MOONS, the next ESO VLT’s multi-object spectrograph: the field corrector and the rotating front end

Alexandre Cabral; Manuel Abreu; João M. P. Coelho; Pedro Santos; Antonio Oliveira; Inês Leite; Jose Afonso; Phil Rees; William Taylor; Stephen Watson; David Lee; David Atkinson; Óscar González; Alasdair Fairley; Ian Bryson; Isabelle Guinouard; Michele Cirasuolo

doi:10.1117/12.2561412

13 December 2020 MOONS, the next ESO VLT’s multi-object spectrograph: the field corrector and the rotating front end

Alexandre Cabral, Manuel Abreu, João M. P. Coelho, Pedro Santos, Antonio Oliveira, Inês Leite, Jose Afonso, Phil Rees, William Taylor, Stephen Watson, David Lee, David Atkinson, Óscar González, Alasdair Fairley, Ian Bryson, Isabelle Guinouard, Michele Cirasuolo

Author Affiliations +

Proceedings Volume 11447, Ground-based and Airborne Instrumentation for Astronomy VIII; 114478D (2020) https://doi.org/10.1117/12.2561412
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

MOONS will be the next Multi-Object Optical and Near-infrared Spectrograph for the Very Large Telescope, able to simultaneously observe 1000 targets, feeding a set of optical fibres which can be placed at user-specified locations on the Nasmyth focal plane using individual robotic positioners. The sub-fields thus selected are then driven by the fibres into two identical cryogenic spectrographs mounted on the Nasmyth platform of one of the ESO VLT 8 m telescopes. The instrument will provide both medium and high-resolution spectral coverage across the wavelength range of 0.65 μm to 1.8 μm. In this paper we will describe the two components that interface with the telescope: the MOONS Field Corrector (FC) and the Rotating Front End (RFE) Assemblies. The FC optics will correct the off-axis aberrations of the telescope, as well as determining the shape of the focal surface and the pupil location. The RFE assembly consists of a rotating part, which will be mounted on the VLT Nasmyth Rotator, and be connected to the two static Spectrographs via fibre assemblies, and all the sub-systems that give support to the fibre positioning, metrology and calibration units.

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Alexandre Cabral, Manuel Abreu, João M. P. Coelho, Pedro Santos, Antonio Oliveira, Inês Leite, Jose Afonso, Phil Rees, William Taylor, Stephen Watson, David Lee, David Atkinson, Óscar González, Alasdair Fairley, Ian Bryson, Isabelle Guinouard, and Michele Cirasuolo "MOONS, the next ESO VLT’s multi-object spectrograph: the field corrector and the rotating front end", Proc. SPIE 11447, Ground-based and Airborne Instrumentation for Astronomy VIII, 114478D (13 December 2020); https://doi.org/10.1117/12.2561412

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