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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101-110 订阅

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LEPTOS: A universal software for x-ray reflectivity and diffraction

LEPTOS: A universal software for X-ray reflectivity and diff...

引用

conference on advances in computational methods for x-ray and neutron optics

作者： Ulyanenkov, A Bruker AXS GmbH D-76187 Karlsruhe Germany

ISBN: (纸本)0819454745

LEPTOS is a software package for analytical interpretation of data obtained in glancing-incidence x-ray reflectivity and high-resolution x-ray diffraction experiments on thin film structures. The software is designed for comprehensive analysis of physical and crystallographic parameters of modern nanoscale layered structures. The interpretation is based on up-to-date dynamical diffraction approaches and most recent theories of interaction of x-rays with matter. The graphical user interface (GUI) is designed to conveniently work with experimental data, simulate x-ray scattering processes and automatically fit simulations to the measurements using a sample models.

关键词： x-ray reflectivity high-resolution x-ray diffraction data fitting thin film analysis

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neutron ray-tracing simulations and data analysis with RESTRAx

Neutron ray-tracing simulations and data analysis with RESTR...

引用

conference on advances in computational methods for x-ray and neutron optics

作者： Saroun, J Kulda, J Acad Sci Czech Republ Inst Nucl Phys Rez 25068 Czech Republic

ISBN: (纸本)0819454745

We review the methods of simulating the neutron optics of three-axis spectrometers to optimize their resolution and luminosity and to interpret experimental data collected with them. The program package RESTRAx includes both a high-speed analytical (Gaussian) convolution algorithm and a Monte Carlo ray-tracing code providing enhanced accuracy in description of most of the spectrometer components. The program is designed for a fixed spectrometer layout, with emphasis on the choice of a complete set of usual neutron optical devices and on their realistic representation. The fixed layout permits to generate a highly optimized Fortran code, producing sets of 10(3) - 10(4) successful events per second. This speed on the turn allows for a truly interactive work when designing a new instrument or refining a model describing the scattering behavior of a sample under investigation. As an illustration, we give several examples of TAS configurations, including high-luminosity focusing arrangements and multianalyzer setups as well a demonstration of the data fitting part of RESTRAx in the case of magnetic excitations.

关键词： neutron optics MC ray-tracing neutron inelastic scattering three-axis spectrometers data analysis

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Global optimization of x-ray multilayer mirrors with iterated simplex method

Global optimization of X-ray multilayer mirrors with iterate...

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conference on advances in computational methods for x-ray and neutron optics

作者： Cotroneo, V Pareschi, G Osserv Astron Brera INAF I-23807 Merate Lc Italy

ISBN: (纸本)0819454745

x rays focusing telescopes, composed of several Wolter I nested mirror shells reflecting at grazing incidence, are commonly employed only in the soft x-rays band (below 10 keV). At higher energies only direct view detectors (with low or not at all imaging capabilities) have been operative so far. The use of multilayer coatings on Wolter I mirrors can be a suitable way to realize focusing optics operating at higher energies (10 - 100 keV). A procedure based on an iterated simplex numerical method has been developed in order to get a global optimization of the multilayer reflectors sequences that will be applied for this kind of hard x-ray focusing telescopes. In particular, the specific case of the multilayer optimization for the optics of some future x-ray missions has been investigated.

关键词： x-ray astronomical instrumentation x-ray astronomical optics hard and soft x-ray multilayer mirrors numerical optimization techniques

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ray tracing code for x-ray telescope performance prediction

Ray tracing code for X-ray telescope performance prediction

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conference on advances in computational methods for x-ray and neutron optics

作者： Parodi, G BCV Progretti Srl I-20123 Milan Italy

ISBN: (纸本)0819454745

Future x-ray missions plan to utilize grazing incidence optics with very large diameter, very low angular resolutions and very light structural masses. These extremely severe requirements make the structural numerical modelling an essential tool, in order to investigate the structural integrity and the distortions of the optics, in the different scenarios on ground and on orbit. The paper presents a ray tracing code, interfaced with general purpose finite element codes, able to predict the optical performances degradation coming from any sort of mirror distortion previously analysed by finite element approach. By the combination of the two tools, finite element analysis and ray tracing code, it becomes possible to simulate a very wide range of scenarios during the telescope design and optimization. The paper shows the main features of the ray tracing code, giving some examples taken from the most recent activities carried out for present and future x ray missions.

关键词： ray telescope Wolter 1 ray tracing finite element analyses

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Simulation of poly-capillary lenses for coherent and partially coherent x-rays

Simulation of poly-capillary lenses for coherent and partial...

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conference on advances in computational methods for x-ray and neutron optics

作者： Vincze, L Kukhlevsky, SV Janssens, K Univ Antwerp MITAC B-2610 Antwerp Belgium

ISBN: (纸本)0819454745

The intensity distributions of the coherent and partially coherent x-rays passed through a poly-capillary lens have been computed at the focal plane. The computations showed that at the appropriate experimental conditions the interference phenomenon does affect the intensity distribution. In the case of the coherent input radiation with the photon energy of 0.1 keV, the interference fringes were observed, while the non-coherent x-ray radiation produced no interference-like intensity distributions.

