Abstract
A Golay3 multi-mirror telescope (MMT) system is designed in this paper. The fill factor of the Golay3 MMT is derived from the angular resolution of the telescope. An initial configuration is established according to the paraxial optical theory. A three-element aspheric corrector group is designed and placed in the converging light cone to enlarge the field of view (FOV) of the Golay3 MMT. The tolerance analysis for each surface of the Golay3 MMT is conducted using the Monte Carlo method. The design results show the FOV of the Golay3 MMT system can be increased to 1.5° with the insertion of a three-element aspheric corrector group. The results of the tolerance analysis indicate that most tolerances are loose, while some decenter tolerances relating with the aspheric surfaces are relatively tight, but still within an acceptable range.
Highlights
The quest for finer angular resolution in astronomy will inevitably lead to larger apertures, which has pushed the limits of size and weight for monolithic primary mirrors
One type of sparse aperture systems is the multiple-mirror telescope (MMT) [5], such as the proposed Giant Magellan Telescope (GMT), in which the primary mirror consists of seven 8.4 m segments and the secondary mirror is segmented to match the primary mirror with seven 1.1 m segments [6]
A Golay3 MMT based on the Cassegrain configuration was designed
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Large primary mirrors are increasingly difficult to fabricate and mount; they may even be impossible to launch for space-based systems. Technologies such as segmented and sparse aperture system are developed as the generation of telescopes [1,2,3,4]. The MMT system usually has a relatively small field of view (FOV) due to the co-phasing requirement of the sub-mirrors. In 2008, Wang et al presented a MMT prototype [10] in which the spherical primary mirror consisted of eight annular sub-mirrors and one central mirror. Sci. 2021, 11, 1200 the spherical primary mirror consisted of eight annular sub-mirrors and one central mirror.insertion.
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