The tracking detector of the FASER experiment

FASER is a new experiment designed to search for light weakly-interacting long-lived particles (LLPs) and study high-energy neutrino interactions in the very forward region of LHC collisions at CERN. The experimental apparatus situated 480 m downstream ATLAS interaction-point aligned with beam collision axis. detector includes four identical tracker stations constructed from silicon microstrip detectors. Three form tracking spectrometer, enable detect decay products LLPs decaying inside apparatus, whereas fourth station used analysis. spectrometer has been installed complex since March 2021, while not yet installed. will start physics data taking when resumes operation early 2022. This paper describes design, construction testing including associated components such as mechanics, readout electronics, power supplies cooling system.