In a continuous effort to push the energy frontier, CERN’s Large Hadron Collider (LHC) will undergo a major upgrade which will extend its service life and boost the potential for new discoveries beyond 2025. Along with a ten-fold increase in the rate of collisions, the High Luminosity LHC (HL-LHC) is expected to reach unprecedented levels of radiation. In parallel, in the ATLAS experiment an all-silicon tracker capable of coping with the demands of the new collider will replace the current Inner Detector.
The future ATLAS Inner Tracker (ITk) will comprise a Strip Tracker and a Pixel Detector. The construction of both systems will make extensive use of advanced materials and lightweight technologies in order to meet the stringent material budget, thermal performance and stability requirements. However, the ambitious performance targets set for the ITk, the harsh HL-LHC environment and the severe space constraints will give rise to a series of new engineering challenges, the answer to which calls for innovative approaches in the design of the support structures, the cooling strategy and the overall integration scheme.
This talk will review the mechanical design of the ATLAS ITk, focusing on the solutions developed for the support and thermal management of the silicon sensors and readout electronics. The ongoing prototyping activities for these elements will also be discussed.