22 July 2016 Sorption-cooled continuous miniature dilution refrigeration for astrophysical applications
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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.
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Andrew J. May, Andrew J. May, Paolo G. Calisse, Paolo G. Calisse, Gabriele Coppi, Gabriele Coppi, Vic Haynes, Vic Haynes, Lorenzo Martinis, Lorenzo Martinis, Mark A. McCulloch, Mark A. McCulloch, Simon J. Melhuish, Simon J. Melhuish, Lucio Piccirillo, 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); doi: 10.1117/12.2232609; https://doi.org/10.1117/12.2232609


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