We will start by describing the physics motivation of installing forward 
detectors in the ATLAS collaboration allowing to detect intact protons in 
the final states. We will detail two main physics topics: the search for 
the Higgs boson at low masses and for photon anomalous coupling. We will 
describe the technology used on the forward detectors, namely the movable 
beam pipes, and the 3D silicon position and the gas and quartz timing 
detectors.