Serial Powering Tests with RD53A

The high luminosity upgrade for the Large Hadron Collider at CERN requires a complete overhaul of the ATLAS detector. The current tracking detector will be replaced by an all-silicon tracking detector, the ITk. It will occupy the same volume as the current ATLAS tracker and will cover a significantly larger phase space. The new Front-End chips for the pixel detector are developed within the RD53 collaboration together with CMS. Due to the increased power consumption and the increased number of modules, a serial powering scheme has to be deployed. While the concept of serial powering has already been proven using FE-I4 readout chips, detector prototypes with the new FE chips are now being built by the ITk collaboration. This talk presents an overview of first serial powering tests with RD53A, the current prototype readout chip for ATLAS and CMS, focusing on on-module current distribution and HV distribution in a serially powered chain.