electron gun
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electrical component producing a narrow collimated electron beam
~5 min read
Encyclopedic overview
Electron gun from a cathode-ray tube The electron gun from an RCA Vidicon video camera tube
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.
Excerpted from Wikipedia’s “electron gun” article, available under the CC BY-SA 4.0 licence.