Let's assume that we have an object in vacuum, venting hydrogen plasma around itself. This object has a powerful internal electrical source, connected to a cage of superconducting wire around it, in order to generate a magnetic field.
The goal is to retain as much of the emitted hydrogen plasma around itself as possible. The plasma must surround it in all side, leaving no "hole" around it. Is there a configuration for the superconducting loops that can generate a magnetic field that will retain the plasma around the object and the cage?
Ideally, the cage would also prevent the plasma to also come too close to itself and the object, but this is not mandatory.