electron gun

Thân thiện

An electron gun fires a focused beam inside a vacuum tube.

Definition

1. Noun:
   • A device that produces and directs a focused beam of electrons: An electron gun is the electrode assembly that serves as the source of electrons in devices like cathode-ray tubes (CRTs) and electron microscopes. It consists of a cathode that emits electrons and components that accelerate and focus them into a precise beam.

Usage

• Noun:
  • The image on the old television was created by an electron gun scanning the inside of the screen.
  • In an electron microscope, the electron gun provides the beam of electrons used to illuminate the specimen.
  • The malfunctioning electron gun caused the display to go dark.

Advanced Usage

• Technical Context: The term is primarily used in physics, engineering, and electronics to describe a critical component in vacuum tube technology.
  • The design of the electron gun determines the resolution and brightness of the resulting image.

Variants and Related Words

• Cathode: (noun) The negatively charged electrode within the electron gun from which electrons are emitted.
• Electron Beam: (noun) The stream of electrons produced and shaped by the electron gun.
• CRT (Cathode-Ray Tube): (noun) A common device, such as in old televisions and monitors, that utilizes an electron gun.

Synonyms

• Electron Source: A general term for a device that generates electrons.
• Beam Source: A broader term for a device that produces a directed beam of particles or energy.

Related Phrases

• "The gun of a CRT": A common informal reference to the electron gun in a cathode-ray tube.
  • Replacing the gun of a CRT requires precise calibration.

Học thuật

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