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File:1937-French-Cyclotron - University of Washington.jpg
A French cyclotron, produced in Zurich, Swisserland in 1937
A modren cyclotron for radiation therapy

A cyclotron is a teep o pairticle accelerator in which chairged pairticles accelerate ootwards frae the center alang a spiral path. The pairticles are held tae a spiral trajectory bi a static magnetic field an acceleratit bi a rapidly varyin (radio frequency) electric field.