The LHCf experiment is the smallest of the six LHC experiments and it has been proposed and built as a fully dedicated astroparticle experiment at LHC. The aim of the experiment is indeed to provide a detailed calibration of the Monte Carlo models used in High Energy Cosmic Ray Physics through the measurement of the neutral particles emitted in the very forward region at LHC. LHCf consists of two calorimeters placed in the LHC tunnel near the ATLAS interaction point. The two calorimeters have also position measurement capabilities thus ensuring the possibility to measure neutral particles in the pseudo-rapidity region greater than eight with execellent performances. In this paper, the status of the two detectors, their performances and the Physics reach is described.
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