GRANCAIN: the first light infrared camera for the adaptive optics of GTC: optical and mechanical design status

Eduardo D. González-Carretero; Verónica Canto-Caño; Antonio F. Moreno-Martín; José M. Delgado-Hernández; Marcos Reyes García-Talavera; José A. Acosta-Pulido; Patricia Fernández-Izquierdo; Enrique Jóven-Álvarez; Roberto López-López; Heidy Moreno-Arce; Jesús Patrón-Recio; Victor J. S. Béjar; Fabio Tenegi-Sangines; Chris Foster; Tim Keller; Jake Roberts

doi:10.1117/12.2627957

29 August 2022 GRANCAIN: the first light infrared camera for the adaptive optics of GTC: optical and mechanical design status

Eduardo D. González-Carretero, Verónica Canto-Caño, Antonio F. Moreno-Martín, José M. Delgado-Hernández, Marcos Reyes García-Talavera, José A. Acosta-Pulido, Patricia Fernández-Izquierdo, Enrique Jóven-Álvarez, Roberto López-López, Heidy Moreno-Arce, Jesús Patrón-Recio, Victor J. S. Béjar, Fabio Tenegi-Sangines, Chris Foster, Tim Keller, Jake Roberts

Author Affiliations +

Proceedings Volume 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V; 121881Q (2022) https://doi.org/10.1117/12.2627957
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

The Gran Telescopio de Canarias Adaptive Optic System (GTCAO) is designed to provide nearly diffraction-limited images to GTC. GRANCAIN (GRAN CAmara INfrarroja) is a first light imaging instrument in J, H, and K infrared bands, and it will be integrated into the Nasmyth focus of GTCAO, contributing to carry out his acceptance tests. The instrument aims to capture NIR (Near-Infrared) diffraction limit images for a field of view of 22x22 arcsec operating up to seeing conditions of 1.5 arcsec and zenithal distances up to 60deg. The instrument has a telecentric optical design based on a collimator-camera with a 2:1 magnification, with a cold stop and the filters located in the collimated beam. The detector is a 4Mpx Hawaii-2 PACE Teledyne (H2P), which operates at 77K. The instrument is composed of a rectangular aluminum 6061-T6 cryostat cooled by a closed Gifford-McMahon helium cycle cryocooler with an optical bench where the entire optical train is mounted. The opto-mechanical system consists of two filter wheels, containing three wide and three narrowband filters in the J, H, and K bands in charge of selecting the wavelengths of the science images. Thanks to a wide background knowledge built up at the Instituto de Astrofísica de Canarias (IAC) and the use of commercial elements, the instrument development plan has been reduced to one year and a half. The article contains a general description of the design, fabrication, integration, and testing of the opto-mechanical elements, cryostat, cooling, and anti-vibration systems.

Conference Presentation

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Eduardo D. González-Carretero, Verónica Canto-Caño, Antonio F. Moreno-Martín, José M. Delgado-Hernández, Marcos Reyes García-Talavera, José A. Acosta-Pulido, Patricia Fernández-Izquierdo, Enrique Jóven-Álvarez, Roberto López-López, Heidy Moreno-Arce, Jesús Patrón-Recio, Victor J. S. Béjar, Fabio Tenegi-Sangines, Chris Foster, Tim Keller, and Jake Roberts "GRANCAIN: the first light infrared camera for the adaptive optics of GTC: optical and mechanical design status", Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V, 121881Q (29 August 2022); https://doi.org/10.1117/12.2627957

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