ALICE upgrades for Run3 and beyond.

Ronchetti F.

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I - Fisica nucleare e subnucleare
Aula Palazzo dell'Emiciclo - Sala Ipogea - Martedì 24 h 09:00 - 12:00
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ALICE (A Large Ion Collider Experiment) is the CERN LHC experiment optimized for the study of the strongly interacting matter produced in heavy-ion collisions, in particular the characterization of the quark-gluon plasma. After the successful operation of the experiment during the first two runs of the LHC, the ALICE collaboration is currently working on a major upgrade of its detector, to be installed during the Long Shutdown (LS2) in 2019--2020. The main goal is to increase the readout capabilities to allow the readout and recording of Pb-Pb minimum bias events at rates in excess of 50 kHz, the expected Pb-Pb interaction rate at the LHC after LS2. The key part of the upgrade is the replacement of the Time Projection Chamber (TPC) proportional readout with GEMs and the construction of a new Inner Tracking System (ITS) that will significantly improve the impact parameter resolution, tracking efficiency and readout capacity enabling the precise measurement of low-momentum particles. The new ITS consists of seven approximately cylindrical detector layers based on CMOS Monolithic Active Pixel Sensors (MAPS) covering a 10 m${}^{2}$ area and containing about 12.5 billion pixels. This contribution will give a brief overview of the motivation of the upgrade, details on the overall layout and reports on both the construction and commissioning status and plans. Ideas on a further novel vertex detector based on curved wafer-scale ultra-thin silicon sensors will be illustrated. Possible applications of the technologies, developed by the ALICE Collaboration, will be shown.

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