Modeling wide-field telescopes in presence of misalignments: an application to the Vera C. Rubin Observatory

Salvatore Savarese; Pietro Schipani; Giuliana Fiorentino; Laura Schreiber; Giacomo Basile; Giulio Capasso; Mirko Colapietro; Sergio D'Orsi; Laurent Marty; Francesco Perrotta

doi:10.1117/12.2630248

25 August 2022 Modeling wide-field telescopes in presence of misalignments: an application to the Vera C. Rubin Observatory

Salvatore Savarese, Pietro Schipani, Giuliana Fiorentino, Laura Schreiber, Giacomo Basile, Giulio Capasso, Mirko Colapietro, Sergio D'Orsi, Laurent Marty, Francesco Perrotta

Author Affiliations +

Proceedings Volume 12187, Modeling, Systems Engineering, and Project Management for Astronomy X; 1218719 (2022) https://doi.org/10.1117/12.2630248
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

An accurate alignment of the optical surfaces of a telescope is essential to guarantee an optimal image quality since even small displacements introduce aberrations increasing towards the edges of the field. This effect is especially detrimental in wide-field imagers. This work proposes the derivation of a fully analytical model of the wavefront error as a function of the most likely system misalignments. An accurate response of the telescope under a predefined set of misaligned conditions is obtained through simulations in Zemax OpticStudio. The resulting data is combined through an integrated modeling approach, obtaining a map of the aberrations as a function of a vector of perturbations applied to the optical system. The analytical wavefront error allows for a quick and accurate assessment of the theoretical PSF across the entire image field. As a case study, the example of the Rubin Observatory is adopted, featuring an 8.4m primary mirror and a large field of view.

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Salvatore Savarese, Pietro Schipani, Giuliana Fiorentino, Laura Schreiber, Giacomo Basile, Giulio Capasso, Mirko Colapietro, Sergio D'Orsi, Laurent Marty, and Francesco Perrotta "Modeling wide-field telescopes in presence of misalignments: an application to the Vera C. Rubin Observatory", Proc. SPIE 12187, Modeling, Systems Engineering, and Project Management for Astronomy X, 1218719 (25 August 2022); https://doi.org/10.1117/12.2630248

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