the Caplan Thruster would sit close to the Sun, using electromagnetic fields to gather hydrogen and helium from the solar wind to use as fuel.
That would power two jets of energy – one using helium, pushed through a fusion reactor to create a jet of radioactive oxygen that would move the Caplan Thruster forward, and one using hydrogen, to maintain distance from the Sun and to push it forward.
As solar wind alone wouldn't provide enough fuel, we would also need some kind of Dyson sphere structure too, which would concentrate sunlight into a specific spot on the Sun to increase temperatures (and power output) even further.
