A4 Article in conference proceedings
Measurement of ionization, charge exchange and ion confinement times in charge breeder ECR ion sources with short pulse 1+ injection of metal ions (2022)

Luntinen, M., Angot, J., Tarvainen, O., Toivanen, V., Thuillier, T., & Koivisto, H. (2022). Measurement of ionization, charge exchange and ion confinement times in charge breeder ECR ion sources with short pulse 1+ injection of metal ions. In ICIS2021 : 19th International Conference on Ion Sources (Article 012009). IOP Publishing. Journal of Physics : Conference Series, 2244. https://doi.org/10.1088/1742-6596/2244/1/012009

JYU authors or editors

Publication details

All authors or editors: Luntinen, Miha; Angot, Julien; Tarvainen, Olli; Toivanen, Ville; Thuillier, Thomas; Koivisto, Hannu

Parent publication: ICIS2021 : 19th International Conference on Ion Sources

Conference:

Place and date of conference: Online, 20.-24.9.2021

Journal or series: Journal of Physics : Conference Series

ISSN: 1742-6588

eISSN: 1742-6596

Publication year: 2022

Publication date: 01/04/2022

Number in series: 2244

Article number: 012009

Publisher: IOP Publishing

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1088/1742-6596/2244/1/012009

Research data link: https://dx.doi.org/10.6084/m9.figshare.14685432

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/81107

Additional information: Analysis code: https://github.com/misapema-jyfl/popTauPy

Abstract

The Consecutive Transients (CT) method is used for estimating the characteristic times of ionization, charge exchange and confinement within the plasma of a Charge Breeder Electron Cyclotron Resonance Ion Source (CB-ECRIS). The method reveals differences in the characteristic times between different source configurations, with K9+ charge breeding efficiencies of 8.9 % and 20.4 %, and allows qualitative explanation of the improved breeding efficiency. The increase in K9+ efficiency is accompanied by a decrease in ionization time for low charge states, a decrease of charge exchange time for high charge states, and an overall decrease of the ion confinement time, which increases non-linearly with the charge state. The charge exchange time exhibits a minimum near charge state K8+, indicating low neutral density near the plasma core. The CT-method yields a distribution of possible ne and (Ee) corresponding to the spatial distribution of different charge state ions. The results hint at a non-uniform plasma electron density and energy distribution as well as a nested-layer distribution for the ion populations — hot and dense plasma with high charge state ions near the plasma core.

Keywords: plasma physics; cyclotrons; ions

Free keywords: consecutive transients; ECRIS; plasma; highly charged plasma; characteristic times; plasma properties

Contributing organizations

Ministry reporting: Yes

VIRTA submission year: 2022

JUFO rating: 1