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检索条件"任意字段=Conference on Advances in Computational Methods for X-Ray and Neutron Optics"

共 113 条记录，以下是41-50 订阅

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Calculation of the instrumental profile function for a powder diffraction beamline used in nanocrystalline material research 3

Calculation of the instrumental profile function for a powde...

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conference on advances in computational methods for x-ray optics III

作者： Rebuffi, Luca Scardi, Paolo Elettra Sincrotrone Trieste Str Statale 14Km 163-5 I-34149 Trieste Italy Univ Trento Environm & Mech Engn Dept Civil I-38123 Trento Italy

ISBN: (纸本)9781628412369

ray-tracing algorithms are used to simulate the instrumental function of a synchrotron beamline targeted to the advanced characterization of nanocrystalline materials by powder diffraction. The characteristics of the source, a bending magnet in the present case of study, and the optics influence the instrumental profile, which is a key parameter for obtaining information on the nanostructure. We combine the SHADOW simulation with the calculation of powder diffraction profiles from standard materials, into a high-level workflow environment based on the ORANGE software, allowing us to integrate data analysis fitting software with realistic information.

关键词： Diffraction Crystals Optical simulations Optical components x-ray diffraction x-rays Synchrotrons Capillaries Device simulation Sensors

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Powerful scriptable ray tracing package xrt 3

Powerful scriptable ray tracing package xrt

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conference on advances in computational methods for x-ray optics III

作者： Klementiev, Konstantin Chernikov, Roman MAX IV Lab Ole Romers Vag 1 SE-22363 Lund Sweden DESY Photon Sci D-22607 Hamburg Germany

ISBN: (纸本)9781628412369

We present an open source python based ray tracing tool that offers several useful features in graphical presentation, material properties, advanced calculations of synchrotron sources, implementation of diffractive and refractive elements, complex (also closed) surfaces and multiprocessing. The package has many usage examples which are supplied together with the code and visualized on its web page. We exemplify the present version by modeling (i) a curved crystal analyzer, (ii) a quarter wave plate, (iii) Bragg-Fresnel optics and (iv) multiple reflective and non-sequential optics (polycapillary). The present version implements the use of OpenCL framework that executes calculations on both CPUs and GPUs. Currently, the calculations of an undulator source on a GPU show a gain of about two orders of magnitude in computing time. The development version is successful in modelling the wavefront propagation. Two examples of diffraction on a plane mirror and a plane blazed grating are given for a beam with a finite energy band.

关键词： x-ray optics simulation ray tracing synchrotron sources wave propagation computing on GPU

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x-ray optics simulation and beamline design using a hybrid method: diffraction-limited focusing mirrors 3

X-ray optics simulation and beamline design using a hybrid m...

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conference on advances in computational methods for x-ray optics III

作者： Shi, xianbo Reininger, Ruben del Rio, Manuel Sanchez Qian, Jun Assoufid, Lahsen Argonne Natl Lab Adv Photon Source Argonne IL 60439 USA European Synchrotron Radiat Facil F-38000 Grenoble France

ISBN: (纸本)9781628412369

A hybrid method combining ray-tracing and wavefront propagation was recently developed for x-ray optics simulation and beamline design optimization. One major application of the hybrid method is its ability to assess the effects of figure errors on the performance of focusing mirrors. In the present work, focusing profiles of mirrors with different figure errors are simulated using three available wave optics methods: the hybrid code based on the Fourier optics approach, the stationary phase approximation and a technique based on the direct Fresnel-Kirchhoff diffraction integral. The advantages and limitations of each wave optics method are discussed. We also present simulations performed using the figure errors of an elliptical cylinder mirror measured at APS using microstitching interferometry. These results show that the hybrid method provides accurate and quick evaluation of the expected mirror performance making it a useful tool for designing diffraction-limited focusing beamlines.

关键词： hybrid method Fresnel-Kirchhoff diffration integral stationary phase approximation diffraction-limited focus mirror figure error ray-tracing wavefront propagation

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Partially-coherent wavefront propagation simulations for inelastic x-ray scattering beamline including crystal optics 3

Partially-coherent wavefront propagation simulations for ine...

