Assertion: cathode ray tube's electron gun | /r/HasProperty | formed
Facets:
value: from several parts
type: OTHER
Source sentences:
text: A direct current, electrostatic thermionic electron gun is formed from several parts: a hot cathode, which is heated to create a stream of electrons via thermionic emission, electrodes generating an electric field to focus the electron beam (such as a Wehnelt cylinder), and one or more anode electrodes which accelerate and further focus the beam.