Spectroscopic study of ion temperature in minimum-B ECRIS plasma
Kronholm, R., Kalvas, T., Koivisto, H., Laulainen, J., Marttinen, M., Sakildien, M., & Tarvainen, O. (2019). Spectroscopic study of ion temperature in minimum-B ECRIS plasma. Plasma Sources Science and Technology, 28(7), 075006. https://doi.org/10.1088/1361-6595/ab27a1
Published inPlasma Sources Science and Technology
© 2019 IOP Publishing Ltd.
Experimentally determined ion temperatures of different charge states and elements in minimum-B confined electron cyclotron resonance ion source (ECRIS) plasma are reported. It is demonstrated with optical emission spectroscopy, complemented by the energy spread measurements of the extracted ion beams, that the ion temperature in the JYFL 14 GHz ECRIS is 5–28 eV depending on the plasma species and charge state. The reported ion temperatures are an order of magnitude higher than previously deduced from indirect diagnostics and used in simulations, but agree with those reported for a quadrupole mirror fusion experiment. The diagnostics setup and data interpretation are discussed in detail to demonstrate adequate understanding of the line broadening mechanisms and instrumental effects, which justifies the use of the measured Doppler broadening of the emission lines to derive the corresponding ion temperature. The ion temperatures of the high charge state plasma of the minimum-B ECRIS are compared to those measured from low temperature singly charged microwave and arc discharge plasmas to exclude systematic errors. The ion temperatures in the minimum-B ECRIS plasmas are shown to increase with the charge state and injected microwave power whereas two-frequency heating and plasma instabilities have only a minor effect on them. Possible mechanisms causing the higher-than-expected ion temperatures are hypothesized and assessed based on the reported experimental data. Finally, the implications of the results are discussed, demonstrating the need for further experiments especially with charge breeder ECR ion sources, and experimental data on ion confinement times. ...
PublisherInstitute of Physics Publishing Ltd.
ISSN Search the Publication Forum0963-0252
Publication in research information system
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Related funder(s)Academy of Finland; European Commission
Funding program(s)Academy Project, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingThe project has received funding from the European Unionʼs Horizon 2020 research and innovation programme under grant agreement No. 654002 and the Academy of Finland under the Finnish Centre of Excellence Programme 2012–2017 (Nuclear and Accelerator Based Physics Research at JYFL, Project No. 213503) and the Academy of Finland Project funding (No. 315855).
Showing items with similar title or keywords.
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Measurement of the energy distribution of electrons escaping minimum-B ECR plasmas Izotov, Ivan; Tarvainen, Olli; Skalyga, Vadim; Mansfeld, Dmitry; Kalvas, Taneli; Koivisto, Hannu; Kronholm, Risto (IOP Publishing, 2018)The measurement of the electron energy distribution (EED) of electrons escaping axially from a minimum-B electron cyclotron resonance ion source (ECRIS) is reported. The experimental data were recorded with a room-temperature ...