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Babeluk, M. et al, Lacasta, C., Marinas, C., Mazorra de Cos, J., & Vobbilisetti, V. (2024). The OBELIX chip for the Belle II VTX upgrade. Nucl. Instrum. Methods Phys. Res. A, 1067, 169659–3pp.
Abstract: The OBELIX depleted monolithic active CMOS pixel sensor (DMAPS) is currently developed for the upgrade of the vertex detector of the Belle II experiment located at Tsukuba/Japan. The pixel matrix of OBELIX is inherited from the TJ-Monopix2 chip, but the periphery includes additional features to improve performance and allow the integration into a larger detector system. The new features include a trigger unit to process trigger signals, a precision timing module and a possibility to transmit low granularity hit information with low latency to contribute to the Belle II trigger. Additionally, low dropout voltage regulators and an ADC to monitor power consumption and substrate temperature is developed. This paper will focus on the trigger contribution capabilities of the OBELIX chip.
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Belle II VTX Collaboration(Babeluk, M. et al)., Marinas, C., & Mazorra de Cos, J. (2024). The DMAPS upgrade of the Belle II vertex detector. Nucl. Instrum. Methods Phys. Res. A, 1064, 169428–5pp.
Abstract: The Belle II experiment at KEK in Japan considers an upgrade for the vertex detector system in line with the accelerator upgrade for higher luminosity at long shutdown 2 planned for 2028. One proposal for the upgrade of the vertex detector called VTX aims to improve background robustness and reduce occupancy using small and fast pixels. VTX accommodates the OBELIX depleted monolithic active CMOS pixel sensor (DMAPS) on all five proposed layers. OBELIX is specifically developed for the VTX application and based on the TJ-Monopix2 chip initially developed to meet the requirements of the outer layers of the ATLAS inner tracker (ITk). This paper will review recent tests of the TJ-Monopix2 chip as well as various design aspects of the OBELIX-1 chip currently under development.
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Rizzo, G. et al, Lacasta, C., Marinas, C., Mazorra de Cos, J., & Vobbilisetti, V. (2025). The DMAPS upgrade of the Belle II Vertex Detector. Nucl. Instrum. Methods Phys. Res. A, 1072, 170164–5pp.
Abstract: The SuperKEKB collider will undergo a major upgrade at the end of the decade to reach the target luminosity of 6x1035 cm-2s-1, offering the opportunity to install a new fully pixelated vertex detector (VTX) for the Belle II experiment, based on depleted-MAPS sensors. The VTX will be more granular and robust against the expected higher level of machine background and more performant in terms of standalone track finding efficiency. The VTX baseline design includes five depleted-MAPS sensor layers, spanning radii from 14 mm to 140 mm, with a material budget ranging from 0.2% to 0.8% X/X0 per layer. All layers will be equipped with the same OBELIX sensor, designed in the TowerJazz 180 nm technology, with the pixel matrix derived from the TJ-Monopix2 sensor originally developed for the ATLAS experiment. The paper will describe the proposed VTX structure and review all project aspects: tests of the TJ-Monopix2 sensor, OBELIX-1 design status, ladder prototype fabrication and tests.
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