Simulations of stray light from the surface scattering of the Solar Corona Imager primary mirror

Jianchao Xue; Marco Romoli; Federico Landini; Cristian Baccani; Hui Li; Yunqi Wang; Bo Chen

doi:10.1117/12.2576121

13 December 2020 Simulations of stray light from the surface scattering of the Solar Corona Imager primary mirror

Jianchao Xue, Marco Romoli, Federico Landini, Cristian Baccani, Hui Li, Yunqi Wang, Bo Chen

Proceedings Volume 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave; 114437E (2020) https://doi.org/10.1117/12.2576121
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

The Solar Corona Imager is an internally occulted coronagraph on board the ASO-S mission, which has the advantage of imaging the inner corona in H I Lyman-α (Lyα) and white-light (WL) wavebands. However, scattering of solar disk light by the primary mirror (M1) becomes the main source of stray light. To study the methods of stray light suppression, three scattering models are used to model M1 scattering in Zemax OpticStudio. The ratio of coronal emission to predicted stray light decrease along field of view in both channels. The stray light in Lyαchannel is generally lower than coronal emission, but the stray light in WL channel tends to be one order of magnitude higher than coronal signal at 2:5Rꙩ. Optimized parameter combinations that suppress the stray light to required level are obtained, which put some limitations on the M1 manufacture. Besides, K-correlation model is recommended to simulate surface scattering.

Conference Presentation

Citation Download Citation

Jianchao Xue, Marco Romoli, Federico Landini, Cristian Baccani, Hui Li, Yunqi Wang, and Bo Chen "Simulations of stray light from the surface scattering of the Solar Corona Imager primary mirror", Proc. SPIE 11443, Space Telescopes and Instrumentation 2020: Optical, Infrared, and Millimeter Wave, 114437E (13 December 2020); https://doi.org/10.1117/12.2576121

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