Indirectly illuminated X-ray area detector for X-ray photon correlation spectroscopy

Area of Science:

• Materials Science
• Condensed Matter Physics
• Photonics

Background:

• X-ray Photon Correlation Spectroscopy (XPCS) probes dynamic processes in materials.
• Traditional XPCS detectors face limitations in dynamic range and sensitivity.
• Developing advanced detectors is crucial for expanding XPCS applications.

Purpose of the Study:

• To present a novel indirectly illuminated X-ray area detector for XPCS.
• To demonstrate the detector's flexibility in photon-counting and integrating modes.
• To highlight its suitability for a wide range of sample types and dynamics.

Main Methods:

• The detector utilizes a phosphor screen, microchannel plate image intensifier, coupling lens, and CCD/CMOS sensor.
• Adjustable image intensifier gain allows for photon-counting and integrating measurement modes.
• Switching image sensors provides flexibility in frame rate, dynamic range, and active area.

Main Results:

• High signal-to-noise ratio speckle patterns are achievable in a single shot using integrating mode.
• XPCS measurements can be performed with significantly fewer photons in photon-counting mode.
• The detector accommodates samples with slow or fast dynamics, high or low scattering intensity, and wide or narrow scattering angles.

Conclusions:

• The developed X-ray area detector offers significant versatility for XPCS studies.
• Its adaptable measurement modes and sensor options cater to diverse experimental needs.
• This technology enhances the capability to study complex material dynamics using XPCS.