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Memory Beta, non-canon Star Trek Wiki
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Memory Beta, non-canon Star Trek Wiki

The annular confinement beam or ACB was a vital component in virtually all 23rd century to 24th century transporter mechanisms. These safeguarded the matter stream of an object, while the quantum factor was separately beamed to the target. The ACB generally used back-up from the energizing coils and pattern buffer to ensure a successful and safe transport. It also had a discriminating filter for any potentially dangerous substances. Disruptions in the cycle of re-materialization yielded a large release of energy with risk to an increase of signal degradation. Sometimes attributed to a "Pauli Effect", when the amount of matter was not compensatable to the given energy output. (TOS novel: Ex Machina)

Background[]

This may explain why, even in mid-transport, Kirk and the others in TOS episode: "Bread and Circuses" beamed safely out of the cell, while bullets passed harmlessly through them. And such when disruptor fire did the same in TOS movie: Star Trek VI: The Undiscovered Country. The weapon discharge-deactivation from TNG episodes: "Datalore", "The Most Toys" was partly attributed to the annular confinement beam.

The 22nd century had yet to deploy this method of transport when Major Joss Hayes died from a Xindi weapon shot in ENT episode: "Countdown".

In 2372 a group of Talaxians were lost into a quantum fissure after their ACB was hit by ionized lightning. (VOY comic: "Under Ion Skies")

External link[]

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