Mechanical optimisation of the M1 dish of the small-sized telescope of the future Cherenkov Telescope Array

Jean-Laurent Dournaux; Frédéric Bouley; Emma Rébert; Jean-Michel Huet; Fatima De Frondat; Hélène Sol; Primo Attinà; Carmelo Gargano; Gianpietro Marchiori; Giovanni Pareschi; Salvatore Scuderi; Matteo Spinola; Gianpiero Tagliaferri; Gino Tosti; Alessio Trois

doi:10.1117/12.2627853

29 August 2022 Mechanical optimisation of the M1 dish of the small-sized telescope of the future Cherenkov Telescope Array

Jean-Laurent Dournaux, Frédéric Bouley, Emma Rébert, Jean-Michel Huet, Fatima De Frondat, Hélène Sol, Primo Attinà, Carmelo Gargano, Gianpietro Marchiori, Giovanni Pareschi, Salvatore Scuderi, Matteo Spinola, Gianpiero Tagliaferri, Gino Tosti, Alessio Trois

Author Affiliations +

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 1218831 (2022) https://doi.org/10.1117/12.2627853
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

The Small Sized Telescope (SST) is one of the three types of telescopes that will constitute the Cherenkov Telescope Array (CTA). For the CTA Southern site, 37 SST will be realized for the first alpha CTA configuration. Their design is based on the ASTRI-Horn dual-mirror telescope. Some modifications of the design are currently under study searching for possible improvements of the behaviour of the telescope. Amongst them, there are studies on the primary mirror dish (M1 Dish) led by a team of the Observatoire de Paris. The main purpose of these studies is to optimize the mass stiffness ratio of this structure. It means reducing its total mass while keeping its performance, mainly its stiffness, and taking into account existing constraints related to dependent fixed subsystems (counterweight, secondary mirror...) or environment (gravity, wind). This problem can be described as a classical optimization problem in the way it aims at finding an optimal mass distribution by minimizing the compliance with a constraint of mass reduction and under given boundary conditions. This methodology, previously used by the Observatoire de Paris for the design of lightweight mirrors and of components of another Cherenkov telescope, is applied to propose an alternative option to the ASTRI-Horn baseline design of the M1 Dish. Its lays on the use of structural optimization tools, which can help to get more quickly an accurate mass distribution and to improve the design process by reducing the number of iterations between phases of design definition under computer-aided design (CAD) and phases of design validation under finite-element analysis. This methodology and the corresponding results are presented in this paper.

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Jean-Laurent Dournaux, Frédéric Bouley, Emma Rébert, Jean-Michel Huet, Fatima De Frondat, Hélène Sol, Primo Attinà, Carmelo Gargano, Gianpietro Marchiori, Giovanni Pareschi, Salvatore Scuderi, Matteo Spinola, Gianpiero Tagliaferri, Gino Tosti, and Alessio Trois "Mechanical optimisation of the M1 dish of the small-sized telescope of the future Cherenkov Telescope Array", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 1218831 (29 August 2022); https://doi.org/10.1117/12.2627853

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