Not really clear to me why the choke wire needs to be superconducting too, or indeed if it really is superconductive in any important sense of the word. The poi

Not really clear to me why the choke wire needs to be superconducting too, or indeed if it really is superconductive in any important sense of the word. The point seems to be that the choke wire quenches easily and provides heat from internal resistance. Also, this sounds like it is purely a switching transistor since superconductors aren't really grey-area type of things, you get them in the superconducting state or in the normal state and the transition is about as smooth as that from water to steam.