The proceedings contain 20 papers from the Proceedings of SPIE: advances in computationalmethods for x-ray and neutronoptics. The topics discussed include: feasibility study of a laue lens for hard xrays for space ...
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The proceedings contain 20 papers from the Proceedings of SPIE: advances in computationalmethods for x-ray and neutronoptics. The topics discussed include: feasibility study of a laue lens for hard xrays 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 xrays;genetic algorithm optimization of x-ray multilayer coatings;neutronray-tracing simulations and data analysis with RESTRAx;and ray-tracing code for x-ray telescope performance prediction.
The neutronoptics 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 material...
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ISBN:
(纸本)0819454745
The neutronoptics 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.
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...
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ISBN:
(纸本)0819454745
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 beamlines. The derivation of the formula and its numerical benchmarking by ray-tracing simulations are also presented.
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 consideri...
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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.
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 undulato...
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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.
We review the methods of simulating the neutronoptics of three-axis spectrometers to optimize their resolution and luminosity and to interpret experimental data collected with them. The program package RESTRAx includ...
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ISBN:
(纸本)0819454745
We review the methods of simulating the neutronoptics 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.
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 ...
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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.
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...
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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 xray missions.
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 condit...
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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.
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 sc...
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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.
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