[willis936]

Well, it creates a region in space with a high charge density that can be accelerated to a plate that has a voltage applied to it which it bumps into which then causes a current.

Importantly, this doesn't have to happen in the reactor vessel. The charged gas can be pumped somewhere else.

[DennisP]

It does have to happen in the reactor vessel. It's not just that it's a charged gas. It's that it's a charged gas which is exploding with almost 300 kWh of energy per shot.