Ion Defense Grid

The Ion Defense Grid was a superstructure that contained an intricate network of ion field generators that could combine their ionic energy into a single ionic pulse similar to a planetary ion cannon but with shorter range and the ability for the gunner to adjust the energy output based upon perceived threat level.

The tunnel within the Emporium where the Ion Defense Grid was installed had the local nickname of "Ion Alley".

Behind the scenes
The Ion Defense Grid was designed by Paul Danner and Bill Smith for Wretched Hives of Scum & Villainy, a supplement for the Star Wars Roleplaying Game that was published by West End Games in 1997.

It was mentioned as one of several defensive measures that was protecting Exovar's Emporium.