Cyclotron

A cyclotron is a type of particle accelerator invented by Ernest Lawrence from the University of California, Berkeley in 1930.^[1] It accelerates charged particles by whirling them in a circle. The first cyclotrons were the size of a hand. Some modern circular accelerators use a circle as wide as a city.

Cyclotrons use perpendicular magnetic field to bend electrons and particles through into a semicircular path by an applied electric field. The applied electric field accelerates electrons between the "D" electrodes(also called "dees") of the magnetic field region.

The accelerating electric field reverses just at the time the electrons finish their half circle, so that it accelerates them across the gap. With a higher speed, they move in a larger semicircle. After repeating this process several times, they come out the exit port at a high speed.

1. ↑ Alonso, M.; Finn, E. (1992). Physics. Addison Wesley. ISBN 978-0-201-56518-8.