Developing a long duration 3He fridge for the LSPE-SWIPE instrument

Gabriele Coppi; Paolo de Bernardis; Andrew J. May; Silvia Masi; Mark McCulloch; Simon J. Melhuish; Lucio Piccirillo

doi:10.1117/12.2232448

22 July 2016 Developing a long duration ³He fridge for the LSPE-SWIPE instrument

Gabriele Coppi, Paolo de Bernardis, Andrew J. May, Silvia Masi, Mark McCulloch, Simon J. Melhuish, Lucio Piccirillo

Proceedings Volume 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II; 991265 (2016) https://doi.org/10.1117/12.2232448
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

Abstract

A ³He sorption cooler design for the Short-Wavelength Instrument for the Polarization Explorer (SWIPE) of the Large-Scale Polarization Explorer (LSPE) balloon-borne experiment is described. The aim of this experiment is the detection of the primordial B-mode polarisation component of the Cosmic Microwave Background. The SWIPE instrument will use Transition-Edge Sensors that are designed to work at temperature of almost 300 mK. Therefore, a ³He sorption cooler has been specifically designed that can reach this temperature with a heat load of up to 25 μW. The fridge is compact in order to be housed inside the SWIPE cryostat and operate vertically. It has been designed to have a cycle duration of at least 7 days. In order to meet these specifications, the fridge will be charged with 0.75 moles of ³He.

Citation Download Citation

Gabriele Coppi, Paolo de Bernardis, Andrew J. May, Silvia Masi, Mark McCulloch, Simon J. Melhuish, and Lucio Piccirillo "Developing a long duration ³He fridge for the LSPE-SWIPE instrument", Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 991265 (22 July 2016); https://doi.org/10.1117/12.2232448

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KEYWORDS

Helium

Polarization

Liquids

Copper

Resistance

Sensors

Adsorption

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