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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11-20 订阅

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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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Bragg-case x-ray dynamical diffraction propagator in SRW: application to thin crystal phase retarders 5

Bragg-case X-ray dynamical diffraction propagator in SRW: ap...

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

作者： Sutter, John P. Chubar, Oleg Suvorov, Alexey Nelson, Christie Sawhney, Kawal Diamond Light Source Harwell Sci & Innovat Campus Didcot OX11 9RE Oxon England Brookhaven Natl Lab NSLS 2 743 Brookhaven AveBldg 743 Upton NY 11973 USA

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

A Bragg-case x-ray dynamical diffraction propagator has already been integrated into the "Synchrotron Radiation Workshop" (SRW) physical optics simulation software package. Previous benchmarking tests on crystal monochromators assumed thicknesses many times the extinction length, for which transmission is negligible. This paper reports tests of this propagator applied to thin crystals in transmission. The chosen example is a phase retarder, which allows users to alter the polarization of an x-ray beam. Phase retarders are often applied to studies of solid-state materials with hard x-rays, which current medium-energy storage ring synchrotron sources typically produce only with linear polarization. Correct designs of phase retarders require the accurate determination of both the intensity and the phase of the diffracted wave in all polarization states. First, to approximate an incident plane wave, SRW is used to simulate the passage of a Gaussian beam of very large radius of curvature through the phase retarder. Then, the phase retarder's effects on a typical undulator beam are simulated and the results are compared. Because x-ray phase retarders are highly sensitive to angular alignment, tolerances in misalignment are also determined. SRW simulations are compared with experimental data from the Integrated In Situ and Resonant Hard x-ray Studies (ISR) beamline at NSLS-II. The design of phase retarders can therefore be optimized for x-ray beamlines that must combine variable polarization with focusing or other properties.

关键词： SRW x-ray Bragg crystal phase retarder phase plate physical optics dynamical diffraction

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Analysis of hard x-ray focusing by 2D diamond CRL 5

Analysis of hard X-ray focusing by 2D diamond CRL

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

作者： Chubar, Oleg Wiegart, Lutz Antipov, Sergey Celestre, Rafael Coles, Rebecca Fluerasu, Andrei Rakitin, Maksim Brookhaven Natl Lab Natl Synchrotron Light Source 2 Upton NY 11973 USA Euclid Techlabs LLC Bolingbrook IL 60440 USA European Synchrotron Radiat Facil 71 Ave MartyrsCS 40220 F-38043 Grenoble 9 France

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

x-ray Compound Refractive Lenses (CRLs) made out of diamond have a number of attractive features for applications at modern light sources, such as relatively large refractive index decrement and yet relatively low absorption for hard xrays, low thermal expansion coefficient and high mechanical rigidity (allowing to safely use them as first optical elements of beamlines), and relatively low undesirable scattering from their volume. However, diamond CRLs are hard to fabricate and process to a (sub-)micron accuracy of the surface shape, required for aberration-free focusing of hard xrays. We will report on results of experimental tests of first generation 2D diamond CRLs manufactured by Euclid Techlabs LLC. The tests were performed at the Coherent Hard x-ray beamline of the National Synchrotron Light Source II, and included measurements of intensity profiles of similar to 13 keV undulator radiation focused by one diamond lens in a low-demagnification geometry. Such geometry is typically used for the x-ray beam transport and can be used for the imaging-based diagnostics of the emitting electron beam. The quality of x-ray focusing with the new diamond CRL was analyzed by comparing the measurement results with partially-coherent wave-optics simulations performed with Synchrotron Radiation Workshop code. The tests of the diamond CRL also included measurements of small-angle x-ray scattering produced by it, and comparison of these data with the scattering data from a beryllium CRL with the same focal length.

关键词： synchrotron radiation light sources diamond CRL x-ray focusing

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Theoretical analysis and development of high efficiency tender x-ray multilayer coated gratings 5

Theoretical analysis and development of high efficiency tend...

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

作者： Zhuang, Yeqi Huang, Qiushi Kozhevnikov, Igor, V Feng, Jiangtao Qi, Runze Sokolov, Andrey Senf, Friedmar Zhang, Zhong Wang, Zhanshan Tongji Univ Sch Phys Sci & Engn Inst Precis Opt Engn Key Lab Adv Microstruct MatMOE Shanghai 200092 Peoples R China Russian Acad Sci Shubnikov Inst Crystallog Fed Sci Res Ctr Crystal Leninskiy Pr 59 Moscow 119333 Russia Helmholtz Zentrum Berlin Mat & Energie BESSY II Albert Einstein Str 15 D-12489 Berlin Germany

