Phase transition coil
A phase transition coil was the component in the transporter device that converted a person or object from matter to energy and back again.

The transition coils of the 's transporter system were ruled out as having caused the transporter malfunction resulting in Ambassador 's apparent death shortly after stardate 44390.1, as they had been replaced only a week earlier. ()

When weapons were beamed to a rebel camp on Krios from a cargo transporter of the Enterprise-D, Geordi La Forge ordered to run a level-1 diagnostic of the phase transition coil. () 

When the  achieved contact with a Romulan science vessel via a micro-wormhole in 2371, they attempted to transport a test cylinder to the ship. Due to the complexity of the transport and a phase variance, power to the phase transition coils had to be increased. ()

Later that year, Kathryn Janeway set the phase transition coils to maximum in preparation for rematerializing a victim of the metreon cascade whose bodily fragments were widely scattered. ()

fr:Bobine de transition de phase
de:Phasenumwandlungsspule
Transporter technology