Well, it's a novel superconductor or a portable fusion plant.

Still, when you pasted it here, the 10^5 A-turns become 105 A-turns. For anybody that looks at it and thinks "hum... seems almost viable", it's just a formatting error :)

EDIT: Oh, but the proposed conductor is plasma composed of solar wind particles. It is reasonable to get a coil much larger than 300m with those.