page_title: Cyclotron
hierarchical_section_title: Cyclotron
caption_attribution_description: English: University of Washington Cyclotron This cyclotron is produces a proton beam. This beam can be used to produce a neutron beam which is used for cancer therapy. The other use is to produce radionuclides which are used in other cancer therapys.
context_page_description: A cyclotron is a type of particle accelerator invented by Ernest Lawrence from the University of California, Berkeley in 1930. 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 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.
context_section_description: A cyclotron is a type of particle accelerator invented by Ernest Lawrence from the University of California, Berkeley in 1930. 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.
caption: A modern Cyclotron for radiation therapy
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