They don't seem to say at any point how this system would work with rare earth magnets, if they are strong enough to produce a reaction or if it would be to slow or weak, so then you are stuck using electro magnets, they also point out that there is no good way to make one that uses a fluid, so you are stuck moving a solid, the working examples either use a disk or a reciprocating device.
But in most of the artical they talk about using liquid helium as a coolant, I realize we all have tanks of that around.
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