4HE High-Fusion Reactor

The 4HE High-Fusion Reactor was a state of the art engine configuration utilized by Starfleet beginning on Renovamen class starships.

Unlike deuterium/anti-deuterium reactions, these used Helium-4, the most stable and energetic isotope of helium. Synthesized through 4 nucleons and 2 electrons and then 4 anti-nucleons and 2 positrons. Once collided a energy output 23% more energetic and stable than deuterium/anti-deuterium collisions is sent throughout the ships plasma grid.

In convective cores, radioactivity and subatomic instabilities formed by these collisions could be suppressed and then reused [as of 2475] for 3 hours, giving a whole new meaning to engineering.