Main Question or Discussion Point
If tokamaks were to be run continuously, somehow, then fusion would produce a lot of helium. But since the charge to mass ratio of helium is exactly the same as deuterium, both of them behave almost exactly he same in electric or magnetic fields. And tritium on the other hand has a lower charge to mass ratio. So, if both deuterium and helium behave exactly the same, then how do tokamaks extract helium from the plasma for operation and make sure deuterium and tritium are both still in the tokamak?