Modeling and simulation of beam induced backgrounds measured by ATLAS Forward Proton (AFP) detector

The ATLAS Forward Proton (AFP) detector is a forward detector of the ATLAS experiment at CERN. Its main goal is to trigger diffractive protons in collisions at the Large Hadron Collider (LHC). To achieve this, the detector has to be placed very close to the beam. Inevitable consequence is that its measurements can be easily affected by the beam induced background. This thesis presents a study of the beam induced background in the AFP detector and discuss methods for its removal. The Geant4 simulations and data, including non-colliding bunches are used to identify characteristic features of beam induced backgrounds. A method using combination of signals detected by the AFP detector and the Minimum Bias Trigger Scintillators (MBTS) is used to selected single diffractive event namely on low pile-up data taken during the first AFP physics run in 2016. Finally, an estimate of the beam induced backgrounds level in data together with a study of the radiation environment at the AFP stations was made, comparing results with exploitations.