Gas focusing
Encyclopedia
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.
Rather than being dispersed, a beam of charged particles travelling in an inert gas
Inert gas
An inert gas is a non-reactive gas used during chemical synthesis, chemical analysis, or preservation of reactive materials. Inert gases are selected for specific settings for which they are functionally inert since the cost of the gas and the cost of purifying the gas are usually a consideration...
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
Electric field
In physics, an electric field surrounds electrically charged particles and time-varying magnetic fields. The electric field depicts the force exerted on other electrically charged objects by the electrically charged particle the field is surrounding...
which applies a radially inward force to the particles in the beam.
- 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