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

共 109 条记录，以下是1-10 订阅

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Multilayer coating design methods for a high-energy x-ray imaging optic with complex design requirements 27

Multilayer coating design methods for a high-energy x-ray im...

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conference on advances in x-ray/EUV optics and Components xVII

作者： Walton, Chris C. Kozioziemski, Bernard Fein, Jeffrey R. Romaine, Suzanne E. Vogel, Julia K. Lawrence Livermore Natl Lab Livermore CA 94550 USA Sandia Natl Labs Albuquerque NM 87185 USA Harvard & Smithsonian Ctr Astrophys Cambridge MA 02138 USA Univ Zaragoza Dept Theoret Phys Zaragoza Spain

ISBN: (纸本)9781510654655;9781510654648

Imaging of x-rays with energies >15 keV is a necessity for several applications in high-energy density physics experiments. Multilayer-coated, Wolter-type glancing-incidence optics offer higher collection efficiency than pinhole cameras or Kirkpatrick-Baez style mirrors, and can achieve spatial resolution of 10-100um over 1-8 mm fields of view with throughput similar to 1-10%. Designing the multilayer coating is a complex optimization problem, involving multiple tradeoffs. A narrow energy bandwidth (similar to 1keV) is desirable to exclude background, but a broad angular acceptance is desirable for the optic to image a large field (similar to 1-8 mm). A Wolter optic's net reflectivity is two-bounce R-2 = R-1*R-2 for a wide range of pairs of incidence angles theta(1), theta(2). In addition, the multilayer coating can be modified in several ways, such as varying the period thickness through the stack, and along the length of the optic. Parallelized searches using ordinary gradient-descent and Markov-Chain Monte Carlo (MCMC) have been applied to design an optic to image Z-pinch plasmas on the Z Machine at Sandia National Laboratories. methods are tested to design an appropriate cost function for this search, and to reduce computational cost to search the parameter space efficiently.

关键词： x-ray optics multilayer coatings plasma diagnostics high energy density optimization

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Recent developments in x-ray lens modelling with SRW 5

Recent developments in X-ray lens modelling with SRW

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

作者： Celestre, Rafael Chubar, Oleg Roth, Thomas del Rio, Manuel Sanchez Barrett, raymond ESRF European Synchrotron 71 Ave Martyrs F-38000 Grenoble France Brookhaven Natl Lab Natl Synchrotron Light Source 2 Upton NY 11973 USA

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

The advent of 4th generation high-energy synchrotron facilities (ESRF-EBS and the planned APS-U, PETRA-iv and SPring-8 II) and free-electron lasers (Eu-xFEL and LCLS-II) allied with the recent demonstration of high-quality free-form refractive optics for beam shaping and optical correction have revived interest in compound refractive lenses (CRLs) as optics for beam transport, probe formation in x-ray micro- and nano-analysis as well as for imaging applications. Ideal CRLs have long been made available in the 'Synchrotron Radiation Workshop' (SRW), however, the current context requires more sophisticated modelling of x-ray lenses. In this work, we revisit the already implemented wave-optics model for an ideal x-ray lens in the projection approximation and propose modifications to it as to allow more degrees of freedom to both the front and back surfaces independently, which enables to reproduce misalignments and manufacturing errors commonly found in x-ray lenses. For the cases where simply tilting and transversely offsetting the parabolic sections of a CRL is not enough, we present the possibility of generating the figure errors by using Zernike and Legendre polynomials or directly adding metrology data to the lenses. We present the effects of each new degree of freedom by calculating their impact on point spread function and the beam caustics.

关键词： x-ray optics CRL x-ray lens optical modelling physical optics SRW

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Perturbation perspective of partial coherence discussion on imperfect x-ray optical elements 5

Perturbation perspective of partial coherence discussion on ...

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

作者： Hu, Lingfei Sutter, John P. Wang, Hongchang Sawhney, Kawal Diamond Light Source Ltd Harwell Sci & Innovat Campus Didcot OX11 0DE Oxon England

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

The rapid development of new-generation synchrotron facilities with excellent coherence demands more accurate evaluation of beamline performance. A perturbation theory based on wave optics is proposed in this work to describe the effect of imperfections on the performance of x-ray optical elements. It shows that the perturbed performance of the non-ideal optical element could be derived from the perfect performance of the ideal optic through a convolution operation. The semi-analytical approach proposed here provides a new way to improve the simulation efficiency for imperfect optical elements. The finite aperture effect on diffraction-limited optics and focal shape distortion by surface height error are treated to show the application of the proposed method.

关键词： ray optics wave optics partial coherence wavefront propagation beamline design

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WISER wavefront propagation simulation code: advances and Applications 5

WISER wavefront propagation simulation code: Advances and Ap...

