Remmler array

Star Trek: The Next Generation
Episode: TNG 244 - Starship Mine

The Enterprise-D arrived at the Remmler Array to undergo a baryon sweep, a procedure that scans the ship with deadly rays, in order to eliminate accumulated particles which have collected on the vessel over years of space travel.

Picard returned to his ship to retrieve his saddle, and discovered that terrorists had boarded his ship while the sweep was underway.