Development of partially-coherent wavefront propagation simulation methods for 3rd and 4th generation synchrotron radiation sources

Chubar, Oleg; Berman, L. E.; Chu, Yong S.; Fluerasu, Andrei; Hulbert, S. L.; Idir, Mourad; Kaznatcheev, Konstantine; Shapiro, David A.; Shen, Qun; Baltser, Jana

doi:10.1117/12.892812

Cited by 44 publications

(25 citation statements)

References 21 publications

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“…For this reason, we confine this discussion to high-quality systems. In more complex cases, including those with partially coherent illumination, wavefront propagation calculations, such as those described by Chubar et al [18,19], and by Yashchuk et al [20] may be necessary. …”

Section: Maximizing the Strehl Ratiomentioning

confidence: 99%

Optimized mirror shape tuning using beam weightings based on distance, angle of incidence, reflectivity, and power

Goldberg

Yashchuk

2016

Review of Scientific Instruments

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For glancing-incidence optical systems, such as short-wavelength optics used for nano-focusing, incorporating physical factors in the calculations used for shape optimization can improve performance. Wavefront metrology, including the measurement of a mirror's shape or slope, is routinely used as input for mirror figure optimization on mirrors that can be bent, actuated, positioned or aligned. Modeling shows that when the incident power distribution, distance from focus, angle of incidence, and the spatially-varying reflectivity are included in the optimization, higher Strehl ratios can be achieved.Following the works of Maréchal and Mahajan, optimization of the Strehl ratio (for peak intensity with a coherently illuminated system) occurs when the expectation value of the phase error's variance is minimized. We describe an optimization procedure based on regression analysis that incorporates these physical parameters. This approach is suitable for coherently-illuminated systems of nearly diffraction-limited quality. Mathematically, this work is an enhancement of the methods commonly-applied for ex-situ alignment, based on uniform weighting of all points on the surface (or a sub-region of the surface). It follows a similar approach to the optimization of apodized and non-uniformly illuminated optical systems.Significantly, it reaches a different conclusion than a more recent approach based on minimization of focal plane ray errors.

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Section: Maximizing the Strehl Ratiomentioning

confidence: 99%

Optimized mirror shape tuning using beam weightings based on distance, angle of incidence, reflectivity, and power

Goldberg

Yashchuk

2016

Review of Scientific Instruments

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“…the emission by the entire finite emittance electron beam in the NSLS-II storage ring. The recently developed parallel processing version of SRW [4] was used to simulate the emission and propagation of electric fields from individual macro-electrons distributed over the entire phase space of the electron beam. After the propagation through the set of beamline components described above, the Stokes components were averaged to obtain the same diffraction pattern as described above, but for partially coherent radiation.…”

Section: Srw Simulations Of Wavefront Distortions From Horizontally Dmentioning

confidence: 99%

Partially coherent wavefront propagation simulations: Mirror and monochromator crystal quality assessment

Wiegart

Fluerasu

Bruhwiler

et al. 2016

AIP Conference Proceedings

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“…The wave optics formalism is a natural and reliable way to deal with interference effects that are unavoidable in coherent beam propagation (Bahrdt et al, 2014;Chubar et al, 2011). We present here the WavePropaGator (WPG) package, the goal of which is to provide a user-friendly software environment that any scientist involved in XFEL optics design can use, without having specific experience in numerical wave optics calculations.…”

Section: Introductionmentioning

confidence: 99%

“…We present here the WavePropaGator (WPG) package, the goal of which is to provide a user-friendly software environment that any scientist involved in XFEL optics design can use, without having specific experience in numerical wave optics calculations. The package is built on top of the open-source Synchrotron Radiation Workshop (SRW) software (Chubar et al, 2011), which is actively used for development of X-ray and infrared beamlines at synchrotron light sources. The SRW code is based on the principle of physical optics using FFT and asymptotic expansion based propagators and is capable of accurate modeling of fully and partially coherent synchrotron radiation emission and propagation through different types of optics.…”

Section: Introductionmentioning

confidence: 99%

WavePropaGator: interactive framework for X-ray free-electron laser optics design and simulations

et al. 2016

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This article describes the WavePropaGator (WPG) package, a new interactive software framework for coherent and partially coherent X-ray wavefront propagation simulations. The package has been developed at European XFEL for users at the existing and emerging free-electron laser (FEL) facilities, as well as at the third-generation synchrotron sources and future diffraction-limited storage rings. The WPG addresses the needs of beamline scientists and user groups to facilitate the design, optimization and improvement of X-ray optics to meet their experimental requirements. The package uses the Synchrotron Radiation Workshop (SRW) C/C++ library and its Python binding for numerical wavefront propagation simulations. The framework runs reliably under Linux, Microsoft Windows 7 and Apple Mac OS X and is distributed under an opensource license. The available tools allow for varying source parameters and optics layouts and visualizing the results interactively. The wavefront history structure can be used for tracking changes in every particular wavefront during propagation. The batch propagation mode enables processing of multiple wavefronts in workflow mode. The paper presents a general description of the package and gives some recent application examples, including modeling of full X-ray FEL beamlines and start-to-end simulation of experiments.

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Development of partially-coherent wavefront propagation simulation methods for 3rd and 4th generation synchrotron radiation sources

Cited by 44 publications

References 21 publications

Optimized mirror shape tuning using beam weightings based on distance, angle of incidence, reflectivity, and power

Optimized mirror shape tuning using beam weightings based on distance, angle of incidence, reflectivity, and power

Partially coherent wavefront propagation simulations: Mirror and monochromator crystal quality assessment

WavePropaGator: interactive framework for X-ray free-electron laser optics design and simulations

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