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Balloon-borne FIREBall-2 ultraviolet spectrograph stray light control based on nonsequential reverse modeling of on-sky data
Journal article   Open access   Peer reviewed

Balloon-borne FIREBall-2 ultraviolet spectrograph stray light control based on nonsequential reverse modeling of on-sky data

Trenton Brendel, Aafaque Khan, Simran Agarwal, Heejoo Choi, Daewook Kim, Erika Hamden, Vincent Picouet, D. Christopher Martin, Bruno Milliard, David Schiminovich, …
Journal of astronomical telescopes, instruments, and systems, Vol.8(4), pp.048001-048001
10/01/2022
DOI: 10.1117/1.JATIS.8.4.048001
url
https://doi.org/10.1117/1.JATIS.8.4.048001View
Published (Version of record) Open Access

Abstract

We present a comprehensive stray light analysis and mitigation strategy for the FIREBall-2 ultraviolet balloon telescope. Using nonsequential optical modeling, we identified the most problematic stray light paths, which impacted telescope performance during the 2018 flight campaign. After confirming the correspondence between the simulation results and postflight calibration measurements of stray light contributions, a system of baffles was designed to minimize stray light contamination. The baffles were fabricated and coated to maximize stray light collection ability. Once completed, the baffles will be integrated into FIREBall-2 and tested for performance preceding the upcoming flight campaign. Given our analysis results, we anticipate a substantial reduction in the effects of stray light.
nonsequential ray tracing optomechanical design stray light analysis

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