im seeing this as probably a plasma beam or something along those lines. as the energy builds it opens up and when it finishes "chargeing" it closes and focuses the energy to a single point just before fired as a beam for 1-10 seconds depending on the class of ship its fit to. now the counter would be a EMP to desable the plasma containment thus destroying the gun and posably a bit of damage or you could damage/destroy one of the lower prongs to have the plasma disscharge into the hull...whelp i have a "Ecperimental Weapon" for the large med tech faction now '3' not 100% on the spelling but meh
I've always longed for something in a space sim game akin to the Gravity Wave Cannon in Martian Successor Nadesico. Sorry if this seems like a random tangent, I was simply reminded by the use of the accelerator foils.