A linear particle accelerator (often shortened to linac) is a type of particle accelerator that greatly increases the velocity of charged subatomic particles or ions by subjecting the charged particles to a series of oscillating electric potentials along a linear beamline; this method of particle acceleration was invented in 1928 by Rolf Wider e. Linacs have many applications, from the generation of X-rays for medicinal purposes, to being an injector for a higher-energy accelerators, to the investigation of the properties of subatomic particles. The design of a linac depends on the type of particle that is being accelerated: electrons, protons or ions. They range in size from a cathode ray tube to the 2-mile (3.2 km) long Stanford Linear Accelerator Center in Stanford, California.

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