MEGARA MOS: Where are my positioners and fibers pointing to?

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

doi:10.1117/12.2311925

10 July 2018 MEGARA MOS: Where are my positioners and fibers pointing to?

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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Proceedings Volume 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III; 107062C (2018) https://doi.org/10.1117/12.2311925
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

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.

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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, and Raquel Cedazo "MEGARA MOS: Where are my positioners and fibers pointing to?", Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107062C (10 July 2018); https://doi.org/10.1117/12.2311925

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