Blar i forfatter "Varberg, Erik"

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    • Effect of permanent magnets on plasma confinement and ion beam generation in a double layer helicon plasma source 

      Varberg, Erik (Master thesis; Mastergradsoppgave, 2016-06-01)
      The work described in this thesis was carried out to investigate how additional permanent magnets (PM) could affect the confinement and ion beam generation in a plasma which expands from a helicon source. PMs added to a plasma source systems has been shown to provide an increased plasma confinement, but is not widely used. This inexpensive and cheap method of using PMs which does not require any ...

    • Effect of permanent magnets on plasma confinement and ion beam properties in a double layer helicon plasma source 

      Varberg, Erik; Fredriksen, Åshild (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-06-26)
      The work described in this article was carried out to investigate how permanent magnets (PM) affect the plasma confinement and ion beam properties in an inductively coupled plasma which expands from a helicon source. The cylindrical plasma device Njord has a 13 cm long and 20 cm wide stainless steel port connecting the source chamber and the diffusion chamber. The source chamber has an axial magnetic ...

    • Radar—CubeSat Transionospheric HF Propagation Observations: Suomi 100 Satellite and EISCAT HF Facility 

      Kallio, Esa; Kero, Antti; Harri, Ari-Matti; Kestilä, Antti; Aikio, Anita; Fontell, Mathias; Jarvinen, Riku; Kauristie, Kirsti; Knuuttila, Olli; Koskimaa, Petri; Loyala, Jauaries; Lukkari, Juha-Matti; Modabberian, Amin; Niittyniemi, Joonas; Rynö, Jouni; Vanhamäki, Heikki; Varberg, Erik (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-20)
      Radio waves provide a useful diagnostic tool to investigate the properties of the ionosphere because the ionosphere affects the transmission and properties of high frequency (HF) electromagnetic waves. We have conducted a transionospheric HF-propagation research campaign with a nanosatellite on a low-Earth polar orbit and the EISCAT HF transmitter facility in Tromsø, Norway, in December 2020. In ...

    • A Stimulated Emission Diagnostic Technique for Electron Temperature of the High Power Radio Wave Modified Ionosphere 

      Fu, Haiyang; Jiang, M. L.; Vierinen, Juha; Häggström, Ingemar; Rietveld, Michael T.; Varberg, Erik; Sato, Hiroatsu; Wu, Jiang; Scales, Wayne A.; Jin, Y. Q. (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-09)
      We report observations of stimulated electromagnetic emission (SEE) induced by high power high frequency (HF) radio waves near the third electron gyroharmonic (3urn:x-wiley:00948276:media:grl64672:grl64672-math-0022) at European Incoherent Scatter Radar (EISCAT). It is discovered that stimulated Brillouin scattering (SBS) spectrum behaves similarly as spectral ion lines of the incoherent scatter ...