4MOST low resolution spectrograph final design

Patrick Caillier; Samuel C. Barden; Olga Bellido-Tirado; Didier Boudon; Eric Daguisé; Steffen Frey; Florence Laurent; Jean-Emmanuel Migniau; Arlette Pécontal; Johan Richard; Allar Saviauk

doi:10.1117/12.2313604

11 July 2018 4MOST low resolution spectrograph final design

Patrick Caillier, Samuel C. Barden, Olga Bellido-Tirado, Didier Boudon, Eric Daguisé, Steffen Frey, Florence Laurent, Jean-Emmanuel Migniau, Arlette Pécontal, Johan Richard, Allar Saviauk

Author Affiliations +

Proceedings Volume 10702, Ground-based and Airborne Instrumentation for Astronomy VII; 1070287 (2018) https://doi.org/10.1117/12.2313604
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

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 preliminary design of 4MOST features 2436 fibres split into lowresolution (1624 fibres, 370-950 nm, R < 4000) and high-resolution spectrographs (812 fibres, three arms, ~44-69 nm coverage each, R < 18000) with a fibre positioner and covering an hexagonal field of view of ~4.1 deg². 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 Final Design Phase with an expected start of science operations in 2022. In this paper, the final optomechanical design and performances of 4MOST Low Resolution Spectrograph will be presented. It has been designed by CRAL for 4MOST FDR held in May, 2018. Special emphasis will be put on the technical requirements of individual optics and the mechanical design with its associated FEA.

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Patrick Caillier, Samuel C. Barden, Olga Bellido-Tirado, Didier Boudon, Eric Daguisé, Steffen Frey, Florence Laurent, Jean-Emmanuel Migniau, Arlette Pécontal, Johan Richard, and Allar Saviauk "4MOST low resolution spectrograph final design", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 1070287 (11 July 2018); https://doi.org/10.1117/12.2313604

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KEYWORDS

Lawrencium

Sensors

Charge-coupled devices

Spectral resolution

Light scattering

Diffusion

Spectrographs

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