ALICE ITS Upgrade for LHC Run 3: Commissioning in the Laboratory

TL;DR

The paper discusses the commissioning of the upgraded ALICE Inner Tracking System (ITS 2) for LHC Run 3, featuring advanced CMOS Monolithic Active Pixel Sensors to enhance heavy-ion collision studies.

Contribution

It introduces a new silicon-based detector with CMOS sensors for the ALICE experiment, enabling reconstruction of rare physics channels previously inaccessible.

Findings

Successful laboratory commissioning of the new detector

Enhanced capability for rare physics channel reconstruction

Implementation of CMOS Monolithic Active Pixel Sensors

Abstract

ALICE is the CERN LHC experiment optimised for the study of the strongly interacting matter produced in heavy-ion collisions and devoted to the characterisation of the quark-gluon plasma. To achieve the physics program for LHC Run 3, a major upgrade of the experimental apparatus is ongoing. A key element of the upgrade is the substitution of the Inner Tracking System (ITS) with a completely new silicon-based detector (ITS 2) whose features will allow the reconstruction of rare physics channels not accessible with the previous layout. The enabling technology for such a performance boost is the adoption of custom-designed CMOS Monolithic Active Pixel Sensor as detecting elements. In this proceedings, an overview of the adopted technologies as well as the status of the detector commissioning will be given.