Targeting a peak luminosity of 6 × 1035 cm-2s-1, the Belle II experiment at the SuperKEKB in Japan is considering an upgrade of its interaction region. This upgrade involves the vertex detector, which will be replaced by a new fully pixelated vertex detector (VTX). A monolithic CMOS pixel sensor named OBELIX (Optimized BELle II pIXel) is proposed to be used in the VTX. Based on the existing TJ-Monopix2 chip initially developed for the ATLAS Inner Tracker (ITk) upgrade, OBELIX is designed in a 180 nm CMOS process with an improved pixel matrix and additional functionalities such as new on-chip voltage regulators and digital periphery. This paper will review the overall design of the VTX and the OBELIX sensor.
Design of the OBELIX monolithic CMOS pixel sensor for the Belle II vertex detector upgrade
Barbero M.;Bettarini S.;Corona L.;Gaioni L.;Giroletti S.;Minuti M.;Pham H.;Ratti L.;Traversi G.;Xu D.
2025-01-01
Abstract
Targeting a peak luminosity of 6 × 1035 cm-2s-1, the Belle II experiment at the SuperKEKB in Japan is considering an upgrade of its interaction region. This upgrade involves the vertex detector, which will be replaced by a new fully pixelated vertex detector (VTX). A monolithic CMOS pixel sensor named OBELIX (Optimized BELle II pIXel) is proposed to be used in the VTX. Based on the existing TJ-Monopix2 chip initially developed for the ATLAS Inner Tracker (ITk) upgrade, OBELIX is designed in a 180 nm CMOS process with an improved pixel matrix and additional functionalities such as new on-chip voltage regulators and digital periphery. This paper will review the overall design of the VTX and the OBELIX sensor.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
