ATLAS Forward Proton Detector

The purpose of the ATLAS Forward Proton (AFP) detector is to measure protons scattered at very small angles. AFP aims to study diffractive events, exclusive production and photon induced interactions. The first arm of AFP with 3D pixel detectors was installed in early 2016 and data to study the tracker performance were recorded later that year during special low luminosity runs. The full two-arm setup (on both sides of the interaction point) was installed during the 2016/2017 LHC winter shutdown. In 2017, AFP participated in the ATLAS high-luminosity data taking on a daily basis. In addition, several special runs with reduced luminosity were taken. This paper presents the AFP detector and its performance during 2016 and 2017.