A Quasi-3d Model of Electron Cyclotron Resonance Ion Source*

FAR-TECH, Inc. is developing a hybrid, quasi-three dimensional (Quasi-3D) model to simulate charge breeding of a test 1+ or 2+ ion beam in an electron cyclotron resonance ion source (ECRIS). The model is a combination of three dimensional (3D) mapping of the plasma background calculated by a 1D Generalised ECRIS Model (GEM-1D) [1] and 3D tracking of the ion trajectories with Monte Carlo Charge Breeding Code MCBC [2]. The background plasma on axis that is calculated self-consistently in GEM-1D is mapped to 3D space using the conservation laws of energy and magnetic moment. The test beam ions are then tracked in the plasma using MCBC which includes Coulomb, ionization and charge exchange collisions. The exact ion trajectories in the plasma and steady state 3D ion distribution at the extraction aperture are predicted and compared with the experiments on rubidium (Rb) charge breeding at Argonne National Laboratory (ANL).