Direct 2D spatial-coherence determination using the Fourier-analysis method: multi-parameter characterization of the...

Area of Science:

• * Synchrotron radiation physics
• * Materials science characterization

Background:

• * Soft X-ray beamlines are crucial for advanced materials research.
• * Spatial coherence is a key parameter for many X-ray experiments.

Purpose of the Study:

• * To systematically analyze the 2D spatial coherence of the P04 beamline at PETRA III.
• * To identify optimal beamline configurations for coherence-dependent experiments.
• * To investigate sources of spatial coherence degradation.

Main Methods:

• * Systematic 2D spatial-coherence analysis.
• * Utilized Fourier-analysis method with disordered nanodot samples.
• * Exploited charge scattering for arbitrary X-ray photon energies.

Main Results:

• * Evaluated spatial coherence for various P04 beamline configurations.
• * Identified the influence of different beam-defining apertures.
• * Measured significant spatial coherence degradation in the vertical direction.

Conclusions:

• * Optimal conditions for coherence-based experiments at P04 were determined.
• * Sources of vertical spatial coherence degradation were identified.
• * The Fourier-analysis method provides efficient 2D spatial coherence assessment.