Sorption-based vibration-free coler for the METIS instrument on E-ELT


Share/Save/Bookmark

Brake, H.J.M. ter and Wu, Y. and Zalewski, D.R. and Vermeer, C.H. and Holland, H.J. and Doornink, J. and Benthem, B. and Boom, E. (2012) Sorption-based vibration-free coler for the METIS instrument on E-ELT. In: SPIE Astronomical Telescopes and Instrumentation, 01-07-2012 - 06-07-2012, Amsterdam (pp. 1 - 11).

[img] PDF
Restricted to UT campus only
: Request a copy
7MB
Abstract:METIS is the 'Mid-infrared ELT Imager and Spectrograph' for the European Extremely Large Telescope. This E-ELT instrument will cover the thermal/mid-infrared wavelength range from 3 to 14 μm and will require cryogenic cooling of detectors and optics. We present a vibration-free cooling technology for this instrument based on sorption coolers developed at the University of Twente in collaboration with Dutch Space. In the baseline design, the instrument has four temperature levels: N-band: detector at 8 K and optics at 25 K; L/M-band: detector at 40K and optics at 77 K. The latter temperature is established by a liquid nitrogen supply with adequate cooling power. The cooling powers required at the lower three levels are 0.4 W, 1.1 W, and 1.4 W, respectively. The cryogenic cooling technology that we propose uses a compressor based on the cyclic adsorption and desorption of a working gas on a sorber material such as activated carbon. Under desorption, a high pressure can be established. When expanding the high-pressure fluid over a flow restriction, cooling is obtained. The big advantage of this cooling technology is that, apart from passive valves, it contains no moving parts and, therefore, generates no vibrations. This, obviously, is highly attractive in sensitive, high-performance optical systems. A further advantage is the high temperature stability down to the mK level. In a Dutch national research program we aim to develop a cooler demonstrator for METIS. In the paper we will describe our cooler technology and discuss the developments towards the METIS cooler demonstrator
Item Type:Conference or Workshop Item
Copyright:© SPIE
Faculty:
Science and Technology (TNW)
Research Group:
Link to this item:http://purl.utwente.nl/publications/82269
Official URL:http://dx.doi.org/10.1117/12.927002
Export this item as:BibTeX
EndNote
HTML Citation
Reference Manager

 

Repository Staff Only: item control page

Metis ID: 289400