A progress report is provided on the development of a tiltable continuous miniature dilution refrigerator and associated 3He/4He sorption coolers. These systems are currently being developed to provide sub-Kelvin cooling of the bolometer arrays for several ground- and balloon-based experiments which aim to measure the polarization of the Cosmic Microwave Background (QUBIC, LSPE and POLARBEAR-2). The novel tiltable miniaturised system benefits from a lack of external circulation pumps and a mechanically simple design. The condenser of the twin-pumped recirculating diluter is cooled continuously by two 3He/4He sorption coolers. The sorption pumps are operated by convective heat switches. The dilution unit features a thermally separated mixing chamber, still and step heat exchangers. The designs and analyses of both the sorption coolers and the diluter are reported; both systems have been manufactured and are presently under test.

May, A., Calisse, P., Coppi, G., Haynes, V., Martinis, L., Mcculloch, M., et al. (2016). Sorption-cooled continuous miniature dilution refrigeration for astrophysical applications. In Proceedings of SPIE - The International Society for Optical Engineering. SPIE [10.1117/12.2232609].

Sorption-cooled continuous miniature dilution refrigeration for astrophysical applications

Coppi G.;
2016

Abstract

A progress report is provided on the development of a tiltable continuous miniature dilution refrigerator and associated 3He/4He sorption coolers. These systems are currently being developed to provide sub-Kelvin cooling of the bolometer arrays for several ground- and balloon-based experiments which aim to measure the polarization of the Cosmic Microwave Background (QUBIC, LSPE and POLARBEAR-2). The novel tiltable miniaturised system benefits from a lack of external circulation pumps and a mechanically simple design. The condenser of the twin-pumped recirculating diluter is cooled continuously by two 3He/4He sorption coolers. The sorption pumps are operated by convective heat switches. The dilution unit features a thermally separated mixing chamber, still and step heat exchangers. The designs and analyses of both the sorption coolers and the diluter are reported; both systems have been manufactured and are presently under test.
poster + paper
Bolometers; Cryogenics; Dilution refrigerators; Sorption coolers
English
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
2016
Proceedings of SPIE - The International Society for Optical Engineering
2016
9912
991266
none
May, A., Calisse, P., Coppi, G., Haynes, V., Martinis, L., Mcculloch, M., et al. (2016). Sorption-cooled continuous miniature dilution refrigeration for astrophysical applications. In Proceedings of SPIE - The International Society for Optical Engineering. SPIE [10.1117/12.2232609].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/314089
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