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Proceedings Paper

Thai National Telescope beam simulator testbed development status
Author(s): Christophe Buisset; Apirat Prasit; Thierry Lépine; Saran Poshyachinda; A. Leckngam
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Paper Abstract

The Thai National Telescope (TNT) is a Ritchey-Chretien Telescope with a clear aperture ΦM1 = 2.3 m, a focal ratio f/10 and a central obstruction Obsc = 0.3. The TNT is the main instrument of the Thai National Observatory (TNO) which is located near the summit of the Doi Inthanon, situated in the Chiang Mai Province of Thailand at altitude 2,457 meters. The median seeing on this site is approximately 0.9” and is remarkably stable on most nights, rarely exceeding 2”. We decided to develop an optical setup to simulate in laboratory conditions the geometry of the TNT output beam. This, in order to carefully prepare and to improve the efficiency of the test to be performed in real conditions at the TNT focal plane level. We specified the setup to be representative of the TNT optical design, beam aperture, central obscuration, geometry of the spider, wavefront quality and PSF size under various seeing conditions. This setup comprises 2 identical Cassegrain telescopes mounted on dedicated supports with 5 degree-of-Freedom. The first application of this setup will be the preparation of the TNT optical alignment. The second application of this setup will be the development and the test of the future instruments for the TNT such as a focal reducer or a spectrograph. In this paper, we discuss the setup specifications we describe the setup optical and mechanical design and we present the performance.

Paper Details

Date Published: 27 July 2016
PDF: 14 pages
Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99063N (27 July 2016); doi: 10.1117/12.2229573
Show Author Affiliations
Christophe Buisset, National Astronomical Research Institute of Thailand (Thailand)
Apirat Prasit, National Astronomical Research Institute of Thailand (Thailand)
Thierry Lépine, Institut d'Optique Graduate School (France)
Lab. Hubert Curien, CNRS, Univ. de Lyon (France)
Saran Poshyachinda, National Astronomical Research Institute of Thailand (Thailand)
A. Leckngam, National Astronomical Research Institute of Thailand (Thailand)

Published in SPIE Proceedings Vol. 9906:
Ground-based and Airborne Telescopes VI
Helen J. Hall; Roberto Gilmozzi; Heather K. Marshall, Editor(s)

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