
A microtron is a type of particle accelerator concept originating from the cyclotron in which the accelerating field is not applied through large D-shaped electrodes, but through a linear accelerator structure. The classic microtron was invented by Vladimir Veksler. The kinetic energy of the particles is increased by a constant amount per field ch...
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http://en.wikipedia.org/wiki/Microtron

an electron accelerator in which the electrons are guided in circular orbits tangential to each other (at one point) and of increasing radii under the influence of a constant magnetic field; they are accelerated at the beginning of each orbit by traversing a cavity resonator in which there is a radio-frequency electric field
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=881-06-30
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