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

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A Geiger-mode avalanche photodiode array for X-ray photon correlation spectroscopy.

I Johnson¹, Z Sadygov, O Bunk

¹Paul Scherrer Institut, 5232 Villigen PSI, Switzerland. ian.johnson@psi.ch

Journal of Synchrotron Radiation

|December 20, 2008

Summary

A new X-ray detector system enables advanced X-ray photon correlation spectroscopy (XPCS) studies. This system measures temporal fluctuations in diffraction patterns, offering insights into material dynamics across Hz to kHz frequencies.

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Area of Science:

Materials Science
Condensed Matter Physics
Photonics

Background:

X-ray photon correlation spectroscopy (XPCS) is a powerful technique for probing dynamic processes in materials.
Studying dynamics in the Hz to kHz frequency range is crucial for understanding various physical phenomena.
Existing detector systems may have limitations in speed or resolution for certain XPCS applications.

Purpose of the Study:

To develop and demonstrate a novel two-dimensional detector system for X-ray photon correlation spectroscopy (XPCS).
To enable the investigation of system dynamics within the frequency range of several Hz to kHz.
To provide a detailed account of the components and performance of the new detector system.

Main Methods:

Development of a two-dimensional detector system.
Integration of a thin 100 micrometer scintillation crystal with a Geiger-mode avalanche photodiode array.
Characterization of the detector's performance for XPCS measurements.

Main Results:

Successful construction and demonstration of a novel 2D detector for XPCS.
The detector system is capable of measuring fluctuations in the Hz to kHz frequency range.
The system combines a scintillation crystal with a Geiger-mode avalanche photodiode array for enhanced performance.

Conclusions:

The developed X-ray detector system is suitable for advanced XPCS studies.
This technology opens new avenues for investigating material dynamics at intermediate timescales.
The detailed description facilitates the replication and further development of such detector systems.