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

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Published on: October 11, 2016

Spatial coherence of synchrotron radiation.

|November 2, 2010

Summary

This summary is machine-generated.

This study analyzes spatial coherence of synchrotron radiation, finding that electron beam properties significantly impact coherence widths, deviating from standard predictions when near the diffraction limit.

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Area of Science:

Physics
Optics
Synchrotron Radiation

Background:

Spatial coherence is crucial for understanding radiation properties.
Synchrotron radiation from insertion devices is a key light source.
Existing models often assume coherence distance is much larger than beam width.

Purpose of the Study:

Analyze spatial coherence of synchrotron radiation in the Fraunhofer limit.
Investigate cases where coherence distance is comparable to beam width.
Develop accurate estimations for coherence widths under general conditions.

Main Methods:

Analysis of monochromatic synchrotron radiation from insertion devices.
Utilizing Fourier transforms and autocorrelations of single-electron field amplitude.
Examining electron beam position and angular distributions.
Applying the Gaussian approximation and the Schell condition.

Main Results:

Formulas derived for spatial coherence properties as products/convolutions.
Gaussian approximation leads to simple coherence width estimates.
Coherence widths deviate from Van Cittert-Zernike values when electron beam phase space is near/below diffraction limit.

Conclusions:

Electron beam phase space dimensions critically influence spatial coherence.
Deviations from standard theories occur under specific beam conditions.
The study provides a more general framework for understanding synchrotron radiation coherence.