electron guns

An electron gun is a device that produces a focused beam of electrons, often used in devices like televisions, electron microscopes, or cathode-ray tubes. It works by heating a metal filament or applying a high-voltage electric field to a metal surface, causing electrons to be emitted through a process called thermionic emission or field emission. These emitted electrons are then accelerated and focused into a narrow beam using electric or magnetic fields. This electron beam can be directed precisely for imaging, scanning, or imaging purposes, enabling detailed examination or display of materials or images.