Effect of plasma density on high current beam extracted from a MEVVA ion source

Metal vapor vacuum arc (MEVVA) ion source has been developed to produce a high particle current to fill up the heavy ion synchrotron SIS to its space charge limit at GSI. To deliver the desired ion beam, a multi-aperture triode extraction system is used due to high mass to charge ratio of the design ion ²³⁸U4⁺. In an attempt to generate ion beams with high current and high brightness for the design ion, a fully three dimensional code KOBRA3-INP was used to investigate the behavior of the uranium ion beam extracted from the high current MEVVA ion source and the effects of plasma density on the extracted high current beam in the combined extraction system consisting of an extraction system and a post-acceleration system. The space charge map in the extraction system, the beam trajectories in the combined extraction system and the emittance patterns at the end of the combined extraction system are presented.