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Duoplasmatron, an invention of Manfred von Ardenne, is a type of ion beam source. The duoplasmatron operates as follows: a cathode filament emits electrons into a vacuum chamber. A gas such as Argon is introduced in very small quantities into the chamber, where it becomes charged or ionized through interactions with the free electrons from the cathode, forming a plasma. The plasma is then accelerated through a series of at least two highly charged grids, and becomes an ion beam, moving at fairly high speed from the aperture of the device.

The Duoplasmatron has been used for applications as diverse as semiconductor manufacture, and spacecraft propulsion.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Duoplasmatron". A list of authors is available in Wikipedia.
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