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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1-10 订阅

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Proceedings of SPIE: advances in computational methods for x-ray and neutron optics

Proceedings of SPIE: Advances in Computational Methods for X...

引用

advances in computational methods for x-ray and neutron optics

The proceedings contain 20 papers from the Proceedings of SPIE: advances in computational methods for x-ray and neutron optics. The topics discussed include: feasibility study of a laue lens for hard x rays for space astronomy;global optimization of x-ray multilayer mirrors with iterated simplex method;a ray-tracing code for zone plates;fitting x-ray multilayer reflectivities by means of the PPM code;simulation of polycapillary lenses for coherent and partially coherent x rays;genetic algorithm optimization of x-ray multilayer coatings;neutron ray-tracing simulations and data analysis with RESTRAx;and ray-tracing code for x-ray telescope performance prediction.

关键词： x ray optics

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neutron optics calculations with NOP

Neutron optics calculations with NOP

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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

The neutron optics Package NOP is a collection of codes for the computation of reactor spectra, neutron reflectivity of crystals, mirrors and multilayers and other quantities as cross-sections, attenuation in materials and refractive index. These calculations rely on the use of a database of materials cross-sections and crystal structures. NOP is freely distributed as an extension of the x-ray package xOP [M. Sanchez del Rio and R.J. Dejus, SPIE proceedings 3448, 340, 1998.], from which it inherites the user interface and code structure. The NOP package can be used for estimating the reflectivity of optical elements as crystals and multilayers. The NOP output can also be used as an input for neutron instrument ray-tracing modules.

关键词： neutron optics software multilayer and crystal reflectivity

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A simple formula to calculate the x-ray flux after a double-crystal monochromator

A simple formula to calculate the x-ray flux after a double-...

引用

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

作者： del Río, MS Mathon, O ESRF F-38043 Grenoble France

We present a very simple formula for calculating the total number of photons of an x-ray beam after being monochromatized by a double crystal monochromator. This is a typical case for most synchrotron radiation beamli... 详细信息

ISBN: (纸本)0819454745

关键词： synchrotron double-crystal monochromator flux ray tracing

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A raytracing code for zone plates

A raytracing code for zone plates

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

作者： Erko, A Schaefers, F Artemiev, N BESSY GmbH D-12489 Berlin Germany

ISBN: (纸本)0819454745

A raytracing code for zone plates incorporated in the BESSY raytracing program ray is described. This option allows one to calculate intensity distributions in a focal plane of circular or linear zone plates considering diffraction limited resolution. Zone plate material properties are also taking into account using optical constants data tables. The complete code is available as PC-Windows version.

关键词： raytracing x-ray optics zone plates

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Status of xOP:: an x-ray optics software toolkit

Status of XOP:: an x-ray optics software toolkit

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

作者： del Río, MS Dejus, RJ European Synchrotron Radiat Facil F-38043 Grenoble France

ISBN: (纸本)0819454745

xOP is a user-friendly computer environment for performing calculations of interest to the synchrotron radiation community. It provides codes for: i) modeling x-ray sources (e.g., synchrotron sources, such as undulators and wigglers), ii) calculating characteristics of optical elements (mirrors, filters, crystals, multilayers, etc.), and iii) multipurpose data visualization and analyses. The xOP functionality can be extended with external plug-ins (extensions). We describe the status of xOP including recent developments in the current version (xOP 2.11). Plans for the future will also be presented.

关键词： synchrotron radiation insertion device optics modeling x-ray optics database graphical user interface

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

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

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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...

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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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