I-a2b solar ionization reactor
From Wookieepedia, the Star Wars wiki.
The I-a2b solar ionization reactor was a stardrive system developed and produced by Sienar Fleet Systems.
Characteristics
Often described as a "miniature sun", and incorporating one of the largest single hyperspace field generators ever designed, the massive reactor system occupied more than half of the Imperial-class Star Destroyer's interior. Unlike the reactor system on the older Venator-class, the reactor on board Imperial-class vessels was large enough relative to the rest of the ship to protrude with a ventral bulb. It also forced the troop and crew compartments to be located on the upper half of the superstructure. It is not always appreciated that it was the massive Sienar power-plant which dictated the vast size of the Imperial: in effect, Lira Wessex and her team at Kuat Drive Yards designed the Star Destroyer around the Sienar drive systems.
A version of the I-a2b was later adapted for use in the Bakura-class destroyer.
