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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

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Simulation framework for X-ray grating interferometry optimization.

Simon Spindler, Alexandre Pereira, Pascal Sommer

|January 29, 2025

Summary

This summary is machine-generated.

A new simulation framework enhances X-ray interferometry by modeling wave-front propagation with arbitrary source sizes. This approach accurately predicts system imperfections and optimizes spectral sampling for improved image acquisition.

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Last Updated: May 30, 2025

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Area of Science:

Optics and Photonics
X-ray Science and Technology
Computational Physics

Background:

Plane wave simulations are limited in X-ray interferometry, lacking angular resolution for source size and sample effects.
Existing methods struggle to model system imperfections and inhomogeneous samples with realistic X-ray source characteristics.

Purpose of the Study:

To develop a versatile wave-front propagation simulation framework for X-ray interferometry.
To incorporate effects of source size, system imperfections, and sample properties directly into wave propagation.
To provide a tool for designing and optimizing X-ray optical components and experimental configurations.

Main Methods:

Developed a novel simulation framework integrating optical components, samples, and arbitrary X-ray source sizes.
Induced system imperfections and sample inhomogeneities directly within the wave propagation calculations.
Implemented GPU acceleration and out-of-memory computation capabilities for large-scale simulations.

Main Results:

Successfully predicted and explained the impact of local grating defects on interferometric measurements for various focal spot sizes.
Provided optimized spectral sampling strategies for enhanced image acquisition in X-ray experiments.
Validated the framework's ability to handle complex configurations and source characteristics.

Conclusions:

The developed simulation framework offers superior accuracy and flexibility compared to traditional plane wave approaches.
This tool is crucial for the design and optimization of advanced X-ray interferometry devices and experiments.
The publicly available framework (on Github) facilitates wider adoption and advancement in the field.