10 August 2010 Stray light analysis and optimization of the ASPIICS/PROBA-3 formation flying solar coronagraph
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Abstract
PROBA-3 is a technology mission devoted to the in-orbit demonstration of formation flying techniques and technologies. PROBA-3 will implement a giant coronagraph (called ASPIICS) that will both demonstrate and exploit the capabilities and performances of formation flying. ASPIICS is distributed on two spacecrafts separated by 150m, one hosting the external occulting disk and the other the optical part of the coronagraph. This part implements a three-mirror-anastigmat (TMA) telescope. Its pupil is placed about 800mm in front of the primary mirror, a solution allowing an efficient baffling and a high reduction of the stray light inside the instrument. A complete stray light analysis of the TMA has been carried out to design the baffles and to establish the required roughness of the mirrors. The analysis has been performed in two steps: first, by calculating the diffraction pattern behind the occulter due to an extended monochromatic source having the diameter of the Sun; second, by propagating this diffraction pattern, through all the telescope optical components, to the prime focal plane. The results obtained are described in this article.
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A. Mazzoli, F. Landini, S. Vives, P. Lamy, J.P. Halain, P. Rochus, "Stray light analysis and optimization of the ASPIICS/PROBA-3 formation flying solar coronagraph", Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 773146 (10 August 2010); doi: 10.1117/12.857497; https://doi.org/10.1117/12.857497
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