Speaker
Description
The ALICE experiment has been pioneering the development of monolithic CMOS pixel sensors. ALICE employs CMOS pixel detectors in its pursuit to improve impact parameter resolution and tracking efficiency at low $p_\mathrm{T}$. Their low power consumption, high granularity and high level of integration make CMOS Pixel Sensors well suited for the construction of low mass detectors providing high pointing resolution and tracking efficiency at low $p_\mathrm{T}$. The current ALICE Inner Tracking System, called ITS2, is the largest pixel detector in high-energy physics with an active surface of 10\,m$^2$ and approximately 12.5~billion pixels of a size of approximately $30 \times 30$\,$\mu$m$^2$. The upcoming ITS3 upgrade scheduled for LHC Long Shutdown 3 will be the first to employ bending of 50\,$\mu$m thin, wafer-scale sensors allowing for a significant reduction of the material budget by a factor 4 compared to ITS2 and improve the pointing resolution by a factor 2. The ALICE 3 Vertex Detector, planned for the LHC Long Shutdown 4, will push the limits by being located inside the beam pipe enduring particle loads of 100\,MHz/cm$^2$ and featuring a pixel size of $10 \times 10 $\,$\mu$m$^2$ leading to an unprecedented integration circuit density. Its proximity to the interaction point combined with the small pixel size further improves pointing resolution at low $p_\mathrm{T}$ by a factor of 5 over ITS3. This contribution will provide an overview of the current and future CMOS pixel sensor-based detectors in the ALICE experiment.
