Hmmm. that seems like a very limited arc of fire for an anti-fighter/anti-missile weapon.
Though I have seen something like that before...the
Comet Empire battleships have a "Magna-shock cannon" set that seems to fuction by twisting the enemy ship or fighters in something like an energy tornado.
However it might just be a redesign of their FTL drive, much like Marika figured out that the
Odette II had a hidden weapon in its solar sail propulsion system. One of the Klingon axioms from their elite command academy is "On a warship, everything is a weapon".
In some respects the traditional Wave Motion Gun is just using the ship's engine as a weapon. Just directing all power into a concentrated beam of great power rather that using the same power through the drive sytems to make FTL travel possible.
It is fortunate that steam engines can't quite be used in this fashion, or else she'd have hundred thousand plus horsepower weapons on naval vessels in the 1920s.