SELUN: a high-speed X-ray photon counting detector for coherent imaging applications

Area of Science:

• X-ray Photon Counting Detectors
• Coherent Diffraction Imaging
• Synchrotron Radiation Science

Background:

• Coherent diffraction imaging (CDI) techniques at synchrotron facilities require advanced detectors for high-resolution imaging.
• Existing detectors face limitations in speed and efficiency, hindering the full potential of modern synchrotron sources.

Purpose of the Study:

• To introduce SELUN, a novel X-ray photon counting hybrid pixel detector optimized for CDI.
• To highlight SELUN's capabilities in meeting the demands of fourth-generation synchrotron sources.

Main Methods:

• Development of a hybrid pixel detector with a 192x192 matrix of 100µm x 100µm pixels.
• Integration of silicon and high-Z sensors for broad energy efficiency.
• Implementation of fast front-end electronics with instant retrigger technology and on-chip data compression.

Main Results:

• Achieved high frame rates up to 120 kfps.
• Demonstrated count rate saturation from 30 to 60 Mcts/s/pixel.
• Obtained energy resolution of 664 eV r.m.s. (Si) and 1.22 keV r.m.s. (CZT).

Conclusions:

• SELUN is a high-performance detector suitable for advanced CDI applications at synchrotrons.
• Its speed and efficiency are optimized for the enhanced brilliance of fourth-generation synchrotron sources.