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MEGARA MOS: Where are my positioners and fibers pointing to?
Author(s): Ana Pérez-Calpena; Ernesto Sánchez-Blanco Mancera; Pedro Gomez-Alvarez; Ismael Martínez Delgado; África Castillo; Armando Gil de Paz; Xabier Arrillaga; Marísa Luisa García Vargas; Jesús Gallego; Esperanza Carrasco Licea; Jorge Iglesias-Páramo; Raquel Cedazo
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Paper Abstract

MEGARA is an integral-field and multi-object medium-resolution spectrograph for the GTC 10.4m telescope, which was commissioned on June - August 2017. MEGARA offers two observing modes, the LCB mode, a large central IFU; and a Multi-Object Spectrograph (MOS) mode, composed by 92 robotic positioners carrying 7-fiber minibundles each. This paper presents the models and measurements developed for the alignment between the image of the telescope pupil and the 100-μm fiber cores during the integration and verification at the laboratory. On the one hand, the error in the positioner-minibundles assembly was optimized with the aim of achieving a fiber-to-fiber flux homogeneity better than 10%. On the other hand, the positioner pointing was characterized in order to achieve a pointing precision of 1/5 of the spaxel size (which has been designed to be 0.62 arcsec). The on-sky measurements obtained during the commissioning to verify our laboratory results are also presented.

Paper Details

Date Published: 10 July 2018
PDF: 20 pages
Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107062C (10 July 2018); doi: 10.1117/12.2311925
Show Author Affiliations
Ana Pérez-Calpena, FRACTAL S.L.N.E (Spain)
Ernesto Sánchez-Blanco Mancera, FRACTAL S.L.N.E (Spain)
Pedro Gomez-Alvarez, FRACTAL S.L.N.E (Spain)
Ismael Martínez Delgado, FRACTAL S.L.N.E (Spain)
África Castillo, Univ. Complutense de Madrid (Spain)
Armando Gil de Paz, Univ. Complutense de Madrid (Spain)
Xabier Arrillaga, AVS Added Value Solutions (Spain)
Marísa Luisa García Vargas, FRACTAL S.L.N.E. (Spain)
Jesús Gallego, Univ. Complutense de Madrid (Spain)
Esperanza Carrasco Licea, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
Jorge Iglesias-Páramo, Instituto de Astrofísica de Andalucía - CSIC (Spain)
Raquel Cedazo, Univ. Politécnica de Madrid (Spain)

Published in SPIE Proceedings Vol. 10706:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
Ramón Navarro; Roland Geyl, Editor(s)

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