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The high energy and directionality of charged particle beams make them useful for applications.

For practical purposes, a charged particle beam is characterized by:

• the energy of the particles, typically expressed in ( kilo/ mega) electron Volt,
• the intensity of the particle current, expressed in ampere.

Both properties are often synthesized into the perveance .

Strictly speaking, a third parameter is required to characterize a charged particle beam, such as the emittance , which is a measure of the degree to which the particle trajectories are non-laminar.

The (technologically) most important types of charged particle beams are:

• Electron beams, consisting of electronThe electron (also called negatron commonly represented as e&minus is a subatomic particle. In an atom the electrons surround the nucleus of protons and neutrons in an electron configuration. Electrons have the smallest electrical charge and when they movs.
• ion beam s, consisting of ions.

See also: electron beam technologyIn electron beam technology, an electron beam is applied to do some useful work. Given the wide range of energies and intensities of electron beams that can be generated, the range of applications is equally large: cathode ray tubes melting welding drilli