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Straylight analysis on aspiics, Proba-3 coronagraph
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SYSNO ASEP 0548847 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Straylight analysis on aspiics, Proba-3 coronagraph Author(s) Galy, C. (BE)
Thizy, C. (BE)
Stockman, Y. (BE)
Galano, D. (NL)
Rougeot, R. (BE)
Melich, Radek (UFP-V) RID
Shestov, S. V. (RU)
Landini, F. (IT)
Zukhov, A. (IT)
Kirschner, V. (NL)
Horodyská, Petra (UFP-V)
Fineschi, S. (IT)Number of authors 12 Article number 111802H Source Title Proceedings of SPIE The International Society for Optical Engineering. - Bellingham : SPIE, 2018 - ISSN 0277-786X - ISBN 9781510621350 Pages roč. 11180 (2018) Number of pages 10 s. Publication form Online - E Action International Conference on Space Optics Event date 09.10.2018 - 12.10.2018 VEvent location Chania Country GR - Greece Event type WRD Language eng - English Country US - United States Keywords aspiics ; Coronagraph ; csl ; External occulter ; Formation flying ; Straylight Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) Institutional support UFP-V - RVO:61389021 UT WOS 000512543800083 EID SCOPUS 85072662770 DOI https://doi.org/10.1117/12.2536008 Annotation PROBA-3 is a mission devoted to the in-orbit demonstration (IOD) of precise formation flying (F) techniques and technologies for future ESA missions. The mission includes two spacecraft. One of them will act as an external occulter for scientific observations of the solar corona from the other spacecraft, which will hold the ASPIICS coronagraph instrument, under CSL responsibility. The ASPIICS instrument on PROBA-3 looks at the solar corona through a refractive telescope, able to select 3 different spectral bands: Fe XIV line @ 530.4nm, He I D3 line @587.7nm, and the white-light spectral band [540 - 570nm]. The external occulter being located at ∼ 150 meters from the instrument entrance, will allow ASPIICS to observe the corona really close to the solar limb, probably closer than any internally or externally occulted coronagraph ever observed. This paper will present the straylight model and analyses carried out by CSL. A first specificity of the analysis is that the scene on the useful Field of View (FOV) is the solar corona which has a brightness dynamic range as high as 103 between the close corona, close to 1 solar radius (Rsun), and the „distant” corona around 3RSun. The specifications are very stringent for this type of instrument. A consensus was found and will be presented regarding the expected straylight within the FOV. It will also be shown that to achieve realistic estimations it is required to take into account the exact location of the created straylight as well as the entrance field. The second specificity that had to be analyzed is that the diffraction from the solar disk by the external occulter enters the instrument un-obstructed until the internal occulter, and with a brightness 100 times higher than the close corona (∼1RSun) brightness. The simulation of this diffraction as well as its propagation inside the ASPIICS telescope creating additional straylight, had to be carefully established in order to give realistic results of its impact on the performances while being actually possible to compute. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2022
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