Just use a (waved/nonwaved) superconductor for the coil, that should be easy for Fen.
You need it for both the rail- and the coilgun anyways to sidestep the heat for transfering the electric energy. Of course with a railgun, you also have to worry about the friction.
You need it for both the rail- and the coilgun anyways to sidestep the heat for transfering the electric energy. Of course with a railgun, you also have to worry about the friction.