Measurement of Radiation Damage through Leakage Current Monitoring of the ATLAS Pixel Detector

Radiation damage incurred by the silicon modules in the ATLAS Pixel Detector $B$-Layer, Layer-1, Layer-2, and disks from the beginning of 2011 through November 2018 has been monitored through measurement of the leakage current. The measurement makes use of the fact that increase of leakage current is linearly proportional to the received hadronic fluence. The data are acquired with two leakage current monitoring systems and include single module precision. Also reported are predictions made with the Hamburg Model which are scaled to match the average magnitude of the leakage current data. Comparisons of fluence predictions by Pythia8 $+$ FLUKA to the fluence determined from leakage current data combined with the Hamburg Model are made for each barrel layer and disk. Finally, projections of the lifetime of the Pixel Detector barrel layers and disks are made using several scenarios for the expected sensor temperatures and fluence rates, and extrapolating from the leakage current data and the Hamburg Model predictions, through 2023 and 500 fb$^{-1}$ of total collected luminosity.