page_title: Electron gun
hierarchical_section_title: Electron gun
caption_attribution_description: This is a close up photo of a en:thermionic en:electron gun assembly found on a colour Samsung CRT monitor. The gun produces three high speed individual electron beams for the three primary colours (Red, Green and Blue).
context_page_description: An electron gun is an electrical component in some vacuum tubes that produces a narrow, collimated electron beam that has a precise kinetic energy. The largest use is in cathode ray tubes, used in nearly all television sets, computer displays and oscilloscopes that are not flat-panel displays. They are also used in field emission displays, which are essentially flat-panel displays made out of rows of extremely small cathode ray tubes. They are also used in microwave linear beam vacuum tubes such as klystrons, inductive output tubes, travelling wave tubes, and gyrotrons, as well as in scientific instruments such as electron microscopes and particle accelerators.
  Electron guns may be classified by the type of electric field generation, by emission mechanism, by focusing, or by the number of electrodes.
context_section_description: An electron gun (also called electron emitter) is an electrical component in some vacuum tubes that produces a narrow, collimated electron beam that has a precise kinetic energy.  The largest use is in cathode ray tubes (CRTs), used in nearly all television sets, computer displays and oscilloscopes that are not flat-panel displays. They are also used in field emission displays (FEDs), which are essentially flat-panel displays made out of rows of extremely small cathode ray tubes. They are also used in microwave linear beam vacuum tubes such as klystrons, inductive output tubes, travelling wave tubes, and gyrotrons, as well as in scientific instruments such as electron microscopes and particle accelerators.
  Electron guns may be classified by the type of electric field generation (DC or RF), by emission mechanism (thermionic,  photocathode, cold emission, plasmas source), by focusing (pure electrostatic or with magnetic fields), or by the number of electrodes.
caption: Electron gun from a cathode ray tube
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