The electron cyclotron resonance ion source with arc-shaped coils concept
Koivisto, H., Suominen, P., Tarvainen, O., & Spädtke, P. (2012). The electron cyclotron resonance ion source with arc-shaped coils concept. Review of Scientific Instruments, 83 (2), 02A312. doi:10.1063/1.3662474
Published inReview of Scientific Instruments
© 2012 American Institute of Physics. Published in this repository with the kind permission of the publisher.
The main limitation to further improve the performance of ECR ion sources is set by the magnet technology related to the multipole magnet field used for the closed minimum-B structure. The JYFL ion source group has sought different approaches to improve the strength of the minimum-B structure required for the production of highly charged ion beams. It was found out that such a configuration can be realized with arc shaped coils. The first prototype, electron cyclotron resonance ion source with arc-shaped coils (ARC-ECRIS), was constructed and tested at JYFL in 2006. It was confirmed that such an ion source can be used for the production of highly charged ion beams. Regardless of several cost-driven compromises such as extraction mirror ratio of 1.05–1.2, microwave frequency of 6.4 GHz, and beam line with limited capacity, Ar4+ beam intensity of up to 2 μA was measured. Subsequent design study has shown that the ARC-ECRIS operating at the microwave frequency above 40 GHz could be constructed. This specific design would be based on NbTi-wires and it fulfills the experimental magnetic field scaling laws. In this article, the ARC-ECRIS concept and its potential applications will be described. ...