I was thinking in terms of Dyson spheres—fusion reactor complete with fuel supply and confinement system already provided, just build collectors. But if you propose dismantling stars and building electromagnetically confined fusion reactors instead, it doesn’t matter; if you want stellar power output, you need square AUs of heat radiators, which will collectively be just as luminous in infrared as the original star was in visible.
Eliezer,
I was thinking in terms of Dyson spheres—fusion reactor complete with fuel supply and confinement system already provided, just build collectors. But if you propose dismantling stars and building electromagnetically confined fusion reactors instead, it doesn’t matter; if you want stellar power output, you need square AUs of heat radiators, which will collectively be just as luminous in infrared as the original star was in visible.