Status of compact ECR ion source (Kei2-source)

The compact ECR ion source with a permanent magnet configuration (Kei2-source) has been developed at NIRS (National Institute of Radiological Sciences) for a new carbon therapy facility. The Kei2-source was designed for production of C4+ ions; its performance such as beam intensity and stability have already reached the medical requirement. Therefore, the prototype development of the source for medical use is almost finished. We have started a few studies on applications of the source. One is the production in the ECR plasma of fullerenes, modified with various atoms, for new materials. A second one is the production of multiply charged ion (not only carbon) for ion implantation. In this paper these basic experiments for modified fullerenes and production of multiply charged ions will be reported. (author)