Testing the injection of ions in the CB-ECRIS at the Cyclotron Institute G. Tabacaru, D. P. May, and J. Saathoff One of the milestones in the upgrade project is the commissioning of the CB-ECRIS

* Charge Breeding Electron Cyclotron Resonance Ion Source . This ion source will be used to further ionize low charge-state (1 mainly) radioactive ions to higher charge-states (charge-breeding) for acceleration by the superconducting K500 cyclotron. The details about the CBECRIS can be found in the last progress report and in Ref. [1]. The frequency used to ignite the plasma was 14.5 GHz and the extraction voltage varied between 7 kV to 10 kV. The source was initially tested as a conventional ECR ion source by injecting neutral gases: oxygen and argon. After running for few weeks the source became unstable and was inoperable due to the appearance of a large and oscillating drain current. It was found that the insulator between the plasma chamber and the steel from the injection side coil had developed significant damage from a sparking track. After the insulator was removed and examined, it was replaced with one redesigned to have a longer path from high-voltage to ground. The source has since operated in a more stable fashion. Fig. 1 shows a scan for high charge-states for argon with low microwave power.