Optimization of the Ariel primary mirror

Ciro Del Vecchio; Luca Carbonaro; Anna Brucalassi; Andrea Tozzi; Daniele Gottini; Antonio Scippa; Emanuele Pace; Giuseppe Malaguti; Giuseppina Micela; Giuanluca Morgante; Mauro Focardi; Enzo Pascale; Giampaolo Preti; Paola Zuppella; Mario Salatti; Raffaele Piazzolla; Elisabetta Tommasi Di Vigano; Luca Naponiello; Paolo Chioetto

doi:10.1117/12.2629819

27 August 2022 Optimization of the Ariel primary mirror

Ciro Del Vecchio, Luca Carbonaro, Anna Brucalassi, Andrea Tozzi, Daniele Gottini, Antonio Scippa, Emanuele Pace, Giuseppe Malaguti, Giuseppina Micela, Giuanluca Morgante, Mauro Focardi, Enzo Pascale, Giampaolo Preti, Paola Zuppella, Mario Salatti, Raffaele Piazzolla, Elisabetta Tommasi Di Vigano, Luca Naponiello, Paolo Chioetto

Author Affiliations +

Proceedings Volume 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave; 1218041 (2022) https://doi.org/10.1117/12.2629819
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

The primary mirror of the Ariel space telescope (an ESA M class mission aimed at the study of exoplanets, scheduled for launch in 2029) is an elliptical off-axis paraboloid. Like the entire telescope, it is built of aluminum. As a massive part of the payload, as well as one of the most delicate components of the telescope, this mirror has to be accurately designed, in order to minimize its mass while not degrading its optical performances. This paper discusses the optimization study of the primary mirror of Ariel. Starting from its optical and geometrical specifications, we have run an iterative process based on FEA dynamic analyses, in order to compute the first ”free-free” eigenfrequencies while varying the three fundamental parameters of the honeycomb structure of the mirror - the thickness of the ribs, the outer edge, and the reflecting surface. Later, the optimization routine has been improved by adding the honeycomb geometry as a variable parameter. As a result, the best configurations is identified as the ones giving the higher ratios of the first relevant eigenfrequency divided by the mass.

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Ciro Del Vecchio, Luca Carbonaro, Anna Brucalassi, Andrea Tozzi, Daniele Gottini, Antonio Scippa, Emanuele Pace, Giuseppe Malaguti, Giuseppina Micela, Giuanluca Morgante, Mauro Focardi, Enzo Pascale, Giampaolo Preti, Paola Zuppella, Mario Salatti, Raffaele Piazzolla, Elisabetta Tommasi Di Vigano, Luca Naponiello, and Paolo Chioetto "Optimization of the Ariel primary mirror", Proc. SPIE 12180, Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, 1218041 (27 August 2022); https://doi.org/10.1117/12.2629819

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