1. The process by which high-energy, high-current electron beams are transported from an accelerator through a medium of high-pressure gas directly to an intended target.
2. A device used in atomic physics to produce highly charged ions by bombarding atoms with a powerful electron beam.
3. The technique of transporting high-energy, high-current electron beams from an accelerator to a target through a region of high-pressure gas by creating a path through the gas where the gas density may be temporarily reduced.

The gas may be ionized; or a current may flow whose magnetic field focuses the electron beam on the target.