Herschels cryostat vacuum vessel
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Herschel’s cryostat vacuum vessel

March 5, 2009
The Herschel cryostat vacuum vessel, seen here in the ESTEC cleanroom, stores 2370 litres of superfluid liquid helium (He II) which is used to help cool the various elements of the detector plane. Once in orbit, the black outer half of the vessel faces away from the Sun and acts as a radiator while the reflective half will face the inside of the sunshade and reflect excess heat.

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