Diagnostic techniques of minimum-B ECR ion source plasma instabilities
Toivanen, V., Bhaskar, B. S., Izotov, I. V., Koivisto, H., & Tarvainen, O. (2022). Diagnostic techniques of minimum-B ECR ion source plasma instabilities. Review of Scientific Instruments, 93(1), Article 013302. https://doi.org/10.1063/5.0075443
Published inReview of Scientific Instruments
© 2022 Author(s).
The performance of a minimum-B Electron Cyclotron Resonance Ion Source (ECRIS) is traditionally quantified by measuring the beam current and quality of the extracted ion beams of different charge state ions. The stability of the extracted ion beam currents has drawn more attention recently as the technology is pushing its limits toward higher ion charge states and beam intensities. The stability of the extracted beam is often compromised by plasma instabilities manifesting themselves as rapid oscillations of the beam currents in millisecond scale. This paper focuses on practical aspects of diagnostics techniques of the instabilities, showcases examples of instability-related diagnostics signals, and links them to the plasma physics of ECR ion sources. The reviewed techniques include time-resolved microwave emission diagnostics, bremsstrahlung measurements, direct measurement of electron and ion fluxes, measurement of the ion beam energy spread, and optical emission diagnostics. We list the advantages and disadvantages of each technique and outline the development needs of further diagnostics. Finally, we discuss the implications of the instabilities in both historical and forward-looking context of ECRIS development. ...
PublisherAmerican Institute of Physics
Publication in research information system
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Related funder(s)Academy of Finland
Funding program(s)Academy Project, AoF
Additional information about fundingThis work has been supported by the Academy of Finland Project funding (No. 315855) and the University of Grenoble Alpes under the EMERGENCE program. The data processing was supported by the Russian Science Foundation (Grant No. 19-12-00377).
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