Slit extraction and emittance results of a permanent magnet minimum-B quadrupole electron cyclotron resonance ion source
Kosonen, S., Kalvas, T., Koivisto, H., Tarvainen, O., & Toivanen, V. (2024). Slit extraction and emittance results of a permanent magnet minimum-B quadrupole electron cyclotron resonance ion source. Nuclear Instruments and Methods in Physics Research. Section B : Beam Interactions with Materials and Atoms, 546, Article 165147. https://doi.org/10.1016/j.nimb.2023.165147
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Nuclear Instruments and Methods in Physics Research. Section B : Beam Interactions with Materials and AtomsDate
2024Copyright
© 2024 the Authors
We present an experimental and simulation study of high charge state ion beams produced with a permanent magnet electron cyclotron resonance ion source (ECRIS) with minimum-B quadrupole magnetic field topology and slit extraction system. The unconventional topology generates fan-shaped plasma flux, favouring a rectangular aperture for beam extraction. We demonstrate successful low-energy transport of the slit beam, achieving up to 25 times higher beam currents compared to a round extraction aperture. Maximum beam intensities are 1.5 and 15 μA for argon 11+ and 9+, respectively. The results indicate microwave power-limited beam production. Emittance values are comparable to traditional ECRIS. Unlike in conventional ECRIS, the emittance increases monotonically with increasing charge state due to slit extraction, magnetic topology, and beam transport characteristics. The experimental transport efficiency for helium ranges from 32% to 50%, depending on the total beam current. The losses primarily occur due to the dipole magnet’s insufficient vertical aperture.
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ElsevierISSN Search the Publication Forum
0168-583XKeywords
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Research Council of FinlandFunding program(s)
Academy Project, AoFAdditional information about funding
This work has been supported by the Academy of Finland Project funding (N:o 315855).License
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