Optics improvements of the K500 axial injection line

Recent improvements in the K500 injection beam line optics have increased the injection efficiency into the K500 cyclotron and lead to record primary beam powers on the production target at the CCF (Coupled Cyclotron Facility). For example, consecutive improvements in the design of the electrostatic focusing system below the ECR ion source have gradually increased the beam brightness. Also, degradation of the beam brightness by field aberrations in the existing analyzing bending magnets has been identified and remedied. During this effort, the offline ECR source Artemis-B has been a key factor allowing in-depth R&D without reducing beam time for the CCF operation. In the beam studies, emphasis has been put toward systematic quantification of the beam brightness using Allison-type emittance scanners. Various improvements in the K500 injection beam line optics will be presented and discussed.