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Encyclopedia > Electron beam

A charged particle beam is a group of electrically charged particles that have approximately the same kinetic energy and move in approximately the same direction. Usually, the kinetic energies are much higher than the thermal energies of particles at ordinary temperatures.


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


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

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:

See also: electron beam technology


  Results from FactBites:
 
National Center for Electron Beam Food Research (644 words)
Walking on carpet can generate static electricity, that is, an electron (e-) similar to the illuminating electrons emitted by a light bulb, the electrons that form images on the picture tube of your television and electrons used to create Xrays for dental Xray imaging.
The speeding electrons damage and destroy bacteria in and on the food upon colliding with the bacteria.
Electron beam irradiation controls bacteria, molds, yeast, and insects which cause deteriation and spoilage and decrease the quality of fresh produce and other foods.
Joining Technologies News: Electron Beam Welding (1775 words)
Electron beam welding is a phenomena that is thoroughly understood by scientists and engineers that have studied the process in the research lab, but very little information is published for those of us that want to know more about the welding process performed with electron beam energy.
The focused beam of electrons is directed at a targeted location on the weld joint at which point the kinetic energy of the electrons is converted to thermal energy.
Beam Deflection - The movement of the electron beam by the electromagnetic coils or by undesirable magnetic or electrical fields.
  More results at FactBites »

 
 

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