Where are the capacitors in fusion transportation?

I often hear that fusion could be a huge improvement in transportation technologies from space to sea to potentially even air. And I see how that could be with steady-state fusion like a stellarator, just start it up on the ground or with some disposable energy storage. But for pulsed methods, how do you keep storing and releasing that much energy without capacitors? That would add too much mass and volume to your vehicle. Would an onboard fission reactor even have enough power? I'll grant I don't know much about this sort of energy storage.

Is there some other type of reusable energy storage? Or are there ways to more immediately direct the power back into another pulse?