System-level Tests of Large-scale Multi-module Prototype Structures of the ATLAS ITk Pixel Detector

The ATLAS collaboration will replace its inner detector by an all-silicon tracker (ITk) for the HL-LHC. The new pixel detector will cover a sensitive area of 13m2. The pixel modules are loaded on light-weight carbon structures in the form of (half)rings and staves. Electrically functional prototypes of these local supports based on the RD53A readout chip were built and extensive system-level tests of these structures were carried out evaluating serial powering, grounding and shielding, system monitoring, and the overall performance of the multi-module detector systems. In this contribution, the results of these system tests will be presented.