A1 Journal article (refereed)
The biased disc of an electron cyclotron resonance ion source as a probe of instability-induced electron and ion losses (2019)

Tarvainen, O., Kronholm, R., Kalvas, T., Koivisto, H., Izotov, I., Skalyga, V., Toivanen, V., & Maunoury, L. (2019). The biased disc of an electron cyclotron resonance ion source as a probe of instability-induced electron and ion losses. Review of Scientific Instruments, 90(12), Article 123303. https://doi.org/10.1063/1.5126935

JYU authors or editors

Tarvainen, Olli
Kronholm, Risto
Kalvas, Taneli
Koivisto, Hannu
Toivanen, Ville

Publication details

All authors or editors: Tarvainen, O.; Kronholm, R.; Kalvas, T.; Koivisto, H.; Izotov, I.; Skalyga, V.; Toivanen, V.; Maunoury, L.

Conference:

International Conference on Ion Sources

Place and date of conference: Lanzhou, China, 1.-6.9.2019

Journal or series: Review of Scientific Instruments

ISSN: 0034-6748

eISSN: 1089-7623

Publication year: 2019

Volume: 90

Issue number: 12

Article number: 123303

Publisher: American Institute of Physics

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1063/1.5126935

Publication open access: Not open

Publication channel open access:

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/68053

Additional information: Contributed paper, published as part of the Proceedings of the 18th International Conference on Ion Sources, Lanzhou, China, September 2019.

Abstract

Electron Cyclotron Resonance Ion Source (ECRIS) plasmas are prone to kinetic instabilities resulting in loss of electron and ion confinement. It is demonstrated that the biased disk of an ECRIS can be used as a probe to quantify such instability-induced electron and ion losses occurring in less than 10 µs. The qualitative interpretation of the data is supported by the measurement of the energy spread of the extracted ion beams implying a transient plasma potential >1.5 kV during the instability. A parametric study of the electron losses combined with electron tracking simulations allows for estimating the fraction of electrons expelled in each instability event to be on the order of 10% of the total electron population.

Keywords: particle accelerators; cyclotrons; plasma physics

Fields of science: