PSD14: International Conference on Position Sensitive Detectors

First evaluation of ColorPix-3 ASIC

Not scheduled

20m

Mile End Campus: Graduate Centre Foyer and Peston Lecture Theatre (Queen Mary University of London, London, UK)

Poster Advances in Pixel Detectors & Integration Technologies

Speakers

Jan Broulim (Czech Technical University in Prague (CZ)) Karolina Lavickova (Czech Technical University in Prague (CZ))

Description

In this contribution, we present the first characterization measurements of the ColorPix-3 ASIC integrated with the UniCorn readout interface. ColorPix-3 features a 32 × 32 pixel matrix with a pixel pitch of 70 μm and is designed for high-resolution, position-sensitive, and energy-resolved X-ray imaging. A 2 mm-thick CZT sensor layer is bump-bonded to the ASIC and serves as the detection medium, providing significantly higher X-ray and gamma-ray detection efficiency than conventional silicon-based sensors.

The ASIC records data in the form of hit counts across ten configurable energy thresholds. Due to device-to-device variations, several DAC parameters must be optimized prior to operation. We describe the complete calibration and equalization procedure, including threshold scans, pixel offset compensation, and energy-threshold calibration, followed by measurements performed under X-ray irradiation.

The experimental results confirm the intended functionality of the chip and demonstrate key detector characteristics, including charge-sharing effects between neighboring pixels. Finally, we discuss implications and the following applications.