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

The low efficiency of conventional single layer gratings at the tender x-ray region (E=1 similar to 5 keV) significantly limits the photon flux of the beamline and the development of related imaging and spectroscopy experiments in this region. To overcome this issue, multilayer coated gratings have been proposed and developed. The diffraction behavior of a multilayer grating is more complex than a single layer grating. To understand the diffraction behavior and exert the maximum potential of this new optics, we have built an analytical theory based on coupled wave theory. A high efficiency single order diffraction regime was first identified which means only one diffraction order will be excited with a certain incidence angle and structure parameters. This is applicable to blazed multilayer gratings (BMGs). To achieve maximum efficiency, the optimum grating and multilayer structures were analyzed. The highest theoretical efficiency of a BMG can reach the same value of the coated multilayer reflectance. Moreover, blazed multilayer gratings exhibit the advantage of high harmonics suppression. For the BMG, the conventional condition of maximal diffraction efficiency, Dsin alpha = nd, where D and d is the grating period and multilayer period, respectively, alpha is blaze angle, n is diffraction order, has been proved invalid. This is due to the contribution of anti-blaze facets to diffraction and effect of strongly asymmetric diffraction. Based on these, a Cr/C BMG was fabricated in collaboration with the Department for Nanometer optics and Technology in BESSY-II. Maximum efficiency of up to 60% was demonstrated at 3 keV which is close to the theoretical prediction.

关键词： Diffraction gratings Multilayers Diffraction theory tender x-rays

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A software package named MOI is developed for calculating the mutual optical intensity propagation through beamline 5

A software package named MOI is developed for calculating th...

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

作者： Wang, Yong Meng, xiangyu Shi, xianbo Ren, Junchao Assoufid, Lahsen Tai, Renzhong Chinese Acad Sci Shanghai Adv Res Inst Shanghai 201210 Peoples R China Argonne Natl Lab Adv Photon Source 9700 S Cass Ave Argonne IL 60439 USA Chinese Acad Sci Shanghai Inst Appl Phys Shanghai Peoples R China

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

The mutual optical intensity (MOI) package is developed to simulate the mutual optical intensity propagation through beamline and is available online at ***. In this paper we describe the basic principles of the MOI package. The propagation of the mutual optical intensity is numerically carried out by dividing the wave plane into many small elements to meet the requirements of the Fraunhofer or the Fresnel approximations. From the mutual optical intensity, the intensity, the phase distribution and the coherence between any two points in a wave plane can be extracted. The in-plane wave vector distribution in the wave plane of partially coherent beam can be obtained by considering the phase distribution inside each element. The consideration of the in-plane wave vector provides both higher accuracy and higher efficiency, which is very important to the future development of the 2D MOI code. We demonstrate applications of the MOI package on propagation simulations of partially coherent beams in different optical setup, including the propagation through an elliptically cylinder mirror and a parabolically cylinder mirror. The dependence of the in-plane wavevector on the beam coherence is analyzed. Clear. shifts are seen in the in-plane wavevector profile and disappear with decreasing coherence. The knowledge of the in-plane wave vector gives detailed analysis of the beam wavefront. The calculation efficiency depends on the number of elements. The calculation speed for the mutual optical intensity propagation with 1000 elements through one optics is about 2.5 seconds.

关键词： beamline partially coherent x-ray mutual optical intensity wavevector simulation software package

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Flexible optical layouts based on cylindrical mirrors with sagittal curvature for high-stability beamlines 5

Flexible optical layouts based on cylindrical mirrors with s...

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

作者： Luiz, Sergio A. L. Pinto, Artur C. Junior, Humberto R. Meyer, Bernd C. Zeri, Ana C. Meneau, Florian Malfatti-Gasperini, Antonio A. Soares, Marcio M. Calligaris, Guilherme A. Candido, Luciano B. Westfahl Jr, Harry Brazilian Ctr Res Energy & Mat CNPEM Brazilian Synchrotron Light Lab LNLS Rua Giuseppe Maximo Scolfaro 1000 BR-13083970 Campinas Brazil Univ Fed Paraiba Dept Fis BR-58051970 Joao Pessoa Paraiba Brazil

ISBN: (数字)9781510637931

ISBN: (纸本)9781510637931;9781510637924

Cylindrical mirrors with sagittal curvature are known for non-ideal focusing due to strong aberrations. However, the small emittance of undulator sources at new upcoming fourth-generation synchrotrons causes the footprint of the beam on a sagittal cylinder to be small enough to permit almost aberration-free focusing. The use of side deflecting sagittal cylinders in the optical design of synchrotron beamlines brings advantages to the beam performance: a) it improves stability, because horizontal plane is less affected by ground vibrations, b) it keeps the beam height with respect to the floor, c) the beam is less sensitive to slope errors in the sagittal plane. Furthermore, a sagittal cylinder in combination with a meridional cylinder or ellipse allows the change of focal spot size and position. In this work, we present the optical scheme of three beamlines including sagittal cylinders for the fourth-generation synchrotron SIRIUS. In MANACA beamline (protein crystallography) a sagittal cylinder and a meridional ellipse face each other in the horizontal plane. By changing the incidence angle of both mirrors in the same direction beam size at sample can be changed from 10 to 100 mu m. In SAGUI beamline (SAxS and xRD) both mirrors face the same direction. Changing the incidence angle in opposite direction enables to change the focus position by tens of meters. In CATERETE beamline (Coherent Diffraction Imaging) the two mirrors face each other to create a highly coherent plane wave with a focal spot of 40 mu m. We compare the performance of each beamline with their ideal optics counterpart, using wave propagation simulations (SRW).

