Application of a 3D Monte Carlo PIC code for modeling the particle extraction from negative ion sources

  • In the present work a validation for the plasma sheath and surface emission of negatively charged particles was carried out for the 3D Particle in Cell code ONIX . An optimization of the numerical parameters in the code was implemented to reduce the computational cost, allowing for series of parametric studies. Parametric series of simulations identified factors that influence the maximum extracted current density, the co-extracted electron current and the beam optics in a negative ion source for neutral beam injection. The extraction aperture geometry and the extraction potential were found to influence the meniscus formation and the beam optics. These parameters were modified in ONIX to fit those of the test facilities and for new configurations, in order to find modifications that lead to an improvement of the ion source performance. The measured higher co-extracted electron current in deuterium with respect to hydrogen was studied. The effect of the ion mass on the plasma dynamicsIn the present work a validation for the plasma sheath and surface emission of negatively charged particles was carried out for the 3D Particle in Cell code ONIX . An optimization of the numerical parameters in the code was implemented to reduce the computational cost, allowing for series of parametric studies. Parametric series of simulations identified factors that influence the maximum extracted current density, the co-extracted electron current and the beam optics in a negative ion source for neutral beam injection. The extraction aperture geometry and the extraction potential were found to influence the meniscus formation and the beam optics. These parameters were modified in ONIX to fit those of the test facilities and for new configurations, in order to find modifications that lead to an improvement of the ion source performance. The measured higher co-extracted electron current in deuterium with respect to hydrogen was studied. The effect of the ion mass on the plasma dynamics and its relation with the co-extracted electron current was analyzed. The effect of the magnetic field in the transport of electrons was evaluated. Variations of the magnetic field topology were explored and an optimal configuration for the reduction of the co-extracted electron current was found.show moreshow less

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Metadaten
Author:Ivar Mauricio Montellano Duran
URN:urn:nbn:de:bvb:384-opus4-676205
Frontdoor URLhttps://opus.bibliothek.uni-augsburg.de/opus4/67620
Advisor:Ursel Fantz
Type:Doctoral Thesis
Language:English
Publishing Institution:Universität Augsburg
Granting Institution:Universität Augsburg, Mathematisch-Naturwissenschaftlich-Technische Fakultät
Date of final exam:2019/10/04
Release Date:2020/01/14
GND-Keyword:Ionenquelle; Austrittsarbeit; Computersimulation; Plasmaphysik
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)