Abstract
In the absence of a magnetic guide field, intense relativistic electron beams will not propagate because the electrostatic repulsive forces always dominate the magnetic pinching forces. It is necessary to have some background ions to reduce the space charge of the beam. With a sufficiently strong magnetic guide field in the direction of propagation, it is, in principle, possible to have an equilibrium with no ions. The theoretical basis for un-neutralized propagation and beam focusing is presented. Experiments have been carried out that indicate qualitative changes in beam propagation and focusing with a guide field.
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