BECRIS - a 5 GHz ECR source for a CN Van de Graaff

A compact ECR source, BECRIS (Berlin Electron Cyclotron Resonance Ion Source), has been developed. Only permanent magnets were used to obtain the magnetic field configuration for a radio frequency of 5 GHz. The source operates at external pressures up to 6 atm. It has been installed on the high voltage terminal of a 6 MV CN Van de Graaff accelerator which is used as a stand-alone machine and as an injector of the VICKSI cyclotron at HMI. With a total power consumption of less than 1 kW both, high currents of lowly charged and reasonable currents of highly charged ions, have been produced. This source improves the intensity and energy variability of beams with single-ended machines. Test results and first operating experience with the source on the high-voltage terminal on the CN are presented. (orig.)