Hydrogen plasma induced photoelectron emission from metal surfaces
Low temperature hydrogen plasmas are strong sources of vacuum ultraviolet
radiation. The properties of laboratory plasmas can be influenced by surface
processes induced by photons with their energies exceeding the surface work
function of the wall material.
In this work, the plasma induced photoelectron emission has been studied with different ion sources. The emission depends on the mechanical design of the plasma
device, plasma heating method and the discharge power (density). Parametric
studies include the quantifying of the emission from different metal surfaces,
commonly used as plasma facing materials in ion sources, as well as alkali metal
covered surfaces. Experimental studies suggest that low temperature hydrogen
plasma induced photoelectron emission from metal surfaces can reach an order
of magnitude of 1 A per kW of plasma heating power. Furthermore, the emission can increase 2–3.5 times when the metal surface is coated with a thin layer
of alkali metal reducing
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Publisher
University of JyväskyläISBN
978-951-39-7328-5ISSN Search the Publication Forum
0075-465XContains publications
- Artikkeli I: Laulainen, J., Kalvas, T., Koivisto, H., Komppula, J. and Tarvainen, O. (2015). Photoelectron emission from metal surfaces induced by VUV-emission of filament driven hydrogen arc discharge plasma. AIP Conference Proceedings, 1655, 020007. DOI: 10.1063/1.4916416
- Artikkeli II: Laulainen, J., Kalvas, T., Koivisto, H., Komppula, J., Kronholm, R., & Tarvainen, O. (2016). Photoelectron emission from metal surfaces induced by radiation emitted by a 14 GHz electron cyclotron resonance ion source. Review of Scientific Instruments, 87(2), Article 02A506. DOI: 10.1063/1.4935012
- Artikkeli III: Laulainen, J., Kalvas, T., Koivisto, H., Kronholm, R., Tarvainen, O., Aleiferis, S., & Svarnas, P. (2017). Photoelectron emission experiments with ECR-driven multi-dipolar negative ion plasma source. In D. Faircloth (Ed.), NIBS 2016 : Fifth International Symposium on Negative Ions, Beams and Sources (Article 020012). AIP Publishing. AIP Conference Proceedings, 1869. DOI: 10.1063/1.4995718
- Artikkeli IV: Laulainen, J., Aleiferis, S., Kalvas, T., Koivisto, H., Kronholm, R., & Tarvainen, O. (2017). Hydrogen plasma induced photoelectron emission from low work function cesium covered metal surfaces. Physics of Plasmas, 24(10), Article 103502. DOI: 10.1063/1.4998005
- Artikkeli V: Laulainen, J., Kalvas, T., Koivisto, H., Kronholm, R., & Tarvainen, O. (2018). Photoelectron emission induced by low temperature hydrogen plasmas. In J. Lettry, E. Mahner, B. Marsh, R. Pardo, & R. Scrivens (Eds.), Proceedings of the 17th International Conference on Ion Sources (Article 020001). AIP Publishing. AIP Conference Proceedings, 2011. DOI: 10.1063/1.5053243
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