Development of a sorption-cooled continuous miniature dilution refrigerator for 100 mK detector testing

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

May, A.J.^1 ; Azzoni, S.^1 ; Banys, D.^1 ; Coppi, G.^1^2 ; Haynes, V.^1 ; McCulloch, M.A.^1 ; Melhuish, S.J.^1 ; Piccirillo, L.^1 ; Wenninger, J.^1

Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester

M13 9PL, United Kingdom^1

Department of Physics and Astronomy, University of Pennsylvania, 209 South 33rd Street, Philadelphia

PA

19104, United States^2

关键词: Cosmic microwave backgrounds;    Detector arrays;    Detector testing;    Dilution refrigerator;    Gas handling systems;    Related systems;    Sorption coolers;    Temperature regimes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012135/pdf
DOI  :  10.1088/1757-899X/502/1/012135

来源: IOP

【 摘 要 】

As the forthcoming generation of Cosmic Microwave Background observatories move towards the use of large format detector arrays operating at ∼100 mK, the need for test cryostats capable of operating in this temperature regime is becoming more pronounced. This has strongly driven the development of several related systems, including the continuous miniature dilution refrigerator (MDR) reported here. The MDR is comprised of a thermally separated mixing chamber, step heat exchangers, twin stills and twin condensation pumps. The pumps are alternately cooled to ∼300 mK by a pair of single-shot 1He sorption coolers (cycled in anti-phase) to circulate 3He in the system. The system is therefore closed-cycle, with the circulation of 3He, both in the MDR and sorption coolers, contained to the cold stage. As a result, the reliability of the system is improved through a mechanically simple design and the absence of external connections, gas handling systems, and cold o-rings.