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Time evolution of the space-charge sheath in an rf hollow cathode
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
2008 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 100, no 6, 062020- p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2008. Vol. 100, no 6, 062020- p.
National Category
Physical Sciences Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-97237DOI: 10.1088/1742-6596/100/6/062020ISI: 000275655200216OAI: oai:DiVA.org:uu-97237DiVA: diva2:172079
Available from: 2008-05-07 Created: 2008-05-07 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Modelling and Applications of the Hollow Cathode Plasma
Open this publication in new window or tab >>Modelling and Applications of the Hollow Cathode Plasma
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents experimental and modelling research on atmospheric pressure hollow cathodes and hollow electrodes. Experiments with the hybrid hollow electrode activated discharge (H-HEAD), which is a combination of a hollow cathode and a microwave plasma source, is presented. The experiments show that this source is able to produce long plasma columns in air and nitrogen at atmospheric pressure and at very low gas flow rates. Measurements of the vibrational temperature of the nitrogen molecules are also presented in this thesis. The vibrational temperature is an indication of the electron temperature in the plasma, an important characteristic of the plasma. Modelling work on the hollow cathode at atmospheric pressure with fluid equations is also presented. It is shown that the inclusion of fast and secondary electrons, characteristic of the hollow cathode plasmas, increases the sheath width. The sheath width was found to be of the order of 100 μm. By modelling the plasma as highly collisional by using the drift-diffusion approximation, it was shown that the increase in sheath thickness was larger at lower pressures than at higher pressures. Still, the sheath width can be of the order of 100 μm. A pulsed atmospheric plasma in a hollow electrode geometry was also modelled by the drift-diffusion fluid equations, with the addition of the energy equation for electrons. Rate and transport coefficients for the electrons were calculated from the solution to the Boltzmann equation as functions of mean electron energy. The dynamics of the plasma at pulse rise time showed large electron density and mean energy peaks at the cathode ends, but also that these quantities were enhanced at the centre of the discharge, between the cathode plates.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2008. 87 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 433
Keyword
Engineering physics, hollow cathode, hybrid plasma, vibrational temperature, atmospheric pressure, fluid modelling, radio frequency, pulsed power, Teknisk fysik
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:uu:diva-8747 (URN)978-91-554-7206-1 (ISBN)
Public defence
2008-05-28, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:30 (English)
Opponent
Supervisors
Available from: 2008-05-07 Created: 2008-05-07 Last updated: 2010-04-23Bibliographically approved

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Söderström, DanielBaránková, HanaBárdos, Ladislav

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