Abstract
A space charge or plasma lens consists of an axial electron trap produced with biased ring electrodes and an axial magnetic field to inhibit radial motion of electrons. It is useful for high current ion beams because it does not remove the neutralizing electrons from the beam. In this paper the design of the space charge trap is discussed qualitatively, the focal length is derived for a simple geometry, and a space charge lens in use in a 400 keV−25 mA deuteron beam transport system is described.
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