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conference on advances in computational methods for x-ray optics III

作者： Suvorov, Alexey Cai, Yong Q. Sutter, John P. Chubar, Oleg Brookhaven Natl Lab Photon Sci Directorate Upton NY 11973 USA Diamond Light Source Ltd Harwell Sci Didcot OX11 0DE Oxon England

ISBN: (纸本)9781628412369

Up to now simulation of perfect crystal optics in the "Synchrotron Radiation Workshop" (SRW) wave-optics computer code was not available, thus hindering the accurate modelling of synchrotron radiation beamlines containing optical components with multiple-crystal arrangements, such as double-crystal monochromators and high-energy-resolution monochromators. A new module has been developed for SRW for calculating dynamical diffraction from a perfect crystal in the Bragg case. We demonstrate its successful application to the modelling of partially-coherent undulator radiation propagating through the Inelastic x-ray Scattering (IxS) beamline of the National Synchrotron Light Source II (NSLS-II) at Brookhaven National Laboratory. The IxS beamline contains a double-crystal and a multiple-crystal high-energy-resolution monochromator, as well as complex optics such as compound refractive lenses and Kirkpatrick-Baez mirrors for the x-ray beam transport and shaping, which makes it an excellent case for benchmarking the new functionalities of the updated SRW codes. As a photon-hungry experimental technique, this case study for the IxS beamline is particularly valuable as it provides an accurate evaluation of the photon flux at the sample position, using the most advanced simulation methods and taking into account parameters of the electron beam, details of undulator source, and the crystal optics.

关键词： x-ray optics wave-optics propagation x-ray diffraction SRW

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Simulation of the ultrahigh energy resolution IxS analyzer system at NSLS-II 3

Simulation of the ultrahigh energy resolution IXS analyzer s...

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conference on advances in computational methods for x-ray optics III

作者： Suvorov, Alexey Coburn, David S. Cunsolo, Alessandro Keister, Jeffrey W. Cai, Yong Q. Brookhaven Natl Lab Photon Sci Directorate Upton NY 11973 USA

ISBN: (纸本)9781628412369

The ultrahigh energy resolution IxS spectrometer being developed at the National Synchrotron Light Source II (NSLS-II) employs an innovative optical design. Its analyzer system utilizes an L-shaped laterally graded multilayer mirror in tandem with a multi-crystal arrangement. The multi-crystal arrangement explores the angular dispersion effect in extremely asymmetric Bragg reflections to achieve sub-meV energy resolution at an energy about 9.1 keV. Its angular acceptance (similar to 0.1 mrad) is about two orders of magnitude lower than the spherically-bent backscattering analyzers conventionally used in other IxS spectrometers. The L-shaped laterally graded multiplayer mirror was designed to increase the angular acceptance of this new multi-crystal optics to a comparable level. It performs angular collimation of the incoming beam from about 15 mrad down to 0.1 mrad in both vertical and horizontal directions. Here we present simulations of the mirror performance and study the positioning and stability requirements in conjunction with the multi-crystal energy analyzer.

关键词： x-ray optics x-ray diffraction multilayer mirror inelastic x-ray scattering

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Partial Coherence and Imperfect optics at a Synchrotron Radiation Source Modeled by Wavefront Propagation 3

Partial Coherence and Imperfect Optics at a Synchrotron Radi...

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conference on advances in computational methods for x-ray optics III

作者： Laundy, David Alcock, Simon G. Alianelli, Lucia Sutter, John P. Sawhney, Kawal J. S. Chubar, Oleg Diamond Light Source Harwell Sci & Innovat Campus Didcot OX11 0DE Oxon England Brookhaven Natl Lab Photon Sci Directorate Upton NY 11973 USA

ISBN: (纸本)9781628412369

A full wave propagation of x-rays from source to sample at a storage ring beamline requires simulation of the electron beam source and optical elements in the beamline. The finite emittance source causes the appearance of partial coherence in the wave field. Consequently, the wavefront cannot be treated exactly with fully coherent wave propagation or fully incoherent ray tracing. We have used the wavefront code Synchrotron Radiation Workshop (SRW) to perform partially coherent wavefront propagation using a parallel computing cluster at the Diamond Light Source. Measured mirror profiles have been used to correct the wavefront for surface errors.

关键词： Synchrotron radiation modeling

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The finite-difference simulation of x-rays propagation through a system of lenses 3

The finite-difference simulation of X-rays propagation throu...

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conference on advances in computational methods for x-ray optics III

作者： Kshevetskii, Sergey P. Wojda, Pawel E. Balt I Kant Fed Univ Kaliningrad Russia Gdansk Techol Univ Gdansk Poland

ISBN: (纸本)9781628412369

The propagation of x-ray waves through an optical system consisting of 33 aluminum x-ray refractive lenses is considered. For solving the problem, a finite-difference method is suggested and investigated. It is shown that very small steps of the difference grid are necessary for reliable computation of propagation of x-ray waves through the system of lenses. It is shown that the wave phase is a function very quickly increasing with distance from an optical axis, after the wave has propagated through the system of lenses. If the phase is a quickly increasing function, then the wave electric field is a quickly oscillating function. We suggest and recommend using the equation for a phase function instead of the equation for an electric field. The equation for a phase function is derived.

