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Proceedings Paper

Radiation, Thermal Gradient and Weight: a threefold dilemma for PLATO
Author(s): Demetrio Magrin; Roberto Ragazzoni; Giordano Bruno; Daniele Piazza; Francesco Borsa; Mauro Ghigo; Valery Mogulsky; Maria Bergomi; Federico Biondi; Simonetta Chinellato; Marco Dima; Jacopo Farinato; Davide Greggio; Marco Gullieuszik; Luca Marafatto; Valentina Viotto; Matteo Munari; Isabella Pagano; Daniela Sicilia; Stefano Basso; Daniele Spiga; Timothy Bandy; Mathias Brändli; Willy Benz; Thierry De Roche; Martin Rieder; Alexis Brandeker; Maximilian Klebor; Mario Schweitzer; Matthias Wieser; Anders Erikson; Heike Rauer
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Paper Abstract

The project PLAnetary Transits and Oscillations of stars (PLATO) is one of the selected medium class (M class) missions in the framework of the ESA Cosmic Vision 2015-2025 program. The mean scientific goal of PLATO is the discovery and study of extrasolar planetary systems by means of planetary transits detection. The opto mechanical subsystem of the payload is made of 32 normal telescope optical units (N-TOUs) and 2 fast telescope optical units (FTOUs). The optical configuration of each TOU is an all refractive design based on six properly optimized lenses. In the current baseline, in front of each TOU a Suprasil window is foreseen. The main purposes of the entrance window are to shield the following lenses from possible damaging high energy radiation and to mitigate the thermal gradient that the first optical element will experience during the launch from ground to space environment. In contrast, the presence of the window increases the overall mass by a non-negligible quantity. We describe here the radiation and thermal analysis and their impact on the quality and risks assessment, summarizing the trade-off process with pro and cons on having or dropping the entrance window in the optical train.

Paper Details

Date Published: 29 July 2016
PDF: 8 pages
Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 990430 (29 July 2016); doi: 10.1117/12.2232579
Show Author Affiliations
Demetrio Magrin, INAF - Osservatorio Astronomico di Padova (Italy)
Roberto Ragazzoni, INAF - Osservatorio Astronomico di Padova (Italy)
Giordano Bruno, Univ. of Bern (Switzerland)
Daniele Piazza, Univ. of Bern (Switzerland)
Francesco Borsa, INAF - Osservatorio Astronomico di Brera (Italy)
Mauro Ghigo, INAF - Osservatorio Astronomico di Brera (Italy)
Valery Mogulsky, OHB System AG (Germany)
Maria Bergomi, INAF - Osservatorio Astronomico di Padova (Italy)
Federico Biondi, INAF - Osservatorio Astronomico di Padova (Italy)
Simonetta Chinellato, INAF - Osservatorio Astronomico di Padova (Italy)
Marco Dima, INAF - Osservatorio Astronomico di Padova (Italy)
Jacopo Farinato, INAF - Osservatorio Astronomico di Padova (Italy)
Davide Greggio, INAF - Osservatorio Astronomico di Padova (Italy)
Univ. degli Studi di Padova (Italy)
Marco Gullieuszik, INAF - Osservatorio Astronomico di Padova (Italy)
Luca Marafatto, INAF - Osservatorio Astronomico di Padova (Italy)
Valentina Viotto, INAF - Osservatorio Astronomico di Padova (Italy)
Matteo Munari, INAF - Osservatorio Astrofisico di Catania (Italy)
Isabella Pagano, INAF - Osservatorio Astrofisico di Catania (Italy)
Daniela Sicilia, INAF - Osservatorio Astrofisico di Catania (Italy)
Stefano Basso, INAF - Osservatorio Astronomico di Brera (Italy)
Daniele Spiga, INAF - Osservatorio Astronomico di Brera (Italy)
Timothy Bandy, Univ. of Bern (Switzerland)
Mathias Brändli, Univ. of Bern (Switzerland)
Willy Benz, Univ. of Bern (Switzerland)
Thierry De Roche, Univ. of Bern (Switzerland)
Martin Rieder, Univ. of Bern (Switzerland)
Alexis Brandeker, Stockholm Univ. (Sweden)
Maximilian Klebor, OHB System AG (Germany)
Mario Schweitzer, OHB System AG (Germany)
Matthias Wieser, OHB System AG (Germany)
Anders Erikson, DLR - Institut für Planetenforschung (Germany)
Heike Rauer, DLR - Institut für Planetenforschung (Germany)


Published in SPIE Proceedings Vol. 9904:
Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave
Howard A. MacEwen; Giovanni G. Fazio; Makenzie Lystrup; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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