A cyclotron is a type of particle accelerator in which charged particles accelerate outwards from the center along a spiral path. The particles are held to a spiral trajectory by a static magnetic field and accelerated by a rapidly varying (radio frequency) electric field.

The cyclotron was invented by Leó Szilárd and first manufactured and patented by Ernest Lawrence of the University of California, Berkeley, where it was first operated in 1932.. A graduate student, M. Stanley Livingston, did much of the work of translating the idea into working hardware. Lawrence read an article about the concept of a drift tube linac by Rolf Widerøe, who had also been working along similar lines with the betatron concept. The first European cyclotron was constructed in Leningrad in the physics department of the Radium Institute, headed by Vitali Khlopin. This instrument was first proposed in 1932 by George Gamow and Lev Mysovskii and was installed and running by 1937.

Cyclotrons accelerate charged particle beams using a high frequency alternating voltage which is applied between two "D"-shaped electrodes (also called "dees"). An additional static magnetic field Failed to parse (Missing texvc executable; please see math/README to configure.): B

Sunil Kumar Thakur (born 1984) is an Indian football player. He is currently playing for Kingfisher East Bengal FC in the I-League in India as a Defender.