapman. « Focusing and energy dispersion properties of a cylindrically bent asymmetric Laue crystal ». Dans Advances in X-Ray/EUV Optics and Components XIV, sous la direction de Christian Morawe, Ali M. Khounsary et Shunji Goto. SPIE, 2019. http://dx.doi.org/10.1117/12.2525449.

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Shi, Xianbo. « Simulation of diffraction profiles for sagittally bent Laue crystals ». Dans SPIE Optical Engineering + Applications, sous la direction de Manuel Sanchez del Rio et Oleg Chubar. SPIE, 2011. http://dx.doi.org/10.1117/12.891520.

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Liccardo, V., E. Virgilli, F. Frontera, V. Valsan, V. Guidi et E. Buffagni. « Bent crystal selection and assembling for the LAUE project ». Dans SPIE Optical Engineering + Applications, sous la direction de Stephen L. O'Dell et Giovanni Pareschi. SPIE, 2013. http://dx.doi.org/10.1117/12.2023617.

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Mocella, Vito, Jean-Pierre Guigay, Jaromir Hrdy, Claudio Ferrero et Joanna Hoszowska. « Dynamic focusing of polychromatic incident beam with bent crystals in Laue geometry ». Dans Optical Science and Technology, SPIE's 48th Annual Meeting, sous la direction de Tetsuya Ishikawa, Albert T. Macrander et James L. Wood. SPIE, 2003. http://dx.doi.org/10.1117/12.505058.

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Ferrari, C., E. Buffagni, E. Bonnini et A. Zappettini. « X-ray diffraction efficiency of bent GaAs mosaic crystals for the LAUE project ». Dans SPIE Optical Engineering + Applications, sous la direction de Stephen L. O'Dell et Giovanni Pareschi. SPIE, 2013. http://dx.doi.org/10.1117/12.2024517.

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Guidi, V., N. Barrière, V. Bellucci, R. Camattari et I. Neri. « Bent crystals by surface grooving method for high-efficiency concentration of hard x-ray photons by a Laue lens ». Dans SPIE Optical Engineering + Applications, sous la direction de Stephen L. O'Dell et Giovanni Pareschi. SPIE, 2011. http://dx.doi.org/10.1117/12.895334.

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