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Turkey s next big science project DAG the 4 meter telescope
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Date
2014-07-22
Author
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
Collections
Department of Physics, Conference / Seminar
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DAG (Eastern Anatolia Observatory in Turkish) will be the newest and largest (4m) observatory of Turkey in both optical (VIS) and near-infrared (NIR) Owith its robust observing site infrastructure. The telescope is designedOto house 2 Nasmyth platformes which will be dedicated to NIR and VIS observations. A collaboration has recently been established among four Turkish universities including FMV Isik University (for adaptive optics systems), Middle East Technical University (fort measurement, test and calib...
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This document (Eastern Anatolia Observatory (DAG) is the new observatory of Turkey with the optical and near-infrared largest telescope (4 m class) and its robust observing site infrastructure. This national project consists of three phases with DAG (Telescope, Enclosure, Buildings and Infrastructures), FPI (Focal Plane Instruments and Adaptive Optics) and MCP (Mirror Coating Plant) and is supported by the Ministry of Development of Turkey. The tenders of telescope and enclosure have been made and almost al...
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The four meter DAG (Eastern Anatolia Observatory in Turkish) telescope is not only the largest telescope in Turkey but also the most promising telescope in the northern hemisphere with a large potential to offer scientific observations with its cutting edge technology. DAG is designed to be an AO telescope which will allow both infrared and visible observations with its two Nasmyth platforms dedicated to next generation focal plane instruments. In this paper, status updates from DAG telescope will be presen...
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YEŞİLYAPRAK, Cahit; Yerli, Sinan Kaan; KESKİN, ONUR; Gucsav, B. Bulent (2016-07-01)
DAG (Eastern Anatolia Observatory is read as "Dogu Anadolu Gozlemevi" in Turkish) is the newest and largest observatory of Turkey, constructed at an altitude of 3170 m in Konakli/Erzurum province, with an optical and near-infrared telescope (4 m in diameter) and its robust observing site infrastructure. This national project consists of three main phases: DAG (Telescope, Enclosure, Buildings and Infrastructures), FPI (Focal Plane Instruments and Adaptive Optics) and MCP (Mirror Coating Plant). All these thr...
The design of an adaptive optics telescope : the case of DAG
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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 ...
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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.