4MOST low resolution spectrographs AIT at AIP

Florence Laurent; Didier Boudon; Eric Daguisé; Karen Disseau; Steffen Frey; Rémi Giroud; Aurélien Jarno; Jens-Kristian Krogager; Jean-Emmanuel Migniau; Matthew Lehnert; Arlette Pecontal; Emmanuel Pécontal; Alban Remillieux; Johan Richard; Pasko Roje; Carlos E. Rodriguez Alvarez; Deborah Sobiella

doi:10.1117/12.3020061

18 July 2024 4MOST low resolution spectrographs AIT at AIP

Florence Laurent, Didier Boudon, Eric Daguisé, Karen Disseau, Steffen Frey, Rémi Giroud, Aurélien Jarno, Jens-Kristian Krogager, Jean-Emmanuel Migniau, Matthew Lehnert, Arlette Pecontal, Emmanuel Pécontal, Alban Remillieux, Johan Richard, Pasko Roje, Carlos E. Rodriguez Alvarez, Deborah Sobiella

Author Affiliations +

Proceedings Volume 13096, Ground-based and Airborne Instrumentation for Astronomy X; 130966C (2024) https://doi.org/10.1117/12.3020061
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

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, high-energy 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. The design of 4MOST features 2436 fibres split into two low-resolution spectrographs (1624 fibres, three arms, 370-950 nm, R > 4000) and one high-resolution spectrograph (812 fibres, three arms, ~44-69 nm coverage each, R > 18000). The fibre positioner covers a hexagonal field of view of ~4.1 deg². The fibers are 85μm core with an output beam at f/3. CRAL has the full responsibility of the two Low Resolution Spectrographs. Each of them is composed of a 200mm beam for an off-axis collimator associated to its Schmidt corrector, three “color” arms hosting f/1.73 cameras with standard 6k x 6k 15μm pixel CCD detectors. The local acceptance reviews at CRAL for the both 4MOST Low Resolution Spectrographs were successfully passed respectively in December 2021 and October 2022. In 2022, two SPIE papers described the process performed at CRAL from the integration and alignment of the sub-assemblies up to the procedures developed to test the spectrograph and demonstrate its compliance with the requirements. 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.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Florence Laurent, Didier Boudon, Eric Daguisé, Karen Disseau, Steffen Frey, Rémi Giroud, Aurélien Jarno, Jens-Kristian Krogager, Jean-Emmanuel Migniau, Matthew Lehnert, Arlette Pecontal, Emmanuel Pécontal, Alban Remillieux, Johan Richard, Pasko Roje, Carlos E. Rodriguez Alvarez, and Deborah Sobiella "4MOST low resolution spectrographs AIT at AIP", Proc. SPIE 13096, Ground-based and Airborne Instrumentation for Astronomy X, 130966C (18 July 2024); https://doi.org/10.1117/12.3020061

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