Intensity interferometry of single x-ray pulses from a synchrotron storage ring

Area of Science:

• X-ray physics
• Synchrotron radiation science
• Detector technology

Background:

• High-brilliance synchrotron radiation sources enable advanced X-ray experiments.
• Accurate measurement of X-ray coherence is crucial for applications like coherent imaging.
• Novel detector technologies are needed to keep pace with source brilliance.

Purpose of the Study:

• To report on measurements of second-order intensity correlations using a novel detector.
• To determine the transverse coherence length of X-rays at 14.4 keV.
• To validate the performance of an adaptive gain integrating pixel detector prototype.

Main Methods:

• Utilized the high-brilliance storage ring PETRA III.
• Employed a prototype adaptive gain integrating pixel detector.
• Measured second-order intensity correlations at various spatial separations for individual synchrotron radiation pulses (14.4 keV, ~5 MHz).

Main Results:

• Successfully recorded individual synchrotron radiation pulses.
• Determined the transverse coherence length at 14.4 keV.
• Achieved good agreement between experimental measurements and Gaussian Schell model simulations.

Conclusions:

• The adaptive gain integrating pixel detector is suitable for high-brilliance synchrotron radiation measurements.
• The experimental method accurately determines transverse coherence length.
• Validated theoretical models for X-ray coherence at high energies.