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

作者： Manfredda, M. Hafner, A. Gerusina, S. Mahne, N. Simoncig, A. Zangrando, M. Raimondi, L. Elettra Sincrotrone Trieste SCpA SS 14Km 163-5 I-34149 Basovizza TS Italy CERIC ERIC SS 14Km 163-5 I-34149 Basovizza TS Italy CNR IOM Ist Officina Mat SS 14Km 163-5 I-34149 Basovizza TS Italy

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

In this work, we report the advances in the development of WISER. WISER is a wave optics-based simulation library targeted at the simulation of the focusing performance of grazing x-ray optics systems, which accounts for the metrological data of figure error and roughness power spectral density. First presented in 2016 (phase-I), WISER inherits and expands the mathematical concepts of its ancestor, WISE, originally conceived for x-ray telescopes and then applied to free electron lasers. Thanks to its flexible framework, WISER easily allowed to simulate multi-element systems, as synchrotron and free electron laser beamlines. In phase-II (2020), WISER is further improved and it is delivered as fully integrable with OASYS, the graphical canvas gathering the mostly used x-ray computation tools. In the following, we will illustrate the architecture of the library and present some examples of its applications.

关键词： optics simulation x-ray oasys wiser metrology

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Beam-shaping elements based on x-ray refractive optics: theory, modeling, and experiment 5

Beam-shaping elements based on X-ray refractive optics: theo...

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

作者： Zverev, D. Snigireva, I Snigirev, A. Immanuel Kant Baltic Fed Univ Nevskogo 14 Kaliningrad 236041 Russia European Synchrotron Radiat Facil 71 Ave Martyrs F-38043 Grenoble France

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

The optical system consisting of an x-ray parabolic axicon and traditional parabolic refractive lenses is considered. Such lenses combination makes it possible to flexibly adjust the size of the focused ring-shaped beam produced by axicon changing the number of the parabolic lenses in the optical system. The optical properties of the presented beam-shaping lens have been studied theoretically and experimentally tested. Based on the complex optical function of the lens a new approach to the phase-contrast imaging which takes advantage of the traditional x-ray microscopy and the unique optical properties of the parabolic refractive axicon was presented. Additionally, the computer simulation approach based on a Fast Fourier Transform wave optics computation was described as well as the corresponded numerical calculations of the considered optical transformations were performed. The simulation results are in good agreement with experimental ones.

关键词： x-ray beam-shaping refractive optics parabolic axicon lens phase-contrast microscopy coherent x-ray radiation synchrotron x-ray free electron laser (xFEL)

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Analytical expressions of the surface shape of 'diaboloid' mirrors 5

Analytical expressions of the surface shape of 'diaboloid' m...

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

作者： Yashchuk, Valeriy V. Lacey, Ian del Rio, Manuel Sanchez Lawrence Berkeley Natl Lab Adv Light Source 1 Cyclotron Rd Berkeley CA 94720 USA ESRF 71 Ave Martyrs F-38043 Grenoble France

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

Modern deterministic polishing processes allow fabrication of x-ray optics with almost any arbitrary aspherical surface shape. Among these optics, the so called "diaboloid" mirror is of special interest. The diaboloid mirror that converts a cylindrical wave to a spherical wave would improve focusing in x-ray beamlines implementing a diffraction element between a parabolic cylinder and a toroidal mirror. The replacement of the toroidal mirror in existing beamlines by the diaboloid mirror would mitigate aberrations. The shape of the diaboloid mirror is usually calculated numerically based on a truncated polynomial solution of the optical path problem. Here, we present an exact analytical solution for the shape of a diaboloid mirror as a function of the conjugate parameters of the mirror placed in a beamline. The derived analytical expressions for the diaboloid mirror in both the canonical and mirror-based coordinate systems are implemented in ray-tracing simulations to verify the beamline performances.

关键词： synchrotron radiation x-ray optics diaboloid mirror analytical solution aspherical optics aberrations monochromator spectral resolution

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x-ray forward diffraction wave-front propagation in Si and C single crystals: Simulations and experiments 5

X-ray forward diffraction wave-front propagation in Si and C...

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

作者： Rodriguez-Fernandez, A. Carbone, G. Matej, Z. Grolimund, D. Sanchez, D. F. Pedrini, B. European XFEL GmbH Holzkoppel 4 DE-22869 Schenefeld Germany Lund Univ Max Lab 4 Fotongatan 2 SE-22100 Lund Sweden Paul Scherrer Inst Forsch Str 111 CH-5232 Villigen Switzerland

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

The emergence of new high brilliance and high coherence facilities such as x-ray Free Electron Lasers (xFELs) and 4th generation synchrotrons open a new era in x-ray optics. Dynamical diffraction effects before disregarded are starting to play a role in the beam control of large scale facilities. In the case of xFEL facilities the temporal characteristics of the dynamical diffraction by thin perfect crystals can be used as a tool to generate femtosecond monochromatic pulses, in the case of self-seeding in the hard x-ray regime, but could even be used as method to characterize materials in this temporal range. In this contribution we present the first steps in the understanding of the spatial-displacement dependence of forward beams diffracted by thin crystals. The data collected by this technique is compared with crystal models based in dynamical diffraction theory. This type of study could open a new field to understand low strain materials in the femtosecond regime.