关键词： x-ray wave x-ray optic lens non-un-form medium focusing numerical method simulation finite-difference stabilirty numerical error wave phase

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Developments of x-ray grating imaging and trying of multiple information fusion 3

Developments of X-ray grating imaging and trying of multiple...

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conference on advances in computational methods for x-ray optics III

作者： Han, Yueping Li, Ruihong Jiang, xiaolei North Univ China Natl Key Lab Elect Measurement Technol Taiyuan 0300511 Peoples R China North Univ China Minist Educ Key Lab Instrumentat Sci & Dynam Measurement Taiyuan 030051 Peoples R China Tsinghua Univ Minist Educ Key Lab Particle & Radiat Imaging Beijing 100084 Peoples R China

ISBN: (纸本)9781628412369

The present paper reviews the x-ray grating imaging systems at home and abroad from the aspects of technological characterizations and the newest researching focus. First, not only the imaging principles and the frameworks of the typical x-ray grating imaging system based on Talbot-Lau interferometry method, but also the algorithms of retrieving the signals of attenuation, refraction and small-angle scattering are introduced. Second, the system optimizing methods are discussed, which involves mainly the relaxing the requirement of high positioning resolution and strict circumstances for gratings and designing large field of view with high resolution. Third, two and four-dimensional grating-based x-ray imaging techniques are introduced. Moreover, the trends of x-ray grating based imaging technology are discussed, especially the multiple information fusions are tried with attenuation, refraction and scattering obtained synchronously.

关键词： x-ray grating imaging talbot interferometry research development

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computational techniques in propagation-based x-ray phase imaging 3

Computational techniques in propagation-based x-ray phase im...

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conference on advances in computational methods for x-ray optics III

作者： Petruccelli, Jonathan C. Tahir, Sajjad Bashir, Sajid Pan, Adam Tian, Lei xu, Ling MacDonald, C. A. Barbastathis, George SUNY Albany Dept Phys 1400 Washington Ave Albany NY 12222 USA MIT Dept Mech Engn Cambridge MA 02139 USA Univ Calif Berkeley Dept Elect Engn & Comp Sci Berkeley CA 94720 USA Shanghai Jiao Tong Univ Univ Michigan Joint Inst Shanghai 200240 Peoples R China Singapor MIT Alliance Res & Technol SMART cTR Singapore 138602 Singapore

ISBN: (纸本)9781628412369

x-ray phase imaging utilizes a variety of techniques to render phase information as intensity contrast and these intensity images can in some cases be processed to retrieve quantitative phase. A subset of these techniques use free space propagation to generate phase contrast and phase can be recovered by inverting differential equations governing propagation. Two techniques to generate quantitative phase reconstructions from a single phase contrast image are described in detail, along with regularization techniques to reduce the influence of noise. Lastly, a recently developed technique utilizing a binary amplitude grid to enhance signal strength in propagation based techniques is described.

关键词： Phase retrieval transport of intensity x-ray imaging grid based phase imaging partial coherence polycapillary optics

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3D x-ray reconstruction using lightfield imaging 3

3D x-ray reconstruction using lightfield imaging

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conference on advances in computational methods for x-ray optics III

作者： Saha, Sajib Tahtali, Murat Lambert, Andrew Pickering, Mark UNSW Canberra Sch Engn & Informat Technol Canberra ACT Australia

ISBN: (纸本)9781628412369

Existing Computed Tomography (CT) systems require full 360. rotation projections. Using the principles of lightfield imaging, only 4 projections under ideal conditions can be sufficient when the object is illuminated with multiple-point x-ray sources. The concept was presented in a previous work with synthetically sampled data from a synthetic phantom. Application to real data requires precise calibration of the physical set up. This current work presents the calibration procedures along with experimental findings for the reconstruction of a physical 3D phantom consisting of simple geometric shapes. The crucial part of this process is to determine the effective distances of the x-ray paths, which are not possible or very difficult by direct measurements. Instead, they are calculated by tracking the positions of fiducial markers under prescribed source and object movements. Iterative algorithms are used for the reconstruction. Customized backprojection is used to ensure better initial guess for the iterative algorithms to start with.

关键词： Computed tomography x-ray CT algebraic reconstruction technique ART compressed sensing iterative reconstruction

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