Abstract

An all-permanent-magnet, 6-GHz volume-type ECR ion source has been constructed and evaluated. This source employs a novel magnetic field configuration with an extended central flat region to form a large, on-axis, ECR volume. It can also be converted to a traditional minimum-5 source where the ECR zones are surfaces. Comparisons are made of the performance of the source when operated in both volume and surface modes. According to the preliminary results, the volume mode is superior in terms of ion beam intensities and charge-state distributions.

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