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. The ALICE experiment has recently completed a major upgrade of its detectors during the most recent LHC Long Shutdown (LS2). A key part of the upgrade was the replacement of the ALICE Inner Tracking System (ITS) with a full silicon-pixel detector constructed entirely with CMOS monolithic active pixel sensors (MAPS). The ITS2 consists of seven cylindrical layers covering 10 m2 and containing 12.5 billion pixels. The increased granularity, very low material budget (0.35% X0/layer in the inner barrel), and small radius of the innermost layer will result in a significant improvement of impact-parameter resolution and tracking efficiency at low pT with respect to the previous tracker. ALICE is also looking ahead to the next tracking upgrade planned for installation during the LHC LS3. Exploiting the flexibility of silicon when thinned down to thicknesses of O(50um), and the possibility of producing MAPS sensors of wafer size by a process known as stitching, the ALICE ITS3 project is aiming at building detector elements that are large enough to cover full tracker half-layers with single bent sensors. In this talk, the first results of the performance of the new ALICE ITS2 detector, studied during commissioning, will be presented, together with an overview of the ITS3 R&D status.
Zoom link: https://stanford.zoom.us/j/94642768923?pwd=NmtNVXVvMGhoTWhqNnE3dXh4U1dKUT09
Password: 134699
Meeting ID: 946 4276 8923
Andrew Bradshaw, Sander Breur
(bradshaw@slac, sanderb@slac)