关键词： x-ray optics sagittal cylindrical mirror wave propagation stability

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Effect of x-ray mirror figure error on the focus profile - comparison of measurements with physical and geometric optics simulations 4

Effect of X-ray mirror figure error on the focus profile - c...

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

作者： Laundy, David Sawhney, Kawal Diamond Light Source Harwell Sci & Innovat Campus Didcot OX11 0DE Oxon England

ISBN: (数字)9781510612341

ISBN: (纸本)9781510612341;9781510612334

Mirrors operating at grazing angles utilising total external reflection are commonly used for focusing x-ray at synchrotron radiation sources. Figure error on the mirror causes distortion of the focus profile. We have modeled a well characterized test mirror which has three different modifications of the elliptical figure laid down in parallel lanes running the length of the mirror. The focusing of the mirror was simulated using geometric optics (ray tracing) and physical optics (wave propagation). The mirror was then tested with x-rays on a beamline at a synchrotron radiation facility. The comparison between the two simulation methods and the measured data elucidates the origins of structures on the intensity profile of the focused beam and demonstrate that for quantitative agreement between simulation and experiment, interference and diffraction effects must be modeled.

关键词： Synchrotron radiation modeling geometric optics physical optics x-ray mirror focusing

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Speckle-based at-wavelength metrology of x-ray optics at Diamond Light Source 4

Speckle-based at-wavelength metrology of X-ray optics at Dia...

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

作者： Wang, Hongchang Zhou, Tunhe Kashyap, Yogesh Sawhney, Kawal Diamond Light Source Ltd Harwell Sci & Innovat Campus Didcot OX11 0DE Oxon England Bhabha Atom Res Ctr Tech Phys Div Bombay 400085 Maharashtra India

ISBN: (数字)9781510612341

ISBN: (纸本)9781510612341;9781510612334

To achieve high resolution and sensitivity on the nanometer scale, further development of x-ray optics is required. Although ex-situ metrology provides valuable information about x-ray optics, the ultimate performance of x-ray optics is critically dependent on the exact nature of the working conditions. Therefore, it is equally important to perform in-situ metrology at the optics' operating wavelength ('at-wavelength' metrology) to optimize the performance of x-ray optics and correct and minimize the collective distortions of the upstream beamline optics, e.g. monochromator, windows, etc. Speckle-based technique has been implemented and further improved at Diamond Light Source. We have demonstrated that the angular sensitivity for measuring the slope error of an optical surface can reach an accuracy of two nanoradians. The recent development of the speckle-based at-wavelength metrology techniques will be presented. Representative examples of the applications of the speckle-based technique will also be given - including optimization of x-ray mirrors and characterization of compound refraction lenses. Such a high-precision metrology technique will be extremely beneficial for the manufacture and in-situ alignment/optimization of x-ray mirrors for next-generation synchrotron beamlines.

关键词： Metrology at-wavelength in-situ characterization near-field speckle synchrotron radiation

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x-ray optics simulation and beamline design for the APS upgrade 4

X-ray optics simulation and beamline design for the APS upgr...

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

作者： Shi, xianbo Reininger, Ruben Harder, Ross Haeffner, Dean Argonne Natl Lab Adv Photon Source Argonne IL 60439 USA

ISBN: (数字)9781510612341

ISBN: (纸本)9781510612341;9781510612334

The upgrade of the Advanced Photon Source (APS) to a Multi-Bend Achromat (MBA) will increase the brightness of the APS by between two and three orders of magnitude. The APS upgrade (APS-U) project includes a list of feature beamlines that will take full advantage of the new machine. Many of the existing beamlines will be also upgraded to profit from this significant machine enhancement. optics simulations are essential in the design and optimization of these new and existing beamlines. In this contribution, the simulation tools used and developed at APS, ranging from analytical to numerical methods, are summarized. Three general optical layouts are compared in terms of their coherence control and focusing capabilities. The concept of zoom optics, where two sets of focusing elements (e.g., CRLs and KB mirrors) are used to provide variable beam sizes at a fixed focal plane, is optimized analytically. The effects of figure errors on the vertical spot size and on the local coherence along the vertical direction of the optimized design are investigated.

关键词： beamline design x-ray optics simulation beam coherence zoom optics

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