关键词： x-ray optics poly-capillary lenses coherent and partially coherent radiation

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I.: A Monte Carlo algorithm for the simulation of Bragg scattering by imperfect crystals.: II.: Application to mosaic copper

I.: A Monte Carlo algorithm for the simulation of Bragg scat...

引用

conference on advances in computational methods for x-ray and neutron optics

作者： Alianelli, L Del Río, MS Felici, R Ist Nazl Fis Mat Operat Grp Grenoble ESRF F-38043 Grenoble France

ISBN: (纸本)0819454745

We present a Monte-Carlo algorithm for the simulation of Bragg diffraction from imperfect crystals that are used for neutron analysers and monochromators. The algorithm is used in ray-tracing simulation of neutron instruments but can also be used for x-rays. This method performs a detailed description of the particle interaction with the microscopic regions composing the crystal. It computes important quantities that cannot be calculated with standard models, as the number of multiple scattering events, and diffraction topographs. We also discuss applications of this method to the analysis of x-ray data from mosaic copper crystals.

关键词： neutron instrumentation ray-tracing mosaic crystal monochromator

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x-ray server: an online resource for simulations of x-ray diffraction and scattering

X-ray server: an online resource for simulations of X-ray di...

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conference on advances in computational methods for x-ray and neutron optics

作者： Stepanov, S Argonne Natl Lab GM CA CAT Adv Photon Source Argonne IL 60439 USA

ISBN: (纸本)0819454745

x-ray Server is a public project operational at the APS since 1997 with the goals to explore novel network technologies for providing wide scientific community with access to personal research results, establishing scientific collaborations, and refining scientific software. The Server provides Web-based access to a number of programs developed by the author in the field of x-ray diffraction and scattering. The software code operates directly on the Server available for use without downloading. Currently seven programs are accessible that have been used more than 85,000 times. This report discusses the Server philosophy, provides an overview of the physical models and algorithms beneath the codes and demonstrates some applications of the programs. It is shown with examples and statistics how the Server goals are achieved. The plans for further x-ray Server development are outlined.

关键词： x-ray diffraction x-ray scattering x-ray optics x-ray theory web-based computations

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How to make x-ray simulation software working on WWW: A simple recipe based on seven years of experience

How to make X-ray simulation software working on WWW: A simp...

引用

conference on advances in computational methods for x-ray and neutron optics

作者： Stepanov, S Argonne Natl Lab Adv Photon Source GM CA CAT Argonne IL 60439 USA

ISBN: (纸本)0819454745

Attaching WWW interfaces to scientific software opens new opportunities to researchers by making their results available to wide scientific community in a way complimentary to publication. We have shown that this task may be much easier than many used to think: the amount of additional code is small, the Common Gateway Interface (CGI) can be written in any language, not necessarily PERL, and the software can be interfaced on any operating system it was originally written and does not have to be ported to UNIx. This paper provides some useful recipes resulted from seven years of author's experience in developing and maintaining highly successful x-ray Web server project. All these solutions are based on free public domain software (Apache, GnuPlot, and InfoZip) and applicable for multiple computer platforms. Some practical examples are provided.

关键词： x-ray diffraction x-ray scattering x-ray optics x-ray theory web-based computations

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Genetic algorithm optimization of x-ray multilayer coatings

Genetic algorithm optimization of X-ray multilayer coatings

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conference on advances in computational methods for x-ray and neutron optics

作者： Binda, PD Zocchi, FE Media Lario Srl I-23482 Bosisio Parini LC Italy

ISBN: (纸本)0819454745

A simple genetic algorithm for global optimisation of the reflectivity of multilayer coatings in the extreme ultra-violet and x-ray wavelength ranges has been implemented as a software tool. The genetic algorithm identifies the best-performing multilayer among a population of solutions that evolves while random mutations are applied to the thickness of the layers. The tool is designed for maximising the reflectivity either over a wavelength range at fixed incident angle or over a range of incident directions at fixed energy. The algorithm has been preliminarily tested on two specific applications: a Pt/C multilayer for hard x-rays applications in astrophysics and cosmology and a Mo/Si coating prominent to next generation lithography at 13.5 nm. The results of the analyses are compared to the performances achievable with periodic multilayers and traditional supermirrors.

关键词： genetic algorithm multilayer coating numerical optimisation reflectivity x-ray mirrors

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Feasibility study of a Laue lens for hard x-rays for space astronomy

Feasibility study of a Laue lens for hard X-rays for space a...

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conference on advances in computational methods for x-ray and neutron optics

作者： Pisa, A Frontera, F De Chiara, P Loffredo, G Pellicciotta, D Landini, G Franceschini, T Silvestri, S Andersen, K Courtois, P Hamelin, B Univ Ferrara Dept Phys I-44100 Ferrara Italy

ISBN: (纸本)0819454745

We report on the feasibility study of a Laue lens for hard x-rays (> 60 keV) based on mosaic crystals, for astrophysical applications. In particular we discuss the scientific motivations, its functioning principle, the procedure followed to select the suitable crystal materials, the criteria adopted to establish crystal dimensions and their distribution on the lens in order to obtain the best lens focusing capabilities, and the criteria for optimizing the lens effective area in a given passband. We also discuss the effects of misalignments of the crystal tiles due to unavoidable mechanical errors in assembling the lens. A software was developed to face all these topics and to evaluate the expected lens performance.

关键词： hard x-ray astronomy hard x-ray optics crystal diffraction

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