The electron racetrack

Electrons emitted by an electron gun are first accelerated in a linear accelerator (linac) and then transmitted to a circular accelerator (booster synchrotron) where they are accelerated to reach an energy level of 6 billion electron-volts (6 GeV).

These high-energy electrons are then injected into a large storage ring --844 metres in circumference --where they circulate in a vacuum environment, at a constant energy, for many hours.