Jan 23 – 27, 2023
Bormio, Italy
Europe/Berlin timezone

The ITS3 upgrade of the ALICE Inner Tracking System

Jan 25, 2023, 5:40 PM
Bormio, Italy

Bormio, Italy

Short Contribution Wednesday Afternoon


Prof. Paola La Rocca (INFN Catania)


During the LHC Long Shutdown 3 (LS3) foreseen in 2026-2028, the ALICE collaboration is planning to replace the innermost three layers of the presently installed Inner Tracking System with a novel vertex detector, called ITS3. This further upgrade will improve the efficiency and tracking capabilities of the ALICE detector, especially at low transverse momentum, opening extraordinary opportunities for several physics studies.
To achieve that goal, the proposed ITS3 will consist of truly cylindrical layers made of wafer-scale, thin and flexible stitched CMOS pixel sensors, with the innermost layer positioned at only 18 mm radial distance from the interaction point. According to the detector design, the material budget will be lowered to an unprecedented value of 0.05%X0 per layer and the pointing resolution will be improved by a factor of two.
In this contribution, the ITS3 project will be presented, starting from the motivations of building such a device, later discussing the detector layout and specifications, and concluding with some selected highlights of the achieved R&D results.

Topic Detectors and new facilities

Primary author

Prof. Paola La Rocca (INFN Catania)

Presentation materials