Preliminary investigation on the effect of secondary mirror assembly on the optical performance for the MUltiplexed Survey Telescope

Shunhua Gao; Liquan Guo; Qi Bian; Dedong Gao; Haijiao Jiang; Lei Huang

doi:10.1117/12.2687403

28 November 2023 Preliminary investigation on the effect of secondary mirror assembly on the optical performance for the MUltiplexed Survey Telescope

Shunhua Gao, Liquan Guo, Qi Bian, Dedong Gao, Haijiao Jiang, Lei Huang

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Proceedings Volume 12765, Optical Design and Testing XIII; 127651L (2023) https://doi.org/10.1117/12.2687403
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

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Abstract

MUltiplexed Survey Telescope (MUST) proposed by Tsinghua University is a 6.5-meter widefield telescope for the ground-based spectroscopic survey. To realize the design target of large field of view of 7 square degrees, the effective aperture of the secondary mirror is preliminarily designed to be 2.4 meters, and the mass of the secondary mirror assembly is supposed to be about 3 tons. Under different zenith angles, the attitude variation of the secondary mirror assembly will affect the stability of the optical axis and result in the spot drift of the focus image on the focal plane. In this paper, a simulation model of the top end assembly is established. Finite element analysis is carried out to investigate the effects of different parameters of the top end assembly on the performance of the optical system, including the vane horizontal offset angle, the vane altitude offset angle, and different forms of ring assembly. Based on the simulation results, an optimized top end assembly is preliminarily obtained and the magnitude of spot drift on the focal plane could be effectively limited at different zenith angles and field of view (FOV).

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Shunhua Gao, Liquan Guo, Qi Bian, Dedong Gao, Haijiao Jiang, and Lei Huang "Preliminary investigation on the effect of secondary mirror assembly on the optical performance for the MUltiplexed Survey Telescope", Proc. SPIE 12765, Optical Design and Testing XIII, 127651L (28 November 2023); https://doi.org/10.1117/12.2687403

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