A4 Article in conference proceedings
Empirical study of multidimensional Child-Langmuir law with plasma ion source extraction using round apertures (2022)
Kosonen, S. T., Kalvas, T., Tarvainen, O., & Toivanen, V. (2022). Empirical study of multidimensional Child-Langmuir law with plasma ion source extraction using round apertures. In ICIS2021 : 19th International Conference on Ion Sources (Article 012079). IOP Publishing. Journal of Physics : Conference Series, 2244. https://doi.org/10.1088/1742-6596/2244/1/012079
JYU authors or editors
Publication details
All authors or editors: Kosonen, S. T.; Kalvas, T.; Tarvainen, O.; Toivanen, V.
Parent publication: ICIS2021 : 19th International Conference on Ion Sources
Conference:
- International Conference on Ion Sources
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: 012079
Publisher: IOP Publishing
Publication country: United Kingdom
Publication language: English
DOI: https://doi.org/10.1088/1742-6596/2244/1/012079
Publication open access: Openly available
Publication channel open access: Open Access channel
Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/82325
Abstract
One dimensional Child-Langmuir (CL) law is commonly used in ion source physics to describe space charge limited ion extraction from the plasma. Recently 2D and 3D CL laws have been derived, but plasma ion extraction does not strictly meet the assumptions in these CL laws. Investigations on the applicability of the CL laws to ion source extraction were conducted using filament-driven ion source, measuring the beam currents as a function of extraction voltage. The experiments are complemented with simulations where IBSimu is used for studying the behaviour of plasma meniscus. Three different voltage regions were identified with low, moderate and high voltage. With moderate voltages the extracted beam current density shows signs of 3D CL law. The results indicate that for the total beam current CL laws are not valid but instead require collimation for the CL effects emerge.
Keywords: plasma physics; particle accelerators
Contributing organizations
Ministry reporting: Yes
VIRTA submission year: 2022
JUFO rating: 1
