29 July 2016 Radiation, Thermal Gradient and Weight: a threefold dilemma for PLATO
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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.
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Demetrio Magrin, Demetrio Magrin, Roberto Ragazzoni, Roberto Ragazzoni, Giordano Bruno, Giordano Bruno, Daniele Piazza, Daniele Piazza, Francesco Borsa, Francesco Borsa, Mauro Ghigo, Mauro Ghigo, Valery Mogulsky, Valery Mogulsky, Maria Bergomi, Maria Bergomi, Federico Biondi, Federico Biondi, Simonetta Chinellato, Simonetta Chinellato, Marco Dima, Marco Dima, Jacopo Farinato, Jacopo Farinato, Davide Greggio, Davide Greggio, Marco Gullieuszik, Marco Gullieuszik, Luca Marafatto, Luca Marafatto, Valentina Viotto, Valentina Viotto, Matteo Munari, Matteo Munari, Isabella Pagano, Isabella Pagano, Daniela Sicilia, Daniela Sicilia, Stefano Basso, Stefano Basso, Daniele Spiga, Daniele Spiga, Timothy Bandy, Timothy Bandy, Mathias Brändli, Mathias Brändli, Willy Benz, Willy Benz, Thierry De Roche, Thierry De Roche, Martin Rieder, Martin Rieder, Alexis Brandeker, Alexis Brandeker, Maximilian Klebor, Maximilian Klebor, Mario Schweitzer, Mario Schweitzer, Matthias Wieser, Matthias Wieser, Anders Erikson, Anders Erikson, Heike Rauer, Heike Rauer, } "Radiation, Thermal Gradient and Weight: a threefold dilemma for PLATO", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 990430 (29 July 2016); doi: 10.1117/12.2232579; https://doi.org/10.1117/12.2232579


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