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SYQD: Symposium Precise Quantum Detectors in Space, Time and Energy – Semi- and Superconductors in Particle and Condensed Matter Physics
SYQD 1: Precise Quantum Detectors in Space, Time and Energy – Semi- and Superconductors in Particle and Condensed Matter Physics
SYQD 1.5: Invited Talk
Thursday, September 11, 2025, 12:15–12:40, ZHG104
ALICE ITS3 – the ultimate paper wrap pixel detector — •Magnus Mager — CERN, Geneva, Switzerland
Over the last decade, Monolithic Active Pixel Sensors (MAPS), fabricated in commercial CMOS Imaging technologies, have made their way into several high-energy physics applications, where low material budgets and high resolution are crucial. With its current, record-holding 10 m2, 12.5 GPixel Inner Tracking System, ITS2, ALICE currently showcases this technology and harvests physics data of unprecedented resolution.
To further improve the experiment, ALICE is upgrading the innermost three tracking layers in the next Long Shutdown of LHC (LS3, 2026–2030) with a novel detector, the ITS3. This detector will be based on truly cylindrical, bent (down to radii of 19 mm), wafer-scale (up to 10×27 cm) MAPS. The sensors are thinned down to 50 µm, and are wrapped around the beam pipe, held in place by carbon foam spacers.
During the R&D phase (2019–2024), a number of novel developments have been demonstrated, notably including the qualification of 65nm MAPS, the demonstration of wafer-scale stitched MAPS, and the demonstration of bent MAPS.
In this talk, the detector concept will be introduced, key R&D results presented, and the path towards detector installation in 2028 given.
Keywords: Monolithic Active Pixel Sensors (MAPS); CMOS sensors; High Energy Physics (HEP); vertex detectors