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Proceedings Paper

Cryostat and CCD for MEGARA at GTC
Author(s): E. Castillo-Domínguez; D. Ferrusca Rodríguez; S. Tulloch; M. Velázquez; E. Carrasco; J. Gallego; A. Gil de Paz; F. M. Sánchez; J. M. Vílchez Medina
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Paper Abstract

MEGARA (Multi-Espectrógrafo en GTC de Alta Resolución para Astronomía) is the new integral field unit (IFU) and multi-object spectrograph (MOS) instrument for the GTC. The spectrograph subsystems include the pseudo-slit, the shutter, the collimator with a focusing mechanism, pupil elements on a volume phase holographic grating (VPH) wheel and the camera joined to the cryostat through the last lens, with a CCD detector inside. In this paper we describe the full preliminary design of the cryostat which will harbor the CCD detector for the spectrograph. The selected cryogenic device is an LN2 open-cycle cryostat which has been designed by the "Astronomical Instrumentation Lab for Millimeter Wavelengths" at INAOE. A complete description of the cryostat main body and CCD head is presented as well as all the vacuum and temperature sub-systems to operate it. The CCD is surrounded by a radiation shield to improve its performance and is placed in a custom made mechanical mounting which will allow physical adjustments for alignment with the spectrograph camera. The 4k x 4k pixel CCD231 is our selection for the cryogenically cooled detector of MEGARA. The characteristics of this CCD, the internal cryostat cabling and CCD controller hardware are discussed. Finally, static structural finite element modeling and thermal analysis results are shown to validate the cryostat model.

Paper Details

Date Published: 24 September 2012
PDF: 10 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 84465Y (24 September 2012); doi: 10.1117/12.925398
Show Author Affiliations
E. Castillo-Domínguez, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
D. Ferrusca Rodríguez, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
S. Tulloch, FRACTAL S.L.N.E (Spain)
M. Velázquez, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
E. Carrasco, Instituto Nacional de Astrofísica, Óptica y Electrónica (Mexico)
J. Gallego, Univ. Complutense de Madrid (Spain)
A. Gil de Paz, Univ. Complutense de Madrid (Spain)
F. M. Sánchez, Univ. Politécnica de Madrid (Spain)
J. M. Vílchez Medina, Instituto de Astrofísica de Andalucía (Spain)


Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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