Thanks for your comment, it's always good to have more input.

In reply to this comment by IMSabbel:
I registered just to correct this description:

There is a difference between superfluidity and a bose einstein condensate. The effect of superfluid Helium might be descriped by the BEC theory, but its far from a "real" one in the theoretical sense. (otherwise, the creation of those wouldnt have been worth a nobel price not too long ago)

The exact explanation is a bit to long for that comment-field, but lets say that the demands for a BEC are _much_ higher than for superfluidity.

To get all atoms to occupy the lowest quantum state, such crude ways like the shown double dewar wont do it.
In fact, normally you would use a penning-trap, and do laser and evaporation cooling to get a few 100k atoms at the end with temperatures in the microkelvin range.


But superfluidity in itself is cool enough: You can also use it as near perfect cooling liquid (and you DO, for example in the LHC): Superfluid helium has _no_ thermal resitance. Heat can spread in it with the speed of sound, allowing the transportation of heat for km with only a minimal temperature rise.
Otherwise, supplying all those magnets in the LHC-Tunnels would be next to impossible.