Abstract
In the high-luminosity era of the Large Hadron Collider, the instantaneous luminosity is expected to reach unprecedented values, resulting in up to 200 proton-proton interactions per bunch crossing. To cope with the resulting increase in occupancy, bandwidth and radiation damage, the ATLAS Inner Detector will be replaced by an all-silicon system, the Inner Tracker (ITk), where the innermost part will consist of a pixel detector with about 14 m2 of active area. Several silicon sensor technologies will be employed in order to deal with the strict requirements in terms of radiation hardness, power dissipation and production yield. Prototype modules assembled with RD53A readout chips are being built to evaluate their production rate, thermal- and electrical performance, before- and after irradiation. In addition, a novel serial powering scheme will be implemented in the ITk pixel detector, which will help to reduce the material budget of the detector inside the active detector volume as well as power dissipation. Multiple system-level tests are being done with serial powering of pixel modules. The latest development of prototype modules, serial powering tests, and procedures of integration of modules and electrical services are presented.