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4MOST, the 4m Multi Object Spectroscopic Telescope, is an upcoming optical, fibre-fed, MOS facility for the VISTA telescope at ESO's Paranal Observatory in Chile.Its main science drivers are in the fields of galactic archeology, highenergy physics, galaxy evolution and cosmology.The 4MOST consortium consists of several institutes in Europe and Australia under leadership of the Leibniz-Institut für Astrophysik Potsdam (AIP).4MOST is currently in its Assembly, Integration and Tests Phase with an expected start of science operations in 2025.Then the two LRS were partially disassembled and sent to Potsdam.They have now been fully integrated, aligned and tested at Potsdam by the CRAL team.The integration of both LRS with the others sub-systems in order to validate the global end-to-end tests is foreseen in 2024 and an installation at VISTA telescope is expected in 2025.This paper describes the assembly, integration and performances achieved at Postdam for the both Low Resolution Spectrographs.Special emphasis is put on the update of procedures and components to improve performances and meet the top-level requirements.
Laurent et al. (Fri,) studied this question.
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