Simulations of Beam Injection and Extraction into Ion Sources

Charge breeding, the injection of singly charged ions into Electron Cyclotron Resonance Ion Sources (ECRIS) to extract a highly charged ion beam, is a promising technique for producing beam of rare ions. Efficiency and extracted beam temperature are dominated by the strong collisional diffusion of ions. A program, named ’beam2ecr’, simulating details of the injection, ionization, collision and extraction processes is described. A model of the injection plasma sheath and of source fringe fields is now included and neutral injection is also supported. Results, clearly favouring near axis injection for most cases, are described. Code is written in C-language and with possibility of parallel execution over a Linux cluster.