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

Y. Wu, C.H. Vermeer, H.J. Holland, J. Doornink, B. Benthem, E. Boom, H.J.M. ter Brake

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

2 Citations (Scopus)
2 Downloads (Pure)


METIS is the 'Mid-infrared ELT Imager and Spectrograph' for the European Extremely Large Telescope (E-ELT) that will cover the thermal/mid-infrared wavelength range from 3 - 14 micron, and requires cryogenic cooling of detectors and optics. A vibration-free cooling technology for this instrument based on sorption coolers is 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 40 K and optics at 70 K. The latter temperature level is established by a pumped-liquid nitrogen line. The cooling powers required at the lower three levels are 0.4 W, 1.1 W, and 1.4 W, respectively. We propose a vibration-free sorption-based cooler with three cascaded Joule-Thomson (JT) coolers of which the sorption compressors are all heat sunk at the 70 K platform. A helium-operated cooler is used to obtain the 8 K level with a cooling power of 0.4 W. Here, three pre-cooling stages are used at 40 K, 25 K and 15 K. The latter two levels are provided by a hydrogen-based cooler, whereas the 40 K level is realized by a neon-based sorption cooler. In the paper, we present the preliminary design of this threestage cooler and we discuss the developments towards a demonstrator version of this METIS cooler.
Original languageEnglish
Title of host publicationAdvances in Cryogenic Engineering
Subtitle of host publication Transactions of the International Cryogenic Materials Conference, CEC : Anchorage, Alaska, USA ; 17-21 June 2013
EditorsJ.G. Weisend II
Place of PublicationAnchorage, Alaska
PublisherAmerican Institute of Physics
ISBN (Print)978-0-7354-1201-9
Publication statusPublished - 17 Jun 2014
Event2013 Cryogenic Engineering Conference and International Cryogenic Materials Conference, CEC/ICMC 2013 - Denaína Civic and convention Center, Anchorage, United States
Duration: 17 Jun 201321 Jun 2013

Publication series

NameAIP Conference Proceedings
PublisherAmerican Institute of Physics
ISSN (Print)0094-243X


Conference2013 Cryogenic Engineering Conference and International Cryogenic Materials Conference, CEC/ICMC 2013
Abbreviated titleCEC/ICMC
Country/TerritoryUnited States
Internet address


  • METIS-308278
  • IR-93766


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