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Proceedings Paper

Installation, alignment method, and preliminary test results of the Thai National Telescope focal reducer
Author(s): Apirat Prasit; Christophe Buisset; Thierry Lépine; Matthew Ridsdill-Smith; Anurak Chakpor; Apichat Leckngam; Griangsak Thummasorn ; Surin Ngernsujja; Anuphong Inpan; Pimon Kaewsamoet; Cyril Cavadore; Saran Poshyachinda; Boonrucksar Soonthornthum
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Paper Abstract

The National Astronomical Research Institute of Thailand (NARIT) is currently developing a new kind of focal reducer for the 2.4 m Thai National Telescope (TNT). The objective is to image a circular Field Of View (FOV) of 15 arcminute diameter with an image quality close to the seeing limit over the spectral bands B, V, R and I. This focal reducer comprises one doublet lens L1 located on one robotic rail mounted on the telescope fork and one triplet lens L2 mounted on the instrument cube in front of the camera. First, we remind the specifications and the optical design of the instrument. Second, we present the method used to assemble the lenses inside the barrels. Third, we describe the procedure we have used to integrate the focal reducer on the TNT. We describe the robotic rail on which L1 is mounted and we present the results of the wavefront measurement performed to verify the optical quality of the TNT equipped with L1. We also describe the operations of the installation of L2, the filter wheel and the camera on the telescope. Fourth, we present the preliminary performance of the focal reducer measured on-sky with the TNT. We show that the focal reducer provides a resolution close to 1.5’’ over a FOV equal to 12’x12’ limited by the dimensions of the current filters. We also show that the plate scale is equal to 0.6’’/pixel and is stable over the B, V, R and I bands.

Paper Details

Date Published: 9 September 2019
PDF: 13 pages
Proc. SPIE 11116, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II, 111161A (9 September 2019);
Show Author Affiliations
Apirat Prasit, National Astronomical Research Institute of Thailand (Thailand)
Christophe Buisset, National Astronomical Research Institute of Thailand (Thailand)
Thierry Lépine, Institut d'Optique Graduate School (France)
Lab. Hubert Curien, Univ. de Lyon, CNRS (France)
Matthew Ridsdill-Smith, The Univ. of Sheffield (United Kingdom)
Anurak Chakpor, National Astronomical Research Institute of Thailand (Thailand)
Apichat Leckngam, National Astronomical Research Institute of Thailand (Thailand)
Griangsak Thummasorn , National Astronomical Research Institute of Thailand (Thailand)
Surin Ngernsujja, National Astronomical Research Institute of Thailand (Thailand)
Anuphong Inpan, National Astronomical Research Institute of Thailand (Thailand)
Pimon Kaewsamoet, National Astronomical Research Institute of Thailand (Thailand)
Cyril Cavadore, ALCOR SYSTEM (France)
Saran Poshyachinda, National Astronomical Research Institute of Thailand (Thailand)
Boonrucksar Soonthornthum, National Astronomical Research Institute of Thailand (Thailand)


Published in SPIE Proceedings Vol. 11116:
Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems II
Tony B. Hull; Dae Wook Kim; Pascal Hallibert, Editor(s)

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