Optimization of a compact electron beam ion trap/source for the generation of low-Z highly charged ions

The optimization of an electron beam ion trap/source (EBIT/S) for the generation of low-Z highly charged ions through several iterations of simulations is presented. Software packages Maxwell RZ and MICHELLE were used to compare the effects of electrode assembly materials and geometries on the relevant electric and magnetic fields for shaping the ionizing electron beam. COMSOL was used to examine trapped ion trajectories and inform production rates. The optimization of the electromagnetic fields and ionizing electron beam is achieved through computational simulation. The final design was constructed and characterized. This method of analysis before assembly allows ion source designs to be adapted for targeted purposes or to fit practical constraints. To compensate for the effects of new adaptations, dimensions and materials may be varied in these simulations until the desired fields and electron beam profile are recovered. The final assembled EBIT/S designed for the Cryogenic Ultrahigh vacuum Radioactive Ion Experiment (CURIE) at the University of Maryland, College Park, is compact, cryogen-free and generates multiply charged ions of low-Z neutrals. The CURIE EBIT/S and beamline has been used to generate, filter, and observe argon ions up to charge state q = 8.