ALICE ITS3: the first truly cylindrical inner tracker

0584996 - ÚJF 2025 RIV IT eng C - Konferenční příspěvek (zahraniční konf.)
Kotliarov, Artem
ALICE ITS3: the first truly cylindrical inner tracker.
Proceedings of Science. Vol. 449. Trieste: Sissa Medilab srl, 2024, č. článku 538. ISSN 1824-8039.
[The European Physical Society Conference on High Energy Physics (EPS-HEP2023). Hamburg (DE), 21.08.2023-25.08.2023]
Grant CEP: GA MŠMT LM2023040
Institucionální podpora: RVO:61389005
Klíčová slova: ALICE collaboration * inner tracking system * CMOS imaging
Obor OECD: Nuclear physics
https://doi.org/10.22323/1.449.0538

During the next LHC Long Shutdown 3 in 2026-2028, the ALICE Collaboration plans to replace the three innermost layers of the current Inner Tracking System (ITS) with truly cylindrical layers, made of wafer-scale, thin (< 50 μm), and bent Monolithic Active Pixel Sensors (MAPS) that will be produced with the 65 nm CMOS imaging process. To fabricate the wafer-scale sensors, a technology, called stitching, is utilized to 'stitch' small reticles and build sensors up to 300 mm in length in a single wafer. The upgrade aims to decrease the material budget of the innermost layers from the present 0.35% of X0/layer to 0.05% of X0/layer, essentially reducing it to the silicon contribution only. The upgraded ITS will improve the pointing resolution in the transverse plane by a factor of 2 and increase the reconstruction efficiency for low-pT tracks. The construction of this detector encompasses many cutting-edge R&D efforts, for instance, production and characterization of the MAPS in the 65 nm CMOS process, fabrication of the stitched wafer-scale MAPS, and development of an ultra-light detector mechanics and a new air cooling system. This contribution provides a brief overview of the ALICE ITS3 detector and the R&D achievements, mentioned above.
Trvalý link: https://hdl.handle.net/11104/0352774