22 July 2010 First concept for the E-ELT cryogenic infrastructure
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Abstract
The start of the new generation of giant telescopes opens a good opportunity to re-assess the cryogenic cooling of the instruments and detectors. An analysis has been carried out comparing three different technologies: Mechanical cryocoolers, helium forced flow and open liquid nitrogen cooling. The most different aspects from the running cost to the reliability and technology readiness have been compared in order to establish a fair ranking. The first part of the paper will present in detail the result of this analysis. Based on this study and the various experiences collected over more than 25 years and a large number of cryogenic instruments, a strategy is elaborated for the cryogenic cooling of the E-ELT (European Extremely Large Telescope) instrument suite. The challenge consists in providing various cryogenic temperatures (from 10 K to 240 K) at various locations. This should be done in the most efficient way with the minimum of disturbances (low vibration, low thermal dissipation...). A discussion presents the advantages of the selected solution.
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J. L. Lizon, J. L. Lizon, J. C. Gonzalez, J. C. Gonzalez, C. Monroe, C. Monroe, I. Bryson, I. Bryson, D. Montgomery, D. Montgomery, } "First concept for the E-ELT cryogenic infrastructure", Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77393J (22 July 2010); doi: 10.1117/12.856329; https://doi.org/10.1117/12.856329
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