Predictive fluid model for self-consistent description of inductive RF coupling in powerful negative hydrogen ion sources

  • RF-driven negative hydrogen ion sources are typically operated at low frequencies around 1 MHz, gas pressures around or below 1 Pa and large power densities up to 10 Wcm-3. Owing to these conditions as well as the current discharge geometries and antenna layouts, the RF power coupling is far from optimized, i.e. only a fraction η of the power delivered by the generator is absorbed by the plasma. This considerably limits the performance and reliability of RF-driven ion sources. To study the bidirectional RF power coupling a self-consistent fluid model is introduced. Taking into account the interplay between the nonlinear RF Lorentz force and the electron viscosity (usually neglected in state-of-the-art fluid models) a steady state solution is obtained, where the trends reflect the experimental data. Solutions calculated in hydrogen but with increased ion masses indicate that the latter are responsible for the systematically increased η, which is observed experimentally when deuteriumRF-driven negative hydrogen ion sources are typically operated at low frequencies around 1 MHz, gas pressures around or below 1 Pa and large power densities up to 10 Wcm-3. Owing to these conditions as well as the current discharge geometries and antenna layouts, the RF power coupling is far from optimized, i.e. only a fraction η of the power delivered by the generator is absorbed by the plasma. This considerably limits the performance and reliability of RF-driven ion sources. To study the bidirectional RF power coupling a self-consistent fluid model is introduced. Taking into account the interplay between the nonlinear RF Lorentz force and the electron viscosity (usually neglected in state-of-the-art fluid models) a steady state solution is obtained, where the trends reflect the experimental data. Solutions calculated in hydrogen but with increased ion masses indicate that the latter are responsible for the systematically increased η, which is observed experimentally when deuterium instead of hydrogen is used as feed gas.show moreshow less

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Metadaten
Author:Dominikus ZielkeORCiD, Stefan BriefiORCiD, Stiliyan Lishev, Ursel FantzORCiDGND
URN:urn:nbn:de:bvb:384-opus4-949964
Frontdoor URLhttps://opus.bibliothek.uni-augsburg.de/opus4/94996
ISSN:1742-6588OPAC
ISSN:1742-6596OPAC
Parent Title (English):Journal of Physics: Conference Series
Publisher:IOP Publishing
Place of publication:Bristol
Type:Article
Language:English
Date of first Publication:2022/04/01
Publishing Institution:Universität Augsburg
Release Date:2022/05/25
Volume:2244
Issue:1
First Page:012030
DOI:https://doi.org/10.1088/1742-6596/2244/1/012030
Institutes:Mathematisch-Naturwissenschaftlich-Technische Fakultät
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik
Mathematisch-Naturwissenschaftlich-Technische Fakultät / Institut für Physik / AG Experimentelle Plasmaphysik (EPP)
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):CC-BY 4.0: Creative Commons: Namensnennung (mit Print on Demand)