Turkey s next big science project DAG the 4 meter telescope

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2014-07-22

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KESKİN, ONUR
YEŞİLYAPRAK, CAHİT
Yerli, Sinan Kaan
ZAGO, LORENZO
JOLISSAINT, LAURENT

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The DAG (Turkish for Eastern Anatolia Observatory) 4-m telescope project has been formally launched in 2012, being fully funded by the Government of Turkey. This new observatory is to be located on a 3170 m altitude ridge near the town of Erzurum in Eastern Anatolia. First light is scheduled for late 2017. The DAG team's baseline design of the telescope consists of a Ritchey-Chretien type with alt-az mount, a focal length of 56 m and a field of view up to 30 arcmin. Multiple instruments will be located at the Nasmyth foci. The optical specifications of the telescope are set by DAG team for diffraction limited performance with active and adaptive optics. Modern mirror control technologies will allow defining in a most cost effective way the figuring requirements of the optical surfaces: the low order figuring errors of the combined optical train constituted of M1-M2-M3 are defined in terms of Zernike coefficients and referred to the M1 surface area. The high order figuring errors are defined using the phase structure functions. Daytime chilling of the closed enclosure volume and natural ventilation through suitable openings during observations will be used to ensure optimal mirror and dome seeing. A design of a ground layer adaptive optics (GLAO) subsystem is developed concurrently with the telescope. In this paper, main design aspects, the optical design and expected performance analysis of the telescope will be presented.

Subject Keywords

Telescope, Turkey, Active optics, Adaptive optics, GLAO

URI

https://hdl.handle.net/11511/45929

DOI

https://doi.org/10.1117/12.2067599

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Department of Physics, Conference / Seminar

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The design of an adaptive optics telescope : the case of DAG Jolissaint, Laurent; KESKİN, ONUR; Zago, Lorenzo; Yerli, Sinan Kaan; YEŞİLYAPRAK, Cahit; Mudry, Emeric; Lousberg, Gregory (2016-07-01) In this paper, we describe in detail the optical design of DAG, a new 4 m telescope for Turkey. DAG is an ”adaptive optics friendly” telescope, in a sense that each design decision is taken considering the potential impact on the AO performance (vibrations, static aberrations etc.) The objective is to make this telescope fully ready for AO at first light. It is designed as a Ritchey-Chr´etien combination, 56 m focal length, with Nasmyth foci only, and active optics. Its total RMS error is expected to be 45 ...

Citation Formats

O. KESKİN, C. YEŞİLYAPRAK, S. K. Yerli, L. ZAGO, and L. JOLISSAINT, “Turkey s next big science project DAG the 4 meter telescope,” 2014, vol. 9145, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/45929.