Baseline design of a sorption-based Joule-Thomson cooler chain for the METIS instrument in the E-ELT

Y. Wu*, D. R. Zalewski, C. H. Vermeer, H. J. Holland, B. Benthem, H. J.M. ter Brake

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

9 Citations (Scopus)
1 Downloads (Pure)

Abstract

METIS, the Mid-Infrared E-ELT Imager and Spectrograph, is one of the proposed instruments in E-ELT (European Extremely Large Telescope). Its infrared detectors require multiple operating temperatures below 77 K. Therefore, active coolers have to be deployed to provide sub-liquid-nitrogen (sub-LN2) temperature cooling. However, the sensitive imaging optical detecting system also demands very low levels of vibration. Thus, the University of Twente proposed a vibration-free cooling technique based on physical sorption. In this paper, we describe the baseline design of such a sorption-based Joule-Thomson cooler chain for the METIS instrument, that is able to deliver cooling powers of 0.4 W at 8 K, 1.1 W at 25 K and 1.4 W at 40 K from a 70-K heat sinking. This design is based on working fluid selection, cascading cooler stages and operating parameter optimization. Also, the performance of the resulting cooler design is analyzed.

Original languageEnglish
Pages (from-to)37-52
Number of pages16
JournalCryogenics
Volume84
DOIs
Publication statusPublished - 1 Jun 2017

Keywords

  • E-ELT
  • Heat switch
  • Joule-Thomson cooler
  • METIS
  • Sorption compressor
  • Vibration free

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