I was just playing and noticed that there were deployable antiproton plasma and disruptor turrets in my inventory.
I cant remeber ttaking them up or buying them. Is that a new feature of some kind? Since i fly acruiser i dont use cannons or turrets
Rewards for DOFF missions. I think they are diplo or trade.. "Purchase Plasma Torpedo Satellite" or something like that. There is also two part versions where you first do a DOFF mission to earn the plans, then a doff mission to build the device.
Check your doff mission log and you'll see what you did.