Trade-offs in the visible spectrograph of the ELT instrument MOSAIC

A. W. Janssen; E. Sokolova; J. Pragt; J. Kragt; Ramon Navarro; Niels Tromp; E. Fitzsimons; M. Rodrigues; M. Larrieu; A. Kelz; T. Morris; P. Jagourel; F. Chemla; L. Kaper; G. Dalton

doi:10.1117/12.2313302

10 July 2018 Trade-offs in the visible spectrograph of the ELT instrument MOSAIC

A. W. Janssen, E. Sokolova, J. Pragt, J. Kragt, Ramon Navarro, Niels Tromp, E. Fitzsimons, M. Rodrigues, M. Larrieu, A. Kelz, T. Morris, P. Jagourel, F. Chemla, L. Kaper, G. Dalton

Author Affiliations +

Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 107029F (2018) https://doi.org/10.1117/12.2313302
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

MOSAIC is a concept for a multi-object spectrograph for the Extremely Large Telescope (ELT). It is planned to cover the wavelength range from 460 nm to 1800 nm with 5 visible spectrographs and 5 near-infrared spectrographs. The ELT is far from diffraction limited in the visible wavelength range. Rather than developing a large and complex AO system, it was decided that the instrument will be seeing limited in the visible. Spot sizes are therefore about 2.8 mm in diameter in the ELT focal plane, and need to be sampled by multiple fibers with large core diameter. As a result, large optics is required to achieve the science requirements on spectral resolution, bandwidth and multiplex. We work in close collaboration with manufacturers to design an instrument that is feasible and meets the scientific requirements.

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A. W. Janssen, E. Sokolova, J. Pragt, J. Kragt, Ramon Navarro, Niels Tromp, E. Fitzsimons, M. Rodrigues, M. Larrieu, A. Kelz, T. Morris, P. Jagourel, F. Chemla, L. Kaper, and G. Dalton " Trade-offs in the visible spectrograph of the ELT instrument MOSAIC", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107029F (10 July 2018); https://doi.org/10.1117/12.2313302

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