Active optics strategy for the alignment and operation of the European Solar Telescope

M. Belío-Asin; J. Sánchez-Capuchino; A. Mato; J. M. González-Cava; J. Cozar-Castellano; M. Soler; I. Ferro; M. Núñez Cagigal; M. Barreto

doi:10.1117/12.2628791

29 August 2022 Active optics strategy for the alignment and operation of the European Solar Telescope

M. Belío-Asin, J. Sánchez-Capuchino, A. Mato, J. M. González-Cava, J. Cozar-Castellano, M. Soler, I. Ferro , M. Núñez Cagigal, M. Barreto

Author Affiliations +

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 121883E (2022) https://doi.org/10.1117/12.2628791
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

The European Solar Telescope (EST) is an on-axis 4.2-meter solar telescope, the largest solar telescope ever built in Europe. While operating, environmental effects, such as gravity, wind buffeting or thermal loads, will generate wavefront errors that require to be corrected. For this reason, the EST team is developing an active optics strategy to ensure that quasi-static aberrations resulting from optical misalignments are minimised and that the remaining residual errors are small enough to maintain the image quality requirements. A hexapod, with five degrees of freedom (tilt, centring and focus), will be mounted on the secondary mirror to actively control the position of M2 and provide the proper alignment of the telescope. This contribution outlines the step-by-step analysis of the active optics system developed to establish the procedure to be implemented in EST. The sensitivity matrix, obtained from the optical model, that will be needed for adjustments during operation is shown. In addition to the optical elements that will be involved during the strategy, as well as their particular movements, the effects of these adjustments and the final residuals that will remain, ensuring a seeinglimited performance.

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M. Belío-Asin, J. Sánchez-Capuchino, A. Mato, J. M. González-Cava, J. Cozar-Castellano, M. Soler, I. Ferro , M. Núñez Cagigal, and M. Barreto "Active optics strategy for the alignment and operation of the European Solar Telescope", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 121883E (29 August 2022); https://doi.org/10.1117/12.2628791

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