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Cryostat and CCD for MEGARA at GTC

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Castillo Domínguez, E. and Ferrusca Rodríguez, D. and Tulloch, S. and Velázquez, M. and Carrasco, E. and Gallego Maestro, Jesús and Gil de Paz, Armando and Sánchez, F. M. and Vílchez, J. M. (2012) Cryostat and CCD for MEGARA at GTC. Proceedings of SPIE, 8446 . ISSN 0277-786X

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Official URL: http://dx.doi.org/10.1117/12.925398




Abstract

MEGARA (Multi-Espectrografo en GTC de Alta Resolucion para Astronomia) 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.


Item Type:Article
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© 2012 SPIE. Conference on Ground-Based and Airborne Telescopes IV (2012.Amsterdam, Netherlands)

Uncontrolled Keywords:MEGARA; Cryostat; CCD231
Subjects:Sciences > Physics > Astrophysics
Sciences > Physics > Astronomy
ID Code:35255
Deposited On:26 Jan 2016 16:33
Last Modified:10 Dec 2018 15:05

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