An ECR-Type Light Ion Source for the Karlsruhe Isochronous Cyclotron

An ion source for fully stripped light ions (12C6+ up to 20Ne10+) is under development. In the first stage of the source a plasma is created and in the second stage ionisation to high charge states takes place. The required high electron energy and density is achieved by microwave heating at electron cyclotron resonance (ECR) frequency in the magnetic field of two superconducting solenoids and an additional permanent hexapolar magnet. Currents up to several 100 nA at 26 MeV/N will be obtainable in the scattering chamber. A general description of the set-up with details of the magnetic field configuration and vacuum system will be given.