关键词： Dynamical Diffraction theory Forward diffraction x-ray thin optics

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Reduced model representation of x-ray transport suitable for beamline control 5

Reduced model representation of x-ray transport suitable for...

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

作者： Nash, B. Goldring, N. Edelen, J. Federer, C. Moeller, P. RadiaSoft LLC Boulder CO 80301 USA

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

We describe a reduced model approach to x-ray transport down synchrotron radiation beamlines. The method uses a ray tracing code for computation of a transfer matrix for sections including drift spaces and focusing elements separated by physical apertures. The transport matrix along the beamline is analyzed analogously to charged particle beam optics. For coherent radiation, the wavefront is propagated by the transport matrix via linear canonical transformation. For the partially coherent case, the matrix can be applied directly to the Wigner function. We apply this method to a beamline section comprised of a KB focusing system and compare results between Synchrotron Radiation Workshop and SHADOW. Machine learning methods are also used for 2-D automated alignment. Plans for use of the reduced model within a beamline control system and more advanced used of machine learning methods for automation and reconfiguration are discussed.

关键词： Synchrotron radiation Wigner function linear canonical transform beamline modelling machine learning SHADOW SRW SIREPO

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Simulations of coherent scattering experiments at storage ring synchrotron radiation sources in the hard x-ray range 5

Simulations of coherent scattering experiments at storage ri...

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

作者： Chubar, Oleg Coles, Rebecca Wiegart, Lutz Fluerasu, Andrei Rakitin, Maksim Condie, James Moeller, Paul Nagler, Robert Brookhaven Natl Lab Natl Synchrotron Light Source 2 Upton NY 11973 USA Univ Nevada Reno NV 89557 USA RadiaSoft LLC 3380 Mitchell Lane Boulder CO 80301 USA

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

Detailed simulations of experiments carried out at modern light sources are directly related to the most efficient and productive use of these facilities for research in multiple branches of science and technology. The "Synchrotron Radiation Workshop" computer code with its Python interface, and Sirepo web-browser-based graphical user interface, currently supports physical optics simulations of coherent x-ray scattering and imaging experiments on user-defined virtual samples. We present examples of simulations of coherent scattering experiments that are typically performed at the Coherent Hard x-ray beamline at Brookhaven National Laboratory's (BNL) National Synchrotron Light Source II. We also present several comparisons of the simulations with the results of actual coherent x-ray scattering experiments with nano-fabricated test samples produced at BNL's Center for Functional Nanomaterials.

关键词： synchrotron radiation light sources experiments coherent x-ray scattering simulation

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Wave optics simulations for new soft x-ray beamlines at NSLS-II 5

Wave optics simulations for new soft X-ray beamlines at NSLS...

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

作者： He, A. Chubar, O. Dvorak, J. Hu, W. Hulbert, S. Walter, A. Wilkins, S. Salort, C. Brookhaven Natl Lab Natl Synchrotron Light Source 2 Upton NY 11973 USA Univ Puerto Rico Rio Piedras Campus Rio Piedras PR 00931 USA

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

We performed fully- and partially-coherent synchrotron emission and propagation simulations with the "Synchrotron Radiation Workshop" computer code to analyze the performance of two soft x-ray beamlines under development at the National Synchrotron Light Source II: Soft x- ray Nanoprobe (SxN), and Angle-Resolved Photoemission Spectroscopy (ARPES) and Resonant Inelastic x-ray Scattering (RIxS) Imaging (ARI). The SxN beamline intends to provide high flux and high spatial resolution coherent soft x-ray imaging capabilities using both zone plate and lensless coherent imaging techniques. The ARI beamline aims to perform high flux ARPES and RIxS experiments with a focal spot size at the sample approaching 100 nm using highly-demagnifying mirrors in Kirkpatrick-Baez geometry. To accurately calculate the resolution and the degree of x-ray coherence provided by the two state-of- the-art beamlines, partial coherence effects are required to be taken into account in wave optics simulations for these two beamlines. In this talk, beamline performance parameters such as spot size, degree of coherence, flux, and energy resolution at the sample are presented. The effects of mirror surface slope errors on beamline performance were studied and some suggestions for further optimization are discussed.

关键词： wave optics simulation partial coherence SxN ARPES RIxS ARI SRW Sirepo

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