Sorption-cooled continuous miniature dilution refrigeration for astrophysical applications

Andrew J. May; Paolo G. Calisse; Gabriele Coppi; Vic Haynes; Lorenzo Martinis; Mark A. McCulloch; Simon J. Melhuish; Lucio Piccirillo

doi:10.1117/12.2232609

22 July 2016 Sorption-cooled continuous miniature dilution refrigeration for astrophysical applications

Andrew J. May, Paolo G. Calisse, Gabriele Coppi, Vic Haynes, Lorenzo Martinis, Mark A. McCulloch, Simon J. Melhuish, Lucio Piccirillo

Author Affiliations +

Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 991266 (2016) https://doi.org/10.1117/12.2232609
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

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.

Citation Download Citation

Andrew J. May, Paolo G. Calisse, Gabriele Coppi, Vic Haynes, Lorenzo Martinis, Mark A. McCulloch, Simon J. Melhuish, and Lucio Piccirillo "Sorption-cooled continuous miniature dilution refrigeration for astrophysical applications", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 991266 (22 July 2016); https://doi.org/10.1117/12.2232609

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