electron-gun

electron gun

noun Electronics, Television.
a device consisting of the cathode ray tube, which emits electrons, and a surrounding electrostatic or electromagnetic apparatus, which controls, focuses, and accelerates the stream of electrons (electron beam)
Also called gun.


Origin:
1920–25

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
electron gun
 
n
a heated cathode with an associated system of electrodes and coils for producing and focusing a beam of electrons, used esp in cathode-ray tubes

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
electron gun  
The part of a cathode-ray tube that emits a narrow beam of electrons, consisting of a cathode, control grids, and usually a heater. Electrons are emitted from the cathode, which is typically heated by electric current to give the electrons escape energy. The electrons are then focused into a beam by the electric fields of the control grids.
The American Heritage® Science Dictionary
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