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  A sensitivity analysis of the updated optical design for EUVST on the solar-C mission

Kawate, T., Tsuzuki, T., Shimizu, T., Imada, S., Katsukawa, Y., Hara, H., et al. (2020). A sensitivity analysis of the updated optical design for EUVST on the solar-C mission. In Proceedings Volume 11444, Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray.

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 Creators:
Kawate, T., Author
Tsuzuki, T., Author
Shimizu, T., Author
Imada, S., Author
Katsukawa, Y., Author
Hara, H., Author
Suematsu, Y., Author
Ichimoto, K., Author
Hattori, T., Author
Narasaki, S., Author
Warren, H.P., Author
Teriaca, Luca1, Author           
Korendyke, C.M., Author
Brown, C.M., Author
Auchére, F., Author
Affiliations:
1Department Sun and Heliosphere, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832289              

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 Abstract: The EUV high-throughput spectroscopic telescope (EUVST) onboard the Solar-C mission has the high spatial (0.4′′) resolution over a wide wavelength range in the vacuum ultraviolet. To achieve high spatial resolution under a design constraint given by the JAXA Epsilon launch vehicle, we further update the optical design to secure margins needed to realize 0.4′′ spatial resolution over a field of view of 100′′×100′′. To estimate the error budgets of spatial and spectral resolutions due to installation and fabrication errors, we perform a sensitivity analysis for the position and orientation of each optical element and for the grating parameters by ray tracing with the Zemax software. We obtain point spread functions (PSF) for rays from 9 fields and at 9 wavelengths on each detector by changing each parameter slightly. A full width at half maximum (FWHM) of the PSF is derived at each field and wavelength position as a function of the perturbation of each optical parameter. Assuming a mount system of each optical element and an error of each optical parameter, we estimate spatial and spectral resolutions by taking installation and fabrication errors into account. The results of the sensitivity analysis suggest that budgets of the total of optical design and the assembly errors account for 15% and 5.8% of our budgets of the spatial resolution in the long wavelength and short wavelength bands, respectively. On the other hand, the grating fabrication errors give a large degradation of spatial and spectral resolutions, and investigations of compensators are needed to relax the fabrication tolerance of the grating surface parameters.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1117/12.2560573
 Degree: -

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Title: Proceedings Volume 11444, Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 114443J Start / End Page: - Identifier: -