The first generation of ELT instruments includes an optical-infrared high resolution spectrograph, indicated as ELT-HIRES and recently christened ANDES (ArmazoNes high Dispersion Echelle Spectrograph). ANDES consists of three fibre-fed spectrographs ([U]BV, RIZ, YJH) providing a spectral resolution of ∼100,000 with a minimum simultaneous wavelength coverage of 0.4-1.8 μm with the goal of extending it to 0.35-2.4 μm with the addition of an U arm to the BV spectrograph and a separate K band spectrograph. It operates both in seeing- and diffraction-limited conditions and the fibre-feeding allows several, interchangeable observing modes including a single conjugated adaptive optics module and a small diffraction-limited integral field unit in the NIR. Modularity and fibre-feeding allows ANDES to be placed partly on the ELT Nasmyth platform and partly in the Coudé room. ANDES has a wide range of groundbreaking science cases spanning nearly all areas of research in astrophysics and even fundamental physics. Among the top science cases there are the detection of biosignatures from exoplanet atmospheres, finding the fingerprints of the first generation of stars, tests on the stability of Nature’s fundamental couplings, and the direct detection of the cosmic acceleration. The ANDES project is carried forward by a large international consortium, composed of 35 Institutes from 13 countries, forming a team of almost 300 scientists and engineers which include the majority of the scientific and technical expertise in the field that can be found in ESO member states.
With this work we summarise the design evolution and challenges of the Fiber-Link module for ANDES (ArmazoNes high Dispersion Echelle Spectrograph), the high resolution spectrograph for ESO ELT. The instrument just passed the System Architecture Review of Phase-B1. The Fiber-Link subsystem carries and redistributes the light from the telescope to the spectrometers via several selectable optical paths. The general updated layout for the Fiber-Link module is presented giving element characteristics and obtained performances. First results from laboratory test and prototype activities are also shown. Moreover, we include the reasoning for selected solutions and explaining how requirements are met. Finally, we summarise the compliance against the science top-level requirements and the issues to address moving forward.
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