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Proceedings Paper

Configuration for Chinese Future Giant Telescope
Author(s): Ding-qiang Su; Ya-nan Wang; Xiangqun Cui
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Paper Abstract

This telescope has 30m aperture, segmented primary mirror and alt-azimuth mounting. The aspherical primary mirror with f-ratio 1.2 consists of 1122 partial annular submirrors. The optical system includes Nasmyth I and II systems, Cassegrain system, coude system and a wide field of view system. There are four Nasmyth platforms. Two Nasmyth I foci are located on the upper floor and two Nasmyth II foci are located in the lower floor. All Nasmyth I, II and Cassegrain systems use same one secondary mirror, and all are R-C systems. With adaptive optics system, several diffraction-limited observations can be operated simultaneously on Nasmyth II platforms. The wide field of view system has 20 arcmin FOV, can correct atmospheric dispersion and the low space frequency error from primary mirror and atmosphere turbulence. A special rocking chair structure is designed which can realize the horizontal axis on the front of primary mirror. The tolerances of the surface shape and position of submirrors are given. The issues about tip-tilt correction and adaptive optics are discussed. Some formulae on rotating conic surface especially used for segmented mirror are given.

Paper Details

Date Published: 28 September 2004
PDF: 12 pages
Proc. SPIE 5489, Ground-based Telescopes, (28 September 2004); doi: 10.1117/12.552451
Show Author Affiliations
Ding-qiang Su, Nanjing Institute of Astronomical Optics and Technology (China)
Nanjing Univ. (China)
Ya-nan Wang, Nanjing Institute of Astronomical Optics and Technology (China)
Xiangqun Cui, Nanjing Institute of Astronomical Optics and Technology (China)

Published in SPIE Proceedings Vol. 5489:
Ground-based Telescopes
Jacobus M. Oschmann, Editor(s)

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