Radiation Damage Simulation for the ATLAS Inner Tracker (ITk) System

ATLAS is one of four major experiments at the Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN). In its current run 3 (which began in July 2022), protons collide at a record center-of-mass energy of 13.6 TeV, with over a billion particle collisions occurring each second. The inner tracker (ITk) of the detector receives the most radiation damage from these collisions. Monte Carlo (MC) simulations help model this damage to the detector.

The High Luminosity upgrade to the LHC (HL-LHC) is expected to be operational in 2029. It is expected to produce significantly more collisions than the current LHC and produce, for example, at least 15 million Higgs bosons per year, compared to around three million from the LHC in 2017. Just as the physical ATLAS experiment is being upgraded, the MC simulations must also be updated to incorporate the expected modifications. This presentation will describe steps toward incorporating 3D sensors to the simulation of radiation damage to the ITk for the upgraded ATLAS detector.