Analysis and recombination of multiple-charge-state beams from an electron cyclotron resonance ion source

Abstract

To meet the beam power requirements for high-intensity ion linacs being proposed for rare isotope beam production and other nuclear physics applications, we have developed an injector system to extract, accelerate, analyze, and recombine multiple charge states of any heavy-ion beam. The injector consists of an electron cyclotron resonance ion source, a 100 kV platform and an achromatic low-energy beam transport system. Two charge states of bismuth-209 (20+ and 21+) were successfully accelerated by the high-voltage platform potential, separated and perfectly recombined in the transverse phase space with 100% transmission. The perfect recombination and maximum transmission of the cw beam are essential for smooth injection into a subsequent rf accelerator.