ALICE upgrades for Run 4 and Run 5
A. Ferretti (for the ALICE Collaboration)

TL;DR
ALICE plans significant upgrades for Run 4 and Run 5, including a new Inner Tracking System with bent pixel sensors, a Forward Calorimeter for small-x gluon measurements, and the ALICE 3 detector with advanced silicon sensors for broad physics exploration.
Contribution
This paper presents detailed upgrade plans for ALICE, introducing innovative detector technologies like bent pixel sensors and a comprehensive ALICE 3 detector for enhanced physics capabilities.
Findings
Development of bent pixel sensors for reduced material budget.
Design of the new Forward Calorimeter (FoCal) for small-x gluon studies.
Conceptualization of the ALICE 3 detector with monolithic silicon sensors.
Abstract
In view of Run 4 at the LHC, presently scheduled from 2029 onwards, ALICE is pursuing several upgrades to further extend its physics reach. In order to improve heavy-flavor hadron and dielectron measurements which rely on secondary vertexing, a reduction of the material budget of the innermost layers of the Inner Tracking System is needed. This can be achieved with bent pixel sensors, arranged in half-cylinder shapes with integrated power lines and data buses, allowing to get rid of most of the supporting structure and of the water cooling. Moreover, a new Forward Calorimeter (FoCal), covering pseudorapidities of , has been proposed to measure small-x (down to ) gluon distributions via prompt photon production. The FoCal will be composed of a highly granular Si+W electromagnetic calorimeter combined with a conventional sampling hadronic calorimeter, and will…
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Particle Detector Development and Performance · High-Energy Particle Collisions Research
