Abstract
It is known that, in intense ion beams being developed for use in neutral injection, the space charge of the ions is almost totally compensated by electrons. In the limit of total compensation, it is shown that there is a critical ion current, Ic, above which transport is no longer emittance but magnetic self-field dominated. A Monte Carlo model of beam neutralization in the presence of the self-field is presented and applied to the example of the JET injectors. Results show a foreshortening of the injector focus, a rise in beamlet emittance, and an increase in the angular divergence (of order 0.1°) in high current neutral injectors. It is shown that, because of stochastic neutralization effects, there is a fundamental limit to the ability to focus an injector uniquely.
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