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{{Short description|Accelerates particles with a static electric field}}
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[[Image:Westinghouse Van de Graaff atom smasher - cutaway.png|thumb|upright=1.5|The [[Westinghouse Atom Smasher]], an early [[Van de Graaff accelerator]] built 1937 at the Westinghouse Research Center in Forest Hills, Pennsylvania. The cutaway shows the fabric belts that carry charge up to the mushroom-shaped high voltage electrode. To improve insulation the machine was enclosed in a 65 ft. pressure vessel which was pressurized to 120 psi during operation. The high pressure air increased the voltage on the machine from 1 MV to 5 MV.]]
[[File:KEK Cockcroft-Walton Accelerator (1).jpg|thumb|upright=1.5|750 keV [[Cockcroft-Walton accelerator]] initial stage of the [[KEK]] accelerator in Tsukuba, Japan. The high voltage generator is right, the ion source and beam tube is at left]]
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