Gas focusing, also known as ionic focusing.
Rather than being dispersed, a beam of charged particles travelling in an inert gas environment sometimes becomes narrower. This is ascribed to the generation of gas ions which diffuse outwards, neutralizing the particle beam globally, and producing an intense radial electric field which applies a radially inward force to the particles in the beam.
References
Sabchevski S P and Mladenov G M 1994 J. Physics D: Applied Physics 27 690-697
Mladenov G., and Sabchevski S., Potential distribution and space-charge neutralization in intense electron beams - an overview "Vacuum", 2001,v62, N2-3, pp. 113–122
See also
Vacuum tube
Teleforce
External links
Ionic focusing[permanent dead link]
Hellenica World - Scientific Library
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