High-resolution aperture shape analysis for the JUICE and Europa ultraviolet spectrographs

Michael W. Davis; Steven N. Osterman; G. Randall Gladstone; Kurt D. Retherford

doi:10.1117/12.2529668

9 September 2019 High-resolution aperture shape analysis for the JUICE and Europa ultraviolet spectrographs

Michael W. Davis, Steven N. Osterman, G. Randall Gladstone, Kurt D. Retherford

Proceedings Volume 11118, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXI; 1111819 (2019) https://doi.org/10.1117/12.2529668
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

Abstract

The JUICE (Jupiter ICy moons Explorer) and Europa Ultraviolet Spectrographs (JUICE-UVS and Europa-UVS, respectively) are nearly identical modest-powered (~9W) instruments scheduled to explore the Jovian satellites aboard ESA’s JUICE and NASA’s Europa Clipper missions, respectively. These spectrographs each feature a dedicated door containing a high-resolution aperture stop that reduces the focal ratio of the telescope from f/3 to f/12. The baseline design for this aperture was a 1-cm diameter circle. We compared the optical properties of the baseline 1-cm diameter aperture with a 1-cm by 1-cm square aperture in an effort to increase throughput by 27% while maintaining the native spatial resolution of the spectrograph. The effects of both apertures were analyzed with no appreciable difference in the resulting spatial or spectral resolution. Therefore, the 1-cm by 1-cm square aperture has been implemented in both JUICE- and Europa-UVS.

Conference Presentation

Citation Download Citation

Michael W. Davis, Steven N. Osterman, G. Randall Gladstone, and Kurt D. Retherford "High-resolution aperture shape analysis for the JUICE and Europa ultraviolet spectrographs", Proc. SPIE 11118, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXI, 1111819 (9 September 2019); https://doi.org/10.1117/12.2529668

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