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Title

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

AuthorsPérez-Calpena, Ana; Sánchez-Blanco Mancera, Ernesto; Gomez-Alvarez, Pedro; Martínez Delgado, Ismael; Castillo, África; Gil de Paz, Armando; Arrillaga, Xabier; García Vargas, Marísa Luisa; Gallego, Jesús; Carrasco Licea, Esperanza; Iglesias-Páramo, J. ; Cedazo, Raque
KeywordsMEGARA
GTC
Multi-Object Spectrograph (MOS)
Optical fibers
Fiber bundles
Robotic positioners
Tilt
Pointing
Characterization
Verification
Issue Date2018
PublisherInternational Society for Optical Engineering
CitationProceedings of SPIE 10706: 107062C (2018)
AbstractMEGARA 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-¿m 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. © 2018 SPIE.
Publisher version (URL)http://dx.doi.org/10.1117/12.2311925
URIhttp://hdl.handle.net/10261/215830
DOIhttp://dx.doi.org/10.1117/12.2311925
Identifiersdoi: 10.1117/12.2311925
issn: 0277-786X
isbn: 978-1-5106-1966-1
Appears in Collections:(IAA) Artículos
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