Heat treatment procedure of the aluminium 6061-T651 for the Ariel telescope mirrors.

Elisa Guerriero; Paolo Chioetto; Andrea Tozzi; Paola Zuppella; Rodolfo Canestrari; Anna Brucalassi; Marcella Iuzzolino; Debora Ferruzzi; Antonio Scippa; Ciro Del Vecchio; Gilberto Falcini; Luca Carbonaro; Gianluca Morgante; Fausto Cortecchia; Emiliano Diolaiti; Paul Eccleston; Matteo Lombini; Giuseppe Malaguti; Giuseppina Micela; Emanuele Pace; Enzo Pascale; Raffaele Piazzolla; Giampaolo Preti; Mario Salatti; Giovanna Tinetti; Elisabetta Tommasi

doi:10.1117/12.2628178

27 August 2022 Heat treatment procedure of the aluminium 6061-T651 for the Ariel telescope mirrors.

Elisa Guerriero, Paolo Chioetto, Andrea Tozzi, Paola Zuppella, Rodolfo Canestrari, Anna Brucalassi, Marcella Iuzzolino, Debora Ferruzzi, Antonio Scippa, Ciro Del Vecchio, Gilberto Falcini, Luca Carbonaro, Gianluca Morgante, Fausto Cortecchia, Emiliano Diolaiti, Paul Eccleston, Matteo Lombini, Giuseppe Malaguti, Giuseppina Micela, Emanuele Pace, Enzo Pascale, Raffaele Piazzolla, Giampaolo Preti, Mario Salatti, Giovanna Tinetti, Elisabetta Tommasi

Author Affiliations +

Proceedings Volume 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave; 1218014 (2022) https://doi.org/10.1117/12.2628178
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

The Atmospheric Remote-Sensing Infrared Exoplanet Large Survey (Ariel) is the M4 mission adopted by ESA’s ”Cosmic Vision” program. Its launch is scheduled for 2029. The purpose of the mission is the study of exoplanetary atmospheres on a target of ∼ 1000 exoplanets. Ariel scientific payload consists of an off-axis, unobscured Cassegrain telescope. The light is directed towards a set of photometers and spectrometers with wavebands between 0.5 and 7.8 µm and operating at cryogenic temperatures. The Ariel Space Telescope consists of a primary parabolic mirror with an elliptical aperture of 1.1· 0.7 m, followed by a hyperbolic secondary, a parabolic collimating tertiary and a flat-folding mirror directing the output beam parallel to the optical bench; all in bare aluminium. The choice of bare aluminium for the realization of the mirrors is dictated by several factors: maximizing the heat exchange, reducing the costs of materials and technological advancement. To date, an aluminium mirror the size of Ariel’s primary has never been made. The greatest challenge is finding a heat treatment procedure that stabilizes the aluminium, particularly the Al6061T651 Laminated alloy. This paper describes the study and testing of the heat treatment procedure developed on aluminium samples of different sizes (from 50mm to 150mm diameter), on 0.7m diameter mirror, and discusses future steps.

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Elisa Guerriero, Paolo Chioetto, Andrea Tozzi, Paola Zuppella, Rodolfo Canestrari, Anna Brucalassi, Marcella Iuzzolino, Debora Ferruzzi, Antonio Scippa, Ciro Del Vecchio, Gilberto Falcini, Luca Carbonaro, Gianluca Morgante, Fausto Cortecchia, Emiliano Diolaiti, Paul Eccleston, Matteo Lombini, Giuseppe Malaguti, Giuseppina Micela, Emanuele Pace, Enzo Pascale, Raffaele Piazzolla, Giampaolo Preti, Mario Salatti, Giovanna Tinetti, and Elisabetta Tommasi "Heat treatment procedure of the aluminium 6061-T651 for the Ariel telescope mirrors.", Proc. SPIE 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 1218014 (27 August 2022); https://doi.org/10.1117/12.2628178

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