AstroPix: an HV-CMOS Silicon Sensor for the Barrel Imaging Calorimeter at the ePIC Detector
ORAL
Abstract
AstroPix is a high-voltage CMOS (HV-CMOS) monolithic silicon sensor originally developed to enable precision gamma-ray imaging and spectroscopy in the medium-energy regime (~100 keV–100 MeV) based on the experience from ATLASpix and MuPix. It features a 500 µm pixel pitch, on-pixel amplification and digitization, and low power consumption (target ~1.5 mW/cm²), making it easily scalable for use in large detectors. The sensor is designed to cover a dynamic range from 25 keV to 700 keV.
With these features, AstroPix meets the requirements of the imaging layers of the Barrel Imaging Calorimeter (BIC) in the ePIC detector at the future Electron-Ion Collider (EIC). In BIC, AstroPix-based imaging layers, interleaved within the lead/scintillating-fiber (Pb/SciFi) sampling calorimeter, provide fine-grained shower imaging, enabling key performance features such as electron/pion and gamma/pion separation with precise energy and position resolutions.
As part of ongoing detector R&D efforts, we have been testing several configurations containing a successively increasing number of AstroPix version 3: starting from a single chip, to a 2×2 chips module called quad-chip, a three-layer stack of quad chips, and a 9×1 chip PCB module that represents the smallest prototype unit of the imaging layer. In this talk, I will present highlights from recent performance test results of these configurations, focusing on the characterization of a single AstroPix v3 chip and the demonstration of functionality of 4- and 9-chip daisy-chained modules.
With these features, AstroPix meets the requirements of the imaging layers of the Barrel Imaging Calorimeter (BIC) in the ePIC detector at the future Electron-Ion Collider (EIC). In BIC, AstroPix-based imaging layers, interleaved within the lead/scintillating-fiber (Pb/SciFi) sampling calorimeter, provide fine-grained shower imaging, enabling key performance features such as electron/pion and gamma/pion separation with precise energy and position resolutions.
As part of ongoing detector R&D efforts, we have been testing several configurations containing a successively increasing number of AstroPix version 3: starting from a single chip, to a 2×2 chips module called quad-chip, a three-layer stack of quad chips, and a 9×1 chip PCB module that represents the smallest prototype unit of the imaging layer. In this talk, I will present highlights from recent performance test results of these configurations, focusing on the characterization of a single AstroPix v3 chip and the demonstration of functionality of 4- and 9-chip daisy-chained modules.
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Publication: [1] Y. Suda et al., Performance evaluation of the high-voltage cmos active pixel sensor astropix for<br>gamma-ray space telescopes, Nuclear Instruments and Methods in Physics Research Section A:<br>Accelerators, Spectrometers, Detectors and Associated Equipment 1068 (2024) 169762.<br>[2] Henry Klest et al., Evaluation of the Response to Electrons and Pions in the Scintillating Fiber and Lead Calorimeter for the Future Electron-Ion Collider, https://doi.org/10.48550/arXiv.2504.03079<br>[3] Amanda L. Steinhebel et al., AstroPix: A Pixelated HVCMOS Sensor for Space-Based Gamma-Ray Measurement, https://arxiv.org/abs/2501.11698
Presenters
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Bobae Kim
Argonne National Laboratory
Authors
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Bobae Kim
Argonne National Laboratory