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This paper discusses the capture of an ion beam in a magnetized plasma of anElectron Cyclotron Resonance Ion Source based Charge Breeder, as modelled bynumerical simulations. As a relevant step forward with respect to previousworks, here the capture is modeled by considering a plasma structure determinedin a self-consisent way. The plasmoid-halo structure of the ECR plasma - thatis consisting of a dense core (the plasmoid) surrounded by a rarefied halo - isfurther confirmed by the self-consistent calculations, having also some finestructures affected by the electromagnetic field distribution and by themagnetostatic field profile. The capture of Rb1+ ions has been investigated indetails, vs. various plasma parameters, and then compared to experimentalresults.

Self-consistent simulations of ECR-based charge breeders: evidence and impact of the plasmoid-halo structure