Speaker
Description
ALICE ITS2: Performance and Operational Experience
The ALICE Inner Tracking System (ITS) is the innermost tracking detector at the ALICE experiment, providing vertex reconstruction and tracking of charged particles.
The upgraded version, referred to as ITS2 and currently operating in ALICE, consists of seven cylindrical layers of Monolithic Active Pixel Sensors (MAPS) covering 10 m$^{2}$ of active area.
These so-called ALPIDE sensors, manufactured in 180 nm CMOS technology, feature 27 $\times$ 29 $\mu$m pixel dimensions resulting in a spatial resolution of about 5 $\mu$m and are thinned to 50 $\mu$m (innermost three layers) and 100 $\mu$m (outer four layers), achieving a low material budget of 0.36\% X$_{0}$ per innermost layer.
In this contribution, the operational experience during LHC Run 3 as well as performance results are summarized.
This includes threshold stability, fake-hit rate, fraction of noisy pixels, detector efficiency, and impact-parameter resolution as well as beam background effects.
Moreover, selected curiosities, such as the measurement of energy loss achieved by detuning the detector front-end circuitry and oversampling its response, will also be presented.
