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Starting 2 days before launch, we top off the helium dewar with superfluid liquid helium. Helium at atmospheric pressure is liquid at 4.2 Kelvin, while our dewar keeps the helium at 1.3 Kelvin by keeping it under vacuum. In space there's lots of vacuum for free, but here we need to provide it with pumps. To fill the dewar with 1.3 K helium we need to pump on the storage tank, and transfer it under vacuum. Then we launch!
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