研究目的
Investigating the speckled structure of the cross-spectral density associated with partially coherent x-ray beams from a modern undulator, focusing on the emergence of coherence vortices and domain walls.
研究成果
The study demonstrates that coherence vortices and domain walls naturally emerge in the cross-spectral density of partially coherent x-ray beams from modern undulators. These correlation singularities influence the coherence properties of the beam and have implications for imaging and diffraction applications. Understanding these phenomena enhances the ability to exploit partially coherent x-ray radiation from advanced synchrotron sources.
研究不足
The study is computational and does not include experimental validation. The complexity of the cross-spectral density calculations requires significant computational resources, and the propagation of the cross-spectral density involves approximations that may not capture all physical phenomena.
1：Experimental Design and Method Selection:
The study employs a realistic model for calculating the cross-spectral density of partially coherent beams from an x-ray undulator. The methodology involves the coherent-mode expansion to represent the cross-spectral density in terms of eigenvalues and coherent modes.
2：Sample Selection and Data Sources:
The model is applied to an x-ray undulator in a modern storage ring, specifically considering the EBS (Extremely Brilliant Source) at the European Synchrotron Radiation Facility (ESRF).
3：List of Experimental Equipment and Materials:
The study is computational, utilizing the COherent Modes for SYnchrotron Light (COMSYL) package for numerical evaluation of the cross-spectral density.
4：Experimental Procedures and Operational Workflow:
The cross-spectral density is calculated at the source position and propagated to different distances in the near field, intermediate field, and far field to observe the evolution of coherence vortices and domain walls.
5：Data Analysis Methods:
The analysis focuses on the phase and magnitude of the cross-spectral density, identifying coherence vortices and domain walls through their topological properties.
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