RT Journal Article
T1 Cryostat and CCD for MEGARA at GTC
A1 Castillo Domínguez, E.
A1 Ferrusca Rodríguez, D.
A1 Tulloch, S.
A1 Velázquez, M.
A1 Carrasco, E.
A1 Gallego Maestro, Jesús
A1 Gil De Paz, Armando
A1 Sánchez, F. M.
A1 Vílchez, J. M.
AB 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.
PB SPIE-Int Soc Optical Engineering
SN 0277-786X
YR 2012
FD 2012
LK https://hdl.handle.net/20.500.14352/44865
UL https://hdl.handle.net/20.500.14352/44865
LA eng
NO © 2012 SPIE. Conference on Ground-Based and Airborne Telescopes IV (2012.Amsterdam, Netherlands)
DS Docta Complutense
RD 16 abr 2025