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File:Doomsday Machine 2.jpg

The "doomsday machine" fires a pure antiproton beam.

An antiproton beam is a confined beam of antiprotons.

Encountered in 2267, the "doomsday machine" used a beam of pure antiprotons (an incredible scientific concept, at the time) as its primary weapon, capable of destroying whole planets. (TOS: "The Doomsday Machine")

When she was undercover with the Maquis, Seska developed a tactic by which she disabled the computer core of a Cardassian frigate above Bajor with a modified antiproton beam that penetrated its shields and hull. In 2372, Chakotay attempted to use the same tactic against Maje Culluh's Kazon raider, but Seska anticipated his plans and captured him. (VOY: "Maneuvers")

The Jem'Hadar used a type of antiproton beam to detect the USS Defiant through its Romulan cloaking device. The Cardassians later used this technique when the Defiant was hijacked by the Maquis in 2371. However, Thomas Riker, commanding the captured vessel, was able to negate the beam by adjusting the resonance frequency of the cloaking device. (DS9: "The Search, Part I", "Defiant")

In an alternate timeline, Doctor Phlox used a focused antiproton beam to eliminate interspatial parasites in the brain of Jonathan Archer. (ENT: "Twilight")
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