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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")
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 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")