Toward ARIEL’s primary mirror

Tozzi, A.; Brucalassi, Anna; Canestrari, R.; Chioetto, Paolo; Vecchio, Ciro Del; Carbonaro, Luca; Cortecchia, Fausto; Diolaiti, Emiliano; Eccleston, Paul; Falcini, G.; Ferruzzi, D.; Gottini, Daniele; Guerriero, Elisa; Iuzzolino, M.; Lilli, Riccardo; Lombini, Matteo; Malaguti, G.; Micela, G.; Miceli, Federico; Morgante, G.; Pace, E.; Pascale, Enzo; Piazzolla, Raffaele; Preti, Giampaolo; Salatti, M.; Scippa, Antonio; Tinetti, Giovanna; Tommasi, E.; Vernani, Dervis; Zuppella, Paola

doi:10.1117/12.2628906

Cited by 3 publications

References 2 publications

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Planning the integration and test of a space telescope with a 1 m aluminum primary mirror: the Ariel mission case

Chioetto,

Araiza-Durán,

Barozzi

et al. 2024

Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave

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Ariel (Atmospheric Remote-Sensing Infrared Exoplanet Large Survey) is ESA's M4 mission of the "Cosmic Vision" program, with launch scheduled for 2029. Its purpose is to conduct a survey of the atmospheres of known exoplanets through transit spectroscopy.Ariel is based on a 1 m class telescope optimized for spectroscopy in the waveband between 1.95 and 7.8 µm, operating at cryogenic temperatures in the range 40-50 K. The Ariel Telescope is an off-axis, unobscured Cassegrain design, with a parabolic recollimating tertiary mirror and a flat folding mirror directing the output beam parallel to the optical bench. The secondary mirror is mounted on a rototranslating stage for adjustments during the mission. The mirrors and supporting structures are all realized in an aerospace-grade aluminum alloy T6061 for ease of manufacturing and thermalization. The low stiffness of the material, however, poses unique challenges to integration and alignment.

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Planning the integration and test of a space telescope with a 1 m aluminum primary mirror: the Ariel mission case

Chioetto,

Araiza-Durán,

Barozzi

et al. 2024

Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave

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Aluminum based large telescopes: the ARIEL mission case

Picchi,

Tozzi,

Brucalassi

et al. 2024

Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave

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Ariel (Atmospheric Remote-Sensing Infrared Exoplanet Large Survey) is the adopted M4 mission of ESA "Cosmic Vision" program. Its purpose is to conduct a survey of the atmospheres of known exoplanets through transit spectroscopy. Launch is scheduled for 2029. Ariel scientific payload consists of an off-axis, unobscured Cassegrain telescope feeding a set of photometers and spectrometers in the waveband between 0.5 and 7.8 µm, and operating at cryogenic temperatures.

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High precision polishing of aluminum alloy mirrors through a combination of magnetorheological finishing and chemical mechanical polishing

Bai,

Zhang,

et al. 2024

Opt. Express

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After the aluminum alloy mirror machined by single point diamond turning (SPDT), the residual tool marks and surface accuracy of the aluminum alloy mirror cannot meet the requirements of visible or ultraviolet light system. In this study, a processing method combining magnetorheological finishing (MRF) and chemical mechanical polishing (CMP) is proposed to realize the polishing of aluminum alloy mirrors with high efficiency, high precision and high-quality. Firstly, the properties and composition of passivation layer after MRF were analyzed and the polishing performance of acidic, neutral and alkaline alumina polishing fluid on passivation layer were investigated based on the computer numerical control (CNC) polishing equipment. Based on the experimental results, a new acidic nano-silica polishing fluid which is suitable for the efficient and high-quality removal of passivation layers on aluminum alloy surfaces was developed. Finally, a combined approach of MRF-CMP was used to the directly polishing of a rapidly solidified aluminum mirror (RSA-6061) with a diameter of 100 mm after SPDT. With two iterative of MRF-CMP polishing in 220 minutes, the surface accuracy of the aluminum alloy mirror was improved from 0.1λ (λ=632.8 nm) to 0.024λ, and the surface roughness (Ra) decreased from 3.6 nm to 1.38 nm. The experiment results manifest that high precision, and high-quality aluminum alloy mirror can be achieved by MRF-CMP method with the new developed acid nano-silica polishing fluid and suitable MR polishing fluid. The research results will provide a new strategy for ultra-precision direct polishing of aluminum alloy mirrors and will also give the important technical support for the extensive use of aluminum alloy mirror in visible light and ultraviolet optical systems.

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Toward ARIEL’s primary mirror

Cited by 3 publications

References 2 publications

Planning the integration and test of a space telescope with a 1 m aluminum primary mirror: the Ariel mission case

Planning the integration and test of a space telescope with a 1 m aluminum primary mirror: the Ariel mission case

Aluminum based large telescopes: the ARIEL mission case

High precision polishing of aluminum alloy mirrors through a combination of magnetorheological finishing and chemical mechanical polishing

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