Chinese Future Giant Telescope

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The Chinese Future Giant Telescope is a proposed optical telescope with a primary mirror that has a 30-meter diameter.[1]

## Contents

* 1 Major characteristics
* 2 See also
* 3 References
* 4 Further reading

## Major characteristics

The Chinese Future Giant Telescope has a primary focal ratio of 1.2. Its primary mirror is segmented with 1020 annular submirrors arranged in 17 concentric annuli. Each segment has average length and width both of 0.8 m. Apart from a conventional Cassegrain focus, four Nasmyth foci on two double-deck platforms on both sides are also present. There is a Coudé focus provided for there interferometric array. The comparatively small secondary mirror is 2.74 m in diameter, which will serve active corrections.[1] Other characteristics include:

1. Partial annular submirrors
2. One of coude planar mirrors is aspherical; better image quality is obtained from such a system.
3. A pair of lens-prisms are used in a wide field of view system. Better image quality is obtained and atmospheric dispersion is corrected.[2]

## See also

* Lists of telescopes

## References

1. ↑ 1.0 1.1 Li, Guoping (September 2004). "Preliminary structure design and analysis of the Chinese Future Giant Telescope". Astronomical Structures and Mechanisms Technology. Proceedings of the SPIE. 5495. pp. 204. doi:10.1117/12.551172. Bibcode: 2004SPIE.5495..204L. http://spie.org/x648.html?product_id=551172.
2. ↑ Cui, Xiangqun; Su, Ding-Qiang; Wang, Ya-Nan (2003). "Configuration for Chinese Future Giant Telescope". IAU Joint Discussion (The Smithsonian/NASA Astrophysics Data System) 25. Bibcode: 2003IAUJD...8E..53C.

## Further reading

* Hu, S. W. et al. (2022). "Concept design for the main structure of 30 m Chinese Future Giant Telescope". Opto-Electronic Engineering 49 (6): 210402. doi:10.12086/oee.2022.210402.
* Ni, Jijun et al. (July 2018). "The research progress of eddy current edge sensors for Chinese extremely large telescope". Ground-based and Airborne Telescopes VII. Proceedings of the SPIE. 10700. p. 1070063. doi:10.1117/12.2312584. ISBN 978-1-5106-1953-1. Bibcode: 2018SPIE10700E..63N.
* Zhang, En-Peng et al. (June 2016). "Preliminary numerical simulation of mirror seeing for the Chinese Future Giant Telescope". Research in Astronomy and Astrophysics 16 (6): 98. doi:10.1088/1674-4527/16/6/098. Bibcode: 2016RAA....16...98Z.
* Xin-nan, Li et al. (October–December 2012). "Study on the Stressed Mirror Polishing with a Continuous Polishing Machine for Large Aperture Off-axis Aspheric Mirrors". Chinese Astronomy and Astrophysics 36 (4): 435–444. doi:10.1016/j.chinastron.2012.10.009. Bibcode: 2012ChA&A..36..435L.
* Jiang, Liyuan; Li, Xinnan (October 2010). "Considerations on testing of CFGT primary segments". 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment. Proceedings of the SPIE. 7656. p. 76566H. doi:10.1117/12.866226. Bibcode: 2010SPIE.7656E..6HJ.
* Liu, Zhong; Cui, Xiangqun (April 2008). "The ELT situation in China". in Andersen, Torben E.. Extremely Large Telescopes: Which Wavelengths? Retirement Symposium for Arne Ardeberg. Proceedings of the SPIE. 6986. p. 698606. doi:10.1117/12.801257. Bibcode: 2008SPIE.6986E..06L.
* Xu, Xinqi et al. (June 2006). "Mount control system for the CFGT telescope". in Stepp, Larry M.. Ground-based and Airborne Telescopes. Proceedings of the SPIE. 6267. p. 62672B. doi:10.1117/12.671059. Bibcode: 2006SPIE.6267E..2BX.

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