The Bussard collector, also known as a Bussard ramscoop or ramscoop, is a device usually attached to the forward end of a engine nacelle.
The main function of a Bussard collector is to collect interstellar hydrogen atoms for fuel replenishment. The device consists of a set of coils which generate a magnetic field. Collected gases are compressed and stored into holding tanks.
The basic principles behind the Bussard collector came from Robert W. Bussard's design of the Bussard ramjet, a propulsion system meant for interstellar spaceflight. Most starships are equipped with Bussard collectors, which are positioned in the best line of sight to collect particles. Collection works best in regions where particle density is high like solar systems or nebulae.
The Bussard collector normally collects hydrogen, especially deuterium for fuel replenishment but can be reconfigured to collect various gases like sirillium and plasma particles. A Bussard collector can also be reconfigured to expel gases or plasma.