Antigraviton Emitter
From Star Trek : Freedom's Wiki
The antigraviton emitter was a device that emitted antigraviton particles. This device was devleoped by Damar as part of an effort to disrupt the self-replicating minefield blocking off the Bajoran wormhole.
The emitter produced a field of antigraviton particles to fool proximity detonators on the self-replicating mines. With the detonators disabled, the entire minefield could be detonated simultaneously, thus preventing automatic replication of individual mines. (DS9: "Favor the Bold", "Sacrifice of Angels")