A heavy, shoulder-fired energy weapon carried by Starfleet in the 2370s, used by Worf to shoot down Son'a drones during the defence of the Ba'ku.
The isomagnetic disintegrator appears in Star Trek: Insurrection. When Picard and his officers defy orders and return to the Ba'ku planet to protect its people, they bring a stock of weapons from the Enterprise-E in the captain's yacht, and this is the largest of them.
As the villagers are led into the hills, the Son'a send small flying drones that fire isolinear tags into people so they can be beamed away. Phaser rifles are used against most of them.
Worf carries the disintegrator on his shoulder like a rocket launcher and uses it to blast drones out of the air. It is one of very few heavy infantry weapons shown in Starfleet hands.