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A cross-section of DS9's central core, the fusion reactors at the lower part of the core

A fusion reactor was a type of power generator, which used nuclear fusion to generate energetic plasma for various uses. Other names for this reactor included fusion power plant and fusion generator.

In the 22nd century, the Delphic Expanse spheres were powered by seven fusion reactors, each being almost twelve kilometers in length. (ENT: "Anomaly (ENT)")

The DY-500-class starships used Yoyodyne Pulse Fusion, a form of nuclear fusion power to achieve warp propulsion. (TNG: "Up The Long Ladder", production art)

The impulse drive of Federation starships was generated by fusion reactors, part of the fusion reaction subsystem. Aboard the Galaxy-class starships, the primary systems were located on decks 23 and 24. (TNG: "Contagion", display graphic) These were referred to as impulse reactors when used for this function. (ENT: "The Seventh")

Galaxy-class vessels are equipped with multiple fusion reactors. In 2367, a spaceborne lifeform known as Junior attached itself on the secondary hull of the USS Enterprise-D, and began feeding on power from the ship's fusion reactors. (TNG: "Galaxy's Child")

The fusion reactor in the Uxbridge house on Rana IV would last for five more years in 2366 before it would run out of energy. (TNG: "The Survivors")

In 2367, each of the Argus Array's antennae was powered by its own fusion reactor, controlled by a single computer. In all, there were eighteen reactors aboard the telescope. (TNG: "The Nth Degree")

The Cardassian-built Deep Space 9 utilized fusion reactors. Those reactors featured carbon reaction chambers and laser fusion initiators to generate power; the system was described as "bloody inefficient" by Miles O'Brien in 2369. Cardassian operational guidelines allowed operating efficiency to fall as much as 20% below normal. To boost efficiency, O'Brien increased the deuterium flow to the carbon reaction chamber, while Anara monitored the exhaust plasma temperature. The Cardassian computer did not accept this procedure and shut down reactor two due to a potential overload of the reaction chambers. (DS9: "The Forsaken")

The Cardassian transport vessel, Bok'Nor used a form of fusion power for their propulsion system. (DS9: "The Maquis, Part I")

In late 2369, O'Brien came late for repairs in the security office because another fusion reactor had gone down. (DS9: "In the Hands of the Prophets")

The self-destruct sequence of DS9 involved the computer ordering the station's main fusion reactor to disengage the reaction stabilizers, causing the reactor to overload, and the station to destroy itself. This could be prevented by manually disengaging the laser fusion initiators in the reactor room or a control junction on level 34. (DS9: "Civil Defense")

In 2372, the USS Voyager nearly drained its fusion reactors while attempting to land safely amid a massive electrical storm, produced by the Sky Spirits. (VOY: "Tattoo")

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