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



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Pérez Calpena, Ana and Sánchez-Blanco Mancera, Ernesto and Gómez Álvarez, Pedro and Martínez Delgado, Ismael and Castillo Morales, África and Gil de Paz, Armando and Arrillaga, Xabier, Xabier and García Vargas, Marisa Luisa and Gallego Maestro, Jesús and Carrasco Licea, Esperanza and Iglesias Páramo, Jorge;, Jorge and Cedazo, Raquel (2018) MEGARA MOS: where are my positioners and fibers pointing to? Proceedings of SPIE, 10706 . ISSN 0277-786X

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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-itm 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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© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only. Conference on Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation (III. 2018. Austin, TX)

Uncontrolled Keywords:MEGARA; GTC; Multi-object spectrograph (MOS); Optical fibers; Fiber bundles; Robotic positioners; Tilt; pointing; characterization; verification
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:50820
Deposited On:13 Feb 2019 09:41
Last Modified:13 Feb 2019 09:41

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