Preliminary design of the Adaptive Secondary Mirror for the European Solar Telescope

Stefan Kuiper; Arjo Bos; Jan de Vreugd; Gert Witvoet; Bert Dekker; Fred Kamphues; Geert Slegtenhorst; Wouter Jonker; Matthew Maniscalco; Bruno Femenía-Castella; Miguel Núñez Cagigal; Jonai Bienes Pérez; Juan Cózar-Castellano; Jose Manuel González-Cava; Angel Mato; Alejandro Mahy Soler Trujillo; Nauzet Vega Reyes

doi:10.1117/12.2629495

29 August 2022 Preliminary design of the Adaptive Secondary Mirror for the European Solar Telescope

Stefan Kuiper, Arjo Bos, Jan de Vreugd, Gert Witvoet, Bert Dekker, Fred Kamphues, Geert Slegtenhorst, Wouter Jonker, Matthew Maniscalco, Bruno Femenía-Castella, Miguel Núñez Cagigal, Jonai Bienes Pérez, Juan Cózar-Castellano, Jose Manuel González-Cava, Angel Mato, Alejandro Mahy Soler Trujillo, Nauzet Vega Reyes

Author Affiliations +

Proceedings Volume 12185, Adaptive Optics Systems VIII; 1218528 (2022) https://doi.org/10.1117/12.2629495
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

This paper describes the preliminary design of the Adaptive Secondary Mirror (ASM) for the European Solar Telescope (EST), as designed by TNO. This ASM will contain 1950 actuators over an optical aperture of Ø80cm. The mirror-shell of this ASM is concave with a radius of 2.156m and has a thickness of 2.5mm. To cope with the high optical heat-load, the mirror shell will be cooled actively by means of conduction through a small (0.3mm) airgap between the mirror shell and the cooled SiC supporting structure. One of the unique characteristics of this ASM are the highly efficient actuators by TNO, delivering 30N Peak-to-Valley of linear force range within a packaging of Ø15x40mm. These actuators are based on the proven electromagnetic actuation principle by TNO but have been significantly redesigned to improve manufacturability and integration. The actuators are interfaced to the mirror shell via a stiff carbon fiber strut assembly and are designed to be replaceable during off-telescope maintenance. For overall alignment of the ASM a hexapod is used, while a faster tip-tilt stage is used to compensate for tip-tilt disturbances up to 20Hz bandwidth. The optical performance of the ASM under various environmental conditions has been extensively studied with Finite-Element-Analysis. To verify the performances of the actuator and the cooling systems, an actuator and thermal- breadboard are being constructed.

Conference Presentation

Citation Download Citation

Stefan Kuiper, Arjo Bos, Jan de Vreugd, Gert Witvoet, Bert Dekker, Fred Kamphues, Geert Slegtenhorst, Wouter Jonker, Matthew Maniscalco, Bruno Femenía-Castella, Miguel Núñez Cagigal, Jonai Bienes Pérez, Juan Cózar-Castellano, Jose Manuel González-Cava, Angel Mato, Alejandro Mahy Soler Trujillo, and Nauzet Vega Reyes "Preliminary design of the Adaptive Secondary Mirror for the European Solar Telescope", Proc. SPIE 12185, Adaptive Optics Systems VIII, 1218528 (29 August 2022); https://doi.org/10.1117/12.2629495

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available