LiteBIRD deep-freezes telescopes to probe the genesis of our universe

Researchers from Irig are working on the international LiteBIRD space observation satellite project.  They have been tasked with developing a cold machine that can deliver 2 microwatts at 100 mK—a level of performance never before achieved in space. The cold machine will be used on the two telescopes in the payload.

The researchers have opted for a four-stage magnetic refrigeration machine that is well-suited to the demands of space. Variations in a magnetic field are applied to a magnetocaloric material to produce cold. The researchers developed and patented a new magnetocaloric material, ytterbium gallium garnet, which offers unparalleled energy density. The design phase should be completed by the end of 2021.

Contact: jean-marc.duval@cea.fr

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