the world > matter > physics > atomic physics > particle physics > particle avoiding strong interaction > electron > [noun] > device emitting beams (3)
a device in which electrons obtained by thermionic emission from a heated cathode are emitted as a narrow beam.
= electron gun n. at electron, n.2 compounds 2. Also attributive, as gun electrode.
Physics. A device in which a beam of particles is made to describe a sinusoidal path (and so emit radiation) by a series of transverse electric or…