Chargebreeding with the MAXEBIS

The demand of exotic ions prior to their injection into an accelerator has driven the development of the charge breeding method. Existing facilities like REX-ISOLDE or ISAC at TRIUMF are already using a charge state booster for the post acceleration of radioactive ions. Planned facilities like MAFF, SPES, SPIRAL II and EURISOL have identified the need of a breeding system because of the demand for highly charged ions for low energy experiments and because of the available budget and space. Therefore the exploration and optimization of existing charge state breeders is mandatory and is supported by the I3-EURONS project. Central part of the planed charge breeding experiments is the MAXEBIS [1]. The electron gun, the inner electrode structure and the collector of the MAXEBIS have been modified. The MAXEBIS is a cold source, the superconducting magnet can reach up to 5 T. The high current electron gun is based on a 2 mm IrCe cathode which can be driven to a maximum emission current density of about 95 A/cm. A new collector has been installed which can sustain 18 kW beam power. A small surface ion source has been designed, which will provide alkaline beams for the injection of the ions into the MAXEBIS. The full MAXEBIS set-up has been moved from Frankfurt to GSI, where the charge breeding measurements will be performed. The whole beamline is homed outside GSI at the Heckhalle.