electron gun

Noun
  1. The electrode that is the source of electrons in a cathode-ray tube or electron microscope;
    Consists of a cathode that emits a stream of electrons and the electrostatic or electromagnetic apparatus that focuses it (synset 103282060)
    is a type of: electrode - a conductor used to make electrical contact with some part of a circuit
    is a part of:
    • cathode-ray tube, crt - a vacuum tube in which a hot cathode emits a beam of electrons that pass through a high voltage anode and are focused or deflected before hitting a phosphorescent screen
    • electron microscope - a microscope that is similar in purpose to a light microscope but achieves much greater resolving power by using a parallel beam of electrons to illuminate the object instead of a beam of light

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