Depleted Monolithic Active Pixel Sensors for the Belle II Vertex Detector Upgrade

by Maximilian Babeluk (MBI - Marietta Blau Institute for Particle Physics of the Austrian Academy of Sciences)

Wednesday 8 Oct 2025, 15:00 → 16:00 Europe/Rome

Sala G. Galilei (131) (INFN - Pisa)

Abstract: 

Depleted Monolithic Active Pixel Sensors (DMAPS) are an emerging technology in particle physics detector development. By combining sensing and readout electronics in a single silicon device, DMAPS offer a simpler and more compact alternative to conventional hybrid detectors, with reduced material budget and simplified integration. These features make them particularly attractive for high-precision experiments such as Belle II at the SuperKEKB collider in Japan, where minimal material in the vertex detector is essential to achieve the desired measurement accuracy in the b-sector.

In this seminar, I will present the development of the Optimized BeLle Ii piXel sensor (OBELIX), a DMAPS chip designed for the planned upgrade of the Belle II Vertex detector. Building on the TJ-Monopix2 prototype, OBELIX introduces significant improvements in its digital periphery, including enhanced trigger handling, precision timing capabilities, and on-chip monitoring systems. I will discuss the design concept, simulation results, and first performance studies, as well as their relevance for the Belle II upgrade program.