Characterising Silicon Pixel Modules for the Upgrade of the ATLAS Inner Tracker (ITk)

From 2029, the High-Luminosity Large Hadron Collider (HL-LHC), which is currently under development, will begin running. An increase in the rate of collisions is expected to increase the sensitivity to new and exciting physics. In preparation, some of the LHC detectors are being upgraded to be better suited to taking measurements under the conditions the HL-LHC will create. The ATLAS Inner Detector is being upgraded to an all-silicon Inner Tracker (ITk). Silicon pixel modules (silicon sensors connected to data readout electronics) which form part of the ITk, are being electrically tested at CERN. Electrical testing allows one to measure the production quality of a module, in turn determining its suitability for use in the detector. This short report details the testing procedure for such modules and highlights the importance of running such tests.