High efficiency plasma recombustion
The High efficiency plasma recombustion (HEPlaR) is a very high impulse and high thrust reaction drive.
First developed at TL-10. It consists of an heat exchanger recombustion chamber added to a fusion power plant. Hydrogen is injected into the recombustion chamber and the power generated by the engine heats the hydrogen to a plasma state. The plasma is them released as a high velocity stream of reaction mass, providing thrust. Because the engine is used to heat the plasma, this effectively drains the engine heat, reducing the power output of the engine in proportion to the thrust of the drive.