Optimization and Deployment of Data Acquisition and Processing Systems for Monolithic Active Pixel Sensors

Sumitted to PubDB: 2026-05-02

Category: Master Thesis

Tags: SVD Upgrade

Principal Authors Juraj Habala, Christoph Schwanda
Date 2025-09-09
Belle II Number BELLE2-MTHESIS-2026-016
Abstract In the pursuit of understanding the hidden mechanics of our universe, particle colliders have become one of the most vital components in the exploration of novel physics. In this field, silicon-based detection systems serve as a standard method for accurate tracking and vertex identification. Advances in semiconductor fabrication have made it possible to integrate CMOS electronics directly onto high-resistivity materials and allow high-voltage operation. These developments have led to the creation of radiation tolerant CMOS monolithic active pixel sensors (HV-CMOS). Unlike traditional silicon pixel detectors, HV-CMOS technology combines charge collection mechanisms and signal-processing electronics on a single wafer, thereby improving performance, increasing sensitivity, and reducing material budget. Additionally, the now standardized CMOS manufacturing processes enable cost-effective mass production for large-scale applications. One example of such a sensor is the TJ-Monopix2, currently studied by the Belle II collaboration for the VTX sensor upgrade. In this thesis, the data acquisition system developed for TJ-Monopix2 and similar sensors, including both hardware and software components, was studied, optimized, and further enhanced. In the following the DAQ system was used during a test campaign at the DESY particle accelerator facility. The acquired data were analyzed and interpreted to gain deeper insights into the effects of irradiation, operating temperature, and other factors on sensor performance. These findings contribute to the ongoing development of monolithic active pixel sensors for future high-energy physics applications.
Institute HEPHY Vienna

Files