Speaker
Description
The upgraded Inner Tracking System (ITS2) of the ALICE experiment at the Large Hadron Collider at CERN is based on Monolithic Active Pixel Sensors (MAPS). With a sensitive area of about 10 m^2 and 12.5 billion pixels, ITS2 represents the largest pixel detector in high-energy physics. The detector consists of seven concentric layers equipped with ALPIDE pixel sensors manufactured in the TowerJazz 180 nm CMOS Imaging Sensor process. The ALPIDE chips feature a pixel pitch of O(30 µm) reaching an intrinsic spatial resolution of about 5 µm. ITS2 has a very low material budget of 0.36% X_0/layer for the three innermost layers and 1.1% X_0/layer for the outer layers. The high spatial resolution and low material budget in combination with small radial distance of the innermost layer of 23 mm from the interaction point make the detector well suited for secondary vertex reconstruction as well as for tracking at low transverse momentum.
This contribution will review the detector performance during the LHC Run 3 and give an overview on the calibration methods and running experience.
| Primary experiment | ALICE |
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