University of Jyväskylä | JYX Digital Repository

  • English  | Give feedback |
    • suomi
    • English
 
  • Login
JavaScript is disabled for your browser. Some features of this site may not work without it.
View Item 
  • JYX
  • Opinnäytteet
  • Väitöskirjat
  • View Item
JYX > Opinnäytteet > Väitöskirjat > View Item

Hydrogen plasma induced photoelectron emission from metal surfaces

Thumbnail
View/Open
13. Mb

Downloads:  
Show download detailsHide download details  
Published in
Research report / Department of Physics, University of Jyväskylä
Authors
Laulainen, Janne
Date
2018
Discipline
Fysiikka

 
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 the work function. The free electrons produced by the photoelectron emission can influence various plasma processes and especially the plasma sheath structure, which has been studied using a one-dimensional analytical model. ...
Publisher
University of Jyväskylä
ISBN
978-951-39-7328-5
ISSN Search the Publication Forum
0075-465X
Contains 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
Keywords
valosähköinen ilmiö ionilähteet low temperature hydrogen plasma photoelectron emission ion source plasmafysiikka plasma (kaasu)
URI

http://urn.fi/URN:ISBN:978-951-39-7328-5

Metadata
Show full item record
Collections
  • Väitöskirjat [3178]

Related items

Showing items with similar title or keywords.

  • VUV-diagnostics of low temperature hydrogen plasmas 

    Komppula, Jani (University of Jyväskylä, 2015)
  • Photoelectron emission induced by low temperature hydrogen plasmas 

    Laulainen, Janne; Kalvas, Taneli; Koivisto, Hannu; Kronholm, Risto; Tarvainen, Olli (AIP Publishing, 2018)
    Experimental results of low temperature hydrogen plasma induced photoelectron emission measurements comparing two different plasma heating methods are summarized. By exposing the samples to the vacuum ultraviolet radiation ...
  • Quasi-periodical kinetic instabilities in minimum-B confined plasma 

    Bhaskar, B. S.; Koivisto, H.; Tarvainen, O.; Thuillier, T.; Toivanen, V. (AIP Publishing, 2022)
    We present the results of an experimental investigation of quasi-periodical kinetic instabilities exhibited by magnetically confined electron cyclotron resonance heated plasmas. The instabilities were detected by measuring ...
  • Recent progress on the superconducting ion source VENUS 

    Benitez, J.Y.; Franzen, K.Y.; Hodgkinson, A.; Loew, T.; Lyneis, C.M.; Phair, L.; Saba, J.; Strohmeier, M.; Tarvainen, Olli (American Institute of Physics, 2012)
    The 28 GHz Ion Source VENUS (versatile ECR for nuclear science) is back in operation after the superconducting sextupole leads were repaired and a fourth cryocooler was added. VENUS serves as an R&D device to explore the ...
  • The electron cyclotron resonance ion source with arc-shaped coils concept 

    Koivisto, Hannu; Suominen, Pekka; Tarvainen, Olli; Spädtke, P. (American Institute of Physics, 2012)
    The main limitation to further improve the performance of ECR ion sources is set by the magnet technology related to the multipole magnet field used for the closed minimum-B structure. The JYFL ion source group has sought ...
  • Browse materials
  • Browse materials
  • Articles
  • Conferences and seminars
  • Electronic books
  • Historical maps
  • Journals
  • Tunes and musical notes
  • Photographs
  • Presentations and posters
  • Publication series
  • Research reports
  • Research data
  • Study materials
  • Theses

Browse

All of JYXCollection listBy Issue DateAuthorsSubjectsPublished inDepartmentDiscipline

My Account

Login

Statistics

View Usage Statistics
  • How to publish in JYX?
  • Self-archiving
  • Publish Your Thesis Online
  • Publishing Your Dissertation
  • Publication services

Open Science at the JYU
 
Data Protection Description

Accessibility Statement

Unless otherwise specified, publicly available JYX metadata (excluding abstracts) may be freely reused under the CC0 waiver.
Open